<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/sangenya/.cargo/registry/src/github.com-1ecc6299db9ec823/crossbeam-epoch-0.9.5/src/atomic.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>atomic.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
<link rel="alternate icon" type="image/png" href="../../favicon-16x16.png">
<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../../crossbeam_epoch/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img src="../../brush.svg" width="18" height="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img src="../../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1"> 1</span>
<span id="2"> 2</span>
<span id="3"> 3</span>
<span id="4"> 4</span>
<span id="5"> 5</span>
<span id="6"> 6</span>
<span id="7"> 7</span>
<span id="8"> 8</span>
<span id="9"> 9</span>
<span id="10"> 10</span>
<span id="11"> 11</span>
<span id="12"> 12</span>
<span id="13"> 13</span>
<span id="14"> 14</span>
<span id="15"> 15</span>
<span id="16"> 16</span>
<span id="17"> 17</span>
<span id="18"> 18</span>
<span id="19"> 19</span>
<span id="20"> 20</span>
<span id="21"> 21</span>
<span id="22"> 22</span>
<span id="23"> 23</span>
<span id="24"> 24</span>
<span id="25"> 25</span>
<span id="26"> 26</span>
<span id="27"> 27</span>
<span id="28"> 28</span>
<span id="29"> 29</span>
<span id="30"> 30</span>
<span id="31"> 31</span>
<span id="32"> 32</span>
<span id="33"> 33</span>
<span id="34"> 34</span>
<span id="35"> 35</span>
<span id="36"> 36</span>
<span id="37"> 37</span>
<span id="38"> 38</span>
<span id="39"> 39</span>
<span id="40"> 40</span>
<span id="41"> 41</span>
<span id="42"> 42</span>
<span id="43"> 43</span>
<span id="44"> 44</span>
<span id="45"> 45</span>
<span id="46"> 46</span>
<span id="47"> 47</span>
<span id="48"> 48</span>
<span id="49"> 49</span>
<span id="50"> 50</span>
<span id="51"> 51</span>
<span id="52"> 52</span>
<span id="53"> 53</span>
<span id="54"> 54</span>
<span id="55"> 55</span>
<span id="56"> 56</span>
<span id="57"> 57</span>
<span id="58"> 58</span>
<span id="59"> 59</span>
<span id="60"> 60</span>
<span id="61"> 61</span>
<span id="62"> 62</span>
<span id="63"> 63</span>
<span id="64"> 64</span>
<span id="65"> 65</span>
<span id="66"> 66</span>
<span id="67"> 67</span>
<span id="68"> 68</span>
<span id="69"> 69</span>
<span id="70"> 70</span>
<span id="71"> 71</span>
<span id="72"> 72</span>
<span id="73"> 73</span>
<span id="74"> 74</span>
<span id="75"> 75</span>
<span id="76"> 76</span>
<span id="77"> 77</span>
<span id="78"> 78</span>
<span id="79"> 79</span>
<span id="80"> 80</span>
<span id="81"> 81</span>
<span id="82"> 82</span>
<span id="83"> 83</span>
<span id="84"> 84</span>
<span id="85"> 85</span>
<span id="86"> 86</span>
<span id="87"> 87</span>
<span id="88"> 88</span>
<span id="89"> 89</span>
<span id="90"> 90</span>
<span id="91"> 91</span>
<span id="92"> 92</span>
<span id="93"> 93</span>
<span id="94"> 94</span>
<span id="95"> 95</span>
<span id="96"> 96</span>
<span id="97"> 97</span>
<span id="98"> 98</span>
<span id="99"> 99</span>
<span id="100"> 100</span>
<span id="101"> 101</span>
<span id="102"> 102</span>
<span id="103"> 103</span>
<span id="104"> 104</span>
<span id="105"> 105</span>
<span id="106"> 106</span>
<span id="107"> 107</span>
<span id="108"> 108</span>
<span id="109"> 109</span>
<span id="110"> 110</span>
<span id="111"> 111</span>
<span id="112"> 112</span>
<span id="113"> 113</span>
<span id="114"> 114</span>
<span id="115"> 115</span>
<span id="116"> 116</span>
<span id="117"> 117</span>
<span id="118"> 118</span>
<span id="119"> 119</span>
<span id="120"> 120</span>
<span id="121"> 121</span>
<span id="122"> 122</span>
<span id="123"> 123</span>
<span id="124"> 124</span>
<span id="125"> 125</span>
<span id="126"> 126</span>
<span id="127"> 127</span>
<span id="128"> 128</span>
<span id="129"> 129</span>
<span id="130"> 130</span>
<span id="131"> 131</span>
<span id="132"> 132</span>
<span id="133"> 133</span>
<span id="134"> 134</span>
<span id="135"> 135</span>
<span id="136"> 136</span>
<span id="137"> 137</span>
<span id="138"> 138</span>
<span id="139"> 139</span>
<span id="140"> 140</span>
<span id="141"> 141</span>
<span id="142"> 142</span>
<span id="143"> 143</span>
<span id="144"> 144</span>
<span id="145"> 145</span>
<span id="146"> 146</span>
<span id="147"> 147</span>
<span id="148"> 148</span>
<span id="149"> 149</span>
<span id="150"> 150</span>
<span id="151"> 151</span>
<span id="152"> 152</span>
<span id="153"> 153</span>
<span id="154"> 154</span>
<span id="155"> 155</span>
<span id="156"> 156</span>
<span id="157"> 157</span>
<span id="158"> 158</span>
<span id="159"> 159</span>
<span id="160"> 160</span>
<span id="161"> 161</span>
<span id="162"> 162</span>
<span id="163"> 163</span>
<span id="164"> 164</span>
<span id="165"> 165</span>
<span id="166"> 166</span>
<span id="167"> 167</span>
<span id="168"> 168</span>
<span id="169"> 169</span>
<span id="170"> 170</span>
<span id="171"> 171</span>
<span id="172"> 172</span>
<span id="173"> 173</span>
<span id="174"> 174</span>
<span id="175"> 175</span>
<span id="176"> 176</span>
<span id="177"> 177</span>
<span id="178"> 178</span>
<span id="179"> 179</span>
<span id="180"> 180</span>
<span id="181"> 181</span>
<span id="182"> 182</span>
<span id="183"> 183</span>
<span id="184"> 184</span>
<span id="185"> 185</span>
<span id="186"> 186</span>
<span id="187"> 187</span>
<span id="188"> 188</span>
<span id="189"> 189</span>
<span id="190"> 190</span>
<span id="191"> 191</span>
<span id="192"> 192</span>
<span id="193"> 193</span>
<span id="194"> 194</span>
<span id="195"> 195</span>
<span id="196"> 196</span>
<span id="197"> 197</span>
<span id="198"> 198</span>
<span id="199"> 199</span>
<span id="200"> 200</span>
<span id="201"> 201</span>
<span id="202"> 202</span>
<span id="203"> 203</span>
<span id="204"> 204</span>
<span id="205"> 205</span>
<span id="206"> 206</span>
<span id="207"> 207</span>
<span id="208"> 208</span>
<span id="209"> 209</span>
<span id="210"> 210</span>
<span id="211"> 211</span>
<span id="212"> 212</span>
<span id="213"> 213</span>
<span id="214"> 214</span>
<span id="215"> 215</span>
<span id="216"> 216</span>
<span id="217"> 217</span>
<span id="218"> 218</span>
<span id="219"> 219</span>
<span id="220"> 220</span>
<span id="221"> 221</span>
<span id="222"> 222</span>
<span id="223"> 223</span>
<span id="224"> 224</span>
<span id="225"> 225</span>
<span id="226"> 226</span>
<span id="227"> 227</span>
<span id="228"> 228</span>
<span id="229"> 229</span>
<span id="230"> 230</span>
<span id="231"> 231</span>
<span id="232"> 232</span>
<span id="233"> 233</span>
<span id="234"> 234</span>
<span id="235"> 235</span>
<span id="236"> 236</span>
<span id="237"> 237</span>
<span id="238"> 238</span>
<span id="239"> 239</span>
<span id="240"> 240</span>
<span id="241"> 241</span>
<span id="242"> 242</span>
<span id="243"> 243</span>
<span id="244"> 244</span>
<span id="245"> 245</span>
<span id="246"> 246</span>
<span id="247"> 247</span>
<span id="248"> 248</span>
<span id="249"> 249</span>
<span id="250"> 250</span>
<span id="251"> 251</span>
<span id="252"> 252</span>
<span id="253"> 253</span>
<span id="254"> 254</span>
<span id="255"> 255</span>
<span id="256"> 256</span>
<span id="257"> 257</span>
<span id="258"> 258</span>
<span id="259"> 259</span>
<span id="260"> 260</span>
<span id="261"> 261</span>
<span id="262"> 262</span>
<span id="263"> 263</span>
<span id="264"> 264</span>
<span id="265"> 265</span>
<span id="266"> 266</span>
<span id="267"> 267</span>
<span id="268"> 268</span>
<span id="269"> 269</span>
<span id="270"> 270</span>
<span id="271"> 271</span>
<span id="272"> 272</span>
<span id="273"> 273</span>
<span id="274"> 274</span>
<span id="275"> 275</span>
<span id="276"> 276</span>
<span id="277"> 277</span>
<span id="278"> 278</span>
<span id="279"> 279</span>
<span id="280"> 280</span>
<span id="281"> 281</span>
<span id="282"> 282</span>
<span id="283"> 283</span>
<span id="284"> 284</span>
<span id="285"> 285</span>
<span id="286"> 286</span>
<span id="287"> 287</span>
<span id="288"> 288</span>
<span id="289"> 289</span>
<span id="290"> 290</span>
<span id="291"> 291</span>
<span id="292"> 292</span>
<span id="293"> 293</span>
<span id="294"> 294</span>
<span id="295"> 295</span>
<span id="296"> 296</span>
<span id="297"> 297</span>
<span id="298"> 298</span>
<span id="299"> 299</span>
<span id="300"> 300</span>
<span id="301"> 301</span>
<span id="302"> 302</span>
<span id="303"> 303</span>
<span id="304"> 304</span>
<span id="305"> 305</span>
<span id="306"> 306</span>
<span id="307"> 307</span>
<span id="308"> 308</span>
<span id="309"> 309</span>
<span id="310"> 310</span>
<span id="311"> 311</span>
<span id="312"> 312</span>
<span id="313"> 313</span>
<span id="314"> 314</span>
<span id="315"> 315</span>
<span id="316"> 316</span>
<span id="317"> 317</span>
<span id="318"> 318</span>
<span id="319"> 319</span>
<span id="320"> 320</span>
<span id="321"> 321</span>
<span id="322"> 322</span>
<span id="323"> 323</span>
<span id="324"> 324</span>
<span id="325"> 325</span>
<span id="326"> 326</span>
<span id="327"> 327</span>
<span id="328"> 328</span>
<span id="329"> 329</span>
<span id="330"> 330</span>
<span id="331"> 331</span>
<span id="332"> 332</span>
<span id="333"> 333</span>
<span id="334"> 334</span>
<span id="335"> 335</span>
<span id="336"> 336</span>
<span id="337"> 337</span>
<span id="338"> 338</span>
<span id="339"> 339</span>
<span id="340"> 340</span>
<span id="341"> 341</span>
<span id="342"> 342</span>
<span id="343"> 343</span>
<span id="344"> 344</span>
<span id="345"> 345</span>
<span id="346"> 346</span>
<span id="347"> 347</span>
<span id="348"> 348</span>
<span id="349"> 349</span>
<span id="350"> 350</span>
<span id="351"> 351</span>
<span id="352"> 352</span>
<span id="353"> 353</span>
<span id="354"> 354</span>
<span id="355"> 355</span>
<span id="356"> 356</span>
<span id="357"> 357</span>
<span id="358"> 358</span>
<span id="359"> 359</span>
<span id="360"> 360</span>
<span id="361"> 361</span>
<span id="362"> 362</span>
<span id="363"> 363</span>
<span id="364"> 364</span>
<span id="365"> 365</span>
<span id="366"> 366</span>
<span id="367"> 367</span>
<span id="368"> 368</span>
<span id="369"> 369</span>
<span id="370"> 370</span>
<span id="371"> 371</span>
<span id="372"> 372</span>
<span id="373"> 373</span>
<span id="374"> 374</span>
<span id="375"> 375</span>
<span id="376"> 376</span>
<span id="377"> 377</span>
<span id="378"> 378</span>
<span id="379"> 379</span>
<span id="380"> 380</span>
<span id="381"> 381</span>
<span id="382"> 382</span>
<span id="383"> 383</span>
<span id="384"> 384</span>
<span id="385"> 385</span>
<span id="386"> 386</span>
<span id="387"> 387</span>
<span id="388"> 388</span>
<span id="389"> 389</span>
<span id="390"> 390</span>
<span id="391"> 391</span>
<span id="392"> 392</span>
<span id="393"> 393</span>
<span id="394"> 394</span>
<span id="395"> 395</span>
<span id="396"> 396</span>
<span id="397"> 397</span>
<span id="398"> 398</span>
<span id="399"> 399</span>
<span id="400"> 400</span>
<span id="401"> 401</span>
<span id="402"> 402</span>
<span id="403"> 403</span>
<span id="404"> 404</span>
<span id="405"> 405</span>
<span id="406"> 406</span>
<span id="407"> 407</span>
<span id="408"> 408</span>
<span id="409"> 409</span>
<span id="410"> 410</span>
<span id="411"> 411</span>
<span id="412"> 412</span>
<span id="413"> 413</span>
<span id="414"> 414</span>
<span id="415"> 415</span>
<span id="416"> 416</span>
<span id="417"> 417</span>
<span id="418"> 418</span>
<span id="419"> 419</span>
<span id="420"> 420</span>
<span id="421"> 421</span>
<span id="422"> 422</span>
<span id="423"> 423</span>
<span id="424"> 424</span>
<span id="425"> 425</span>
<span id="426"> 426</span>
<span id="427"> 427</span>
<span id="428"> 428</span>
<span id="429"> 429</span>
<span id="430"> 430</span>
<span id="431"> 431</span>
<span id="432"> 432</span>
<span id="433"> 433</span>
<span id="434"> 434</span>
<span id="435"> 435</span>
<span id="436"> 436</span>
<span id="437"> 437</span>
<span id="438"> 438</span>
<span id="439"> 439</span>
<span id="440"> 440</span>
<span id="441"> 441</span>
<span id="442"> 442</span>
<span id="443"> 443</span>
<span id="444"> 444</span>
<span id="445"> 445</span>
<span id="446"> 446</span>
<span id="447"> 447</span>
<span id="448"> 448</span>
<span id="449"> 449</span>
<span id="450"> 450</span>
<span id="451"> 451</span>
<span id="452"> 452</span>
<span id="453"> 453</span>
<span id="454"> 454</span>
<span id="455"> 455</span>
<span id="456"> 456</span>
<span id="457"> 457</span>
<span id="458"> 458</span>
<span id="459"> 459</span>
<span id="460"> 460</span>
<span id="461"> 461</span>
<span id="462"> 462</span>
<span id="463"> 463</span>
<span id="464"> 464</span>
<span id="465"> 465</span>
<span id="466"> 466</span>
<span id="467"> 467</span>
<span id="468"> 468</span>
<span id="469"> 469</span>
<span id="470"> 470</span>
<span id="471"> 471</span>
<span id="472"> 472</span>
<span id="473"> 473</span>
<span id="474"> 474</span>
<span id="475"> 475</span>
<span id="476"> 476</span>
<span id="477"> 477</span>
<span id="478"> 478</span>
<span id="479"> 479</span>
<span id="480"> 480</span>
<span id="481"> 481</span>
<span id="482"> 482</span>
<span id="483"> 483</span>
<span id="484"> 484</span>
<span id="485"> 485</span>
<span id="486"> 486</span>
<span id="487"> 487</span>
<span id="488"> 488</span>
<span id="489"> 489</span>
<span id="490"> 490</span>
<span id="491"> 491</span>
<span id="492"> 492</span>
<span id="493"> 493</span>
<span id="494"> 494</span>
<span id="495"> 495</span>
<span id="496"> 496</span>
<span id="497"> 497</span>
<span id="498"> 498</span>
<span id="499"> 499</span>
<span id="500"> 500</span>
<span id="501"> 501</span>
<span id="502"> 502</span>
<span id="503"> 503</span>
<span id="504"> 504</span>
<span id="505"> 505</span>
<span id="506"> 506</span>
<span id="507"> 507</span>
<span id="508"> 508</span>
<span id="509"> 509</span>
<span id="510"> 510</span>
<span id="511"> 511</span>
<span id="512"> 512</span>
<span id="513"> 513</span>
<span id="514"> 514</span>
<span id="515"> 515</span>
<span id="516"> 516</span>
<span id="517"> 517</span>
<span id="518"> 518</span>
<span id="519"> 519</span>
<span id="520"> 520</span>
<span id="521"> 521</span>
<span id="522"> 522</span>
<span id="523"> 523</span>
<span id="524"> 524</span>
<span id="525"> 525</span>
<span id="526"> 526</span>
<span id="527"> 527</span>
<span id="528"> 528</span>
<span id="529"> 529</span>
<span id="530"> 530</span>
<span id="531"> 531</span>
<span id="532"> 532</span>
<span id="533"> 533</span>
<span id="534"> 534</span>
<span id="535"> 535</span>
<span id="536"> 536</span>
<span id="537"> 537</span>
<span id="538"> 538</span>
<span id="539"> 539</span>
<span id="540"> 540</span>
<span id="541"> 541</span>
<span id="542"> 542</span>
<span id="543"> 543</span>
<span id="544"> 544</span>
<span id="545"> 545</span>
<span id="546"> 546</span>
<span id="547"> 547</span>
<span id="548"> 548</span>
<span id="549"> 549</span>
<span id="550"> 550</span>
<span id="551"> 551</span>
<span id="552"> 552</span>
<span id="553"> 553</span>
<span id="554"> 554</span>
<span id="555"> 555</span>
<span id="556"> 556</span>
<span id="557"> 557</span>
<span id="558"> 558</span>
<span id="559"> 559</span>
<span id="560"> 560</span>
<span id="561"> 561</span>
<span id="562"> 562</span>
<span id="563"> 563</span>
<span id="564"> 564</span>
<span id="565"> 565</span>
<span id="566"> 566</span>
<span id="567"> 567</span>
<span id="568"> 568</span>
<span id="569"> 569</span>
<span id="570"> 570</span>
<span id="571"> 571</span>
<span id="572"> 572</span>
<span id="573"> 573</span>
<span id="574"> 574</span>
<span id="575"> 575</span>
<span id="576"> 576</span>
<span id="577"> 577</span>
<span id="578"> 578</span>
<span id="579"> 579</span>
<span id="580"> 580</span>
<span id="581"> 581</span>
<span id="582"> 582</span>
<span id="583"> 583</span>
<span id="584"> 584</span>
<span id="585"> 585</span>
<span id="586"> 586</span>
<span id="587"> 587</span>
<span id="588"> 588</span>
<span id="589"> 589</span>
<span id="590"> 590</span>
<span id="591"> 591</span>
<span id="592"> 592</span>
<span id="593"> 593</span>
<span id="594"> 594</span>
<span id="595"> 595</span>
<span id="596"> 596</span>
<span id="597"> 597</span>
<span id="598"> 598</span>
<span id="599"> 599</span>
<span id="600"> 600</span>
<span id="601"> 601</span>
<span id="602"> 602</span>
<span id="603"> 603</span>
<span id="604"> 604</span>
<span id="605"> 605</span>
<span id="606"> 606</span>
<span id="607"> 607</span>
<span id="608"> 608</span>
<span id="609"> 609</span>
<span id="610"> 610</span>
<span id="611"> 611</span>
<span id="612"> 612</span>
<span id="613"> 613</span>
<span id="614"> 614</span>
<span id="615"> 615</span>
<span id="616"> 616</span>
<span id="617"> 617</span>
<span id="618"> 618</span>
<span id="619"> 619</span>
<span id="620"> 620</span>
<span id="621"> 621</span>
<span id="622"> 622</span>
<span id="623"> 623</span>
<span id="624"> 624</span>
<span id="625"> 625</span>
<span id="626"> 626</span>
<span id="627"> 627</span>
<span id="628"> 628</span>
<span id="629"> 629</span>
<span id="630"> 630</span>
<span id="631"> 631</span>
<span id="632"> 632</span>
<span id="633"> 633</span>
<span id="634"> 634</span>
<span id="635"> 635</span>
<span id="636"> 636</span>
<span id="637"> 637</span>
<span id="638"> 638</span>
<span id="639"> 639</span>
<span id="640"> 640</span>
<span id="641"> 641</span>
<span id="642"> 642</span>
<span id="643"> 643</span>
<span id="644"> 644</span>
<span id="645"> 645</span>
<span id="646"> 646</span>
<span id="647"> 647</span>
<span id="648"> 648</span>
<span id="649"> 649</span>
<span id="650"> 650</span>
<span id="651"> 651</span>
<span id="652"> 652</span>
<span id="653"> 653</span>
<span id="654"> 654</span>
<span id="655"> 655</span>
<span id="656"> 656</span>
<span id="657"> 657</span>
<span id="658"> 658</span>
<span id="659"> 659</span>
<span id="660"> 660</span>
<span id="661"> 661</span>
<span id="662"> 662</span>
<span id="663"> 663</span>
<span id="664"> 664</span>
<span id="665"> 665</span>
<span id="666"> 666</span>
<span id="667"> 667</span>
<span id="668"> 668</span>
<span id="669"> 669</span>
<span id="670"> 670</span>
<span id="671"> 671</span>
<span id="672"> 672</span>
<span id="673"> 673</span>
<span id="674"> 674</span>
<span id="675"> 675</span>
<span id="676"> 676</span>
<span id="677"> 677</span>
<span id="678"> 678</span>
<span id="679"> 679</span>
<span id="680"> 680</span>
<span id="681"> 681</span>
<span id="682"> 682</span>
<span id="683"> 683</span>
<span id="684"> 684</span>
<span id="685"> 685</span>
<span id="686"> 686</span>
<span id="687"> 687</span>
<span id="688"> 688</span>
<span id="689"> 689</span>
<span id="690"> 690</span>
<span id="691"> 691</span>
<span id="692"> 692</span>
<span id="693"> 693</span>
<span id="694"> 694</span>
<span id="695"> 695</span>
<span id="696"> 696</span>
<span id="697"> 697</span>
<span id="698"> 698</span>
<span id="699"> 699</span>
<span id="700"> 700</span>
<span id="701"> 701</span>
<span id="702"> 702</span>
<span id="703"> 703</span>
<span id="704"> 704</span>
<span id="705"> 705</span>
<span id="706"> 706</span>
<span id="707"> 707</span>
<span id="708"> 708</span>
<span id="709"> 709</span>
<span id="710"> 710</span>
<span id="711"> 711</span>
<span id="712"> 712</span>
<span id="713"> 713</span>
<span id="714"> 714</span>
<span id="715"> 715</span>
<span id="716"> 716</span>
<span id="717"> 717</span>
<span id="718"> 718</span>
<span id="719"> 719</span>
<span id="720"> 720</span>
<span id="721"> 721</span>
<span id="722"> 722</span>
<span id="723"> 723</span>
<span id="724"> 724</span>
<span id="725"> 725</span>
<span id="726"> 726</span>
<span id="727"> 727</span>
<span id="728"> 728</span>
<span id="729"> 729</span>
<span id="730"> 730</span>
<span id="731"> 731</span>
<span id="732"> 732</span>
<span id="733"> 733</span>
<span id="734"> 734</span>
<span id="735"> 735</span>
<span id="736"> 736</span>
<span id="737"> 737</span>
<span id="738"> 738</span>
<span id="739"> 739</span>
<span id="740"> 740</span>
<span id="741"> 741</span>
<span id="742"> 742</span>
<span id="743"> 743</span>
<span id="744"> 744</span>
<span id="745"> 745</span>
<span id="746"> 746</span>
<span id="747"> 747</span>
<span id="748"> 748</span>
<span id="749"> 749</span>
<span id="750"> 750</span>
<span id="751"> 751</span>
<span id="752"> 752</span>
<span id="753"> 753</span>
<span id="754"> 754</span>
<span id="755"> 755</span>
<span id="756"> 756</span>
<span id="757"> 757</span>
<span id="758"> 758</span>
<span id="759"> 759</span>
<span id="760"> 760</span>
<span id="761"> 761</span>
<span id="762"> 762</span>
<span id="763"> 763</span>
<span id="764"> 764</span>
<span id="765"> 765</span>
<span id="766"> 766</span>
<span id="767"> 767</span>
<span id="768"> 768</span>
<span id="769"> 769</span>
<span id="770"> 770</span>
<span id="771"> 771</span>
<span id="772"> 772</span>
<span id="773"> 773</span>
<span id="774"> 774</span>
<span id="775"> 775</span>
<span id="776"> 776</span>
<span id="777"> 777</span>
<span id="778"> 778</span>
<span id="779"> 779</span>
<span id="780"> 780</span>
<span id="781"> 781</span>
<span id="782"> 782</span>
<span id="783"> 783</span>
<span id="784"> 784</span>
<span id="785"> 785</span>
<span id="786"> 786</span>
<span id="787"> 787</span>
<span id="788"> 788</span>
<span id="789"> 789</span>
<span id="790"> 790</span>
<span id="791"> 791</span>
<span id="792"> 792</span>
<span id="793"> 793</span>
<span id="794"> 794</span>
<span id="795"> 795</span>
<span id="796"> 796</span>
<span id="797"> 797</span>
<span id="798"> 798</span>
<span id="799"> 799</span>
<span id="800"> 800</span>
<span id="801"> 801</span>
<span id="802"> 802</span>
<span id="803"> 803</span>
<span id="804"> 804</span>
<span id="805"> 805</span>
<span id="806"> 806</span>
<span id="807"> 807</span>
<span id="808"> 808</span>
<span id="809"> 809</span>
<span id="810"> 810</span>
<span id="811"> 811</span>
<span id="812"> 812</span>
<span id="813"> 813</span>
<span id="814"> 814</span>
<span id="815"> 815</span>
<span id="816"> 816</span>
<span id="817"> 817</span>
<span id="818"> 818</span>
<span id="819"> 819</span>
<span id="820"> 820</span>
<span id="821"> 821</span>
<span id="822"> 822</span>
<span id="823"> 823</span>
<span id="824"> 824</span>
<span id="825"> 825</span>
<span id="826"> 826</span>
<span id="827"> 827</span>
<span id="828"> 828</span>
<span id="829"> 829</span>
<span id="830"> 830</span>
<span id="831"> 831</span>
<span id="832"> 832</span>
<span id="833"> 833</span>
<span id="834"> 834</span>
<span id="835"> 835</span>
<span id="836"> 836</span>
<span id="837"> 837</span>
<span id="838"> 838</span>
<span id="839"> 839</span>
<span id="840"> 840</span>
<span id="841"> 841</span>
<span id="842"> 842</span>
<span id="843"> 843</span>
<span id="844"> 844</span>
<span id="845"> 845</span>
<span id="846"> 846</span>
<span id="847"> 847</span>
<span id="848"> 848</span>
<span id="849"> 849</span>
<span id="850"> 850</span>
<span id="851"> 851</span>
<span id="852"> 852</span>
<span id="853"> 853</span>
<span id="854"> 854</span>
<span id="855"> 855</span>
<span id="856"> 856</span>
<span id="857"> 857</span>
<span id="858"> 858</span>
<span id="859"> 859</span>
<span id="860"> 860</span>
<span id="861"> 861</span>
<span id="862"> 862</span>
<span id="863"> 863</span>
<span id="864"> 864</span>
<span id="865"> 865</span>
<span id="866"> 866</span>
<span id="867"> 867</span>
<span id="868"> 868</span>
<span id="869"> 869</span>
<span id="870"> 870</span>
<span id="871"> 871</span>
<span id="872"> 872</span>
<span id="873"> 873</span>
<span id="874"> 874</span>
<span id="875"> 875</span>
<span id="876"> 876</span>
<span id="877"> 877</span>
<span id="878"> 878</span>
<span id="879"> 879</span>
<span id="880"> 880</span>
<span id="881"> 881</span>
<span id="882"> 882</span>
<span id="883"> 883</span>
<span id="884"> 884</span>
<span id="885"> 885</span>
<span id="886"> 886</span>
<span id="887"> 887</span>
<span id="888"> 888</span>
<span id="889"> 889</span>
<span id="890"> 890</span>
<span id="891"> 891</span>
<span id="892"> 892</span>
<span id="893"> 893</span>
<span id="894"> 894</span>
<span id="895"> 895</span>
<span id="896"> 896</span>
<span id="897"> 897</span>
<span id="898"> 898</span>
<span id="899"> 899</span>
<span id="900"> 900</span>
<span id="901"> 901</span>
<span id="902"> 902</span>
<span id="903"> 903</span>
<span id="904"> 904</span>
<span id="905"> 905</span>
<span id="906"> 906</span>
<span id="907"> 907</span>
<span id="908"> 908</span>
<span id="909"> 909</span>
<span id="910"> 910</span>
<span id="911"> 911</span>
<span id="912"> 912</span>
<span id="913"> 913</span>
<span id="914"> 914</span>
<span id="915"> 915</span>
<span id="916"> 916</span>
<span id="917"> 917</span>
<span id="918"> 918</span>
<span id="919"> 919</span>
<span id="920"> 920</span>
<span id="921"> 921</span>
<span id="922"> 922</span>
<span id="923"> 923</span>
<span id="924"> 924</span>
<span id="925"> 925</span>
<span id="926"> 926</span>
<span id="927"> 927</span>
<span id="928"> 928</span>
<span id="929"> 929</span>
<span id="930"> 930</span>
<span id="931"> 931</span>
<span id="932"> 932</span>
<span id="933"> 933</span>
<span id="934"> 934</span>
<span id="935"> 935</span>
<span id="936"> 936</span>
<span id="937"> 937</span>
<span id="938"> 938</span>
<span id="939"> 939</span>
<span id="940"> 940</span>
<span id="941"> 941</span>
<span id="942"> 942</span>
<span id="943"> 943</span>
<span id="944"> 944</span>
<span id="945"> 945</span>
<span id="946"> 946</span>
<span id="947"> 947</span>
<span id="948"> 948</span>
<span id="949"> 949</span>
<span id="950"> 950</span>
<span id="951"> 951</span>
<span id="952"> 952</span>
<span id="953"> 953</span>
<span id="954"> 954</span>
<span id="955"> 955</span>
<span id="956"> 956</span>
<span id="957"> 957</span>
<span id="958"> 958</span>
<span id="959"> 959</span>
<span id="960"> 960</span>
<span id="961"> 961</span>
<span id="962"> 962</span>
<span id="963"> 963</span>
<span id="964"> 964</span>
<span id="965"> 965</span>
<span id="966"> 966</span>
<span id="967"> 967</span>
<span id="968"> 968</span>
<span id="969"> 969</span>
<span id="970"> 970</span>
<span id="971"> 971</span>
<span id="972"> 972</span>
<span id="973"> 973</span>
<span id="974"> 974</span>
<span id="975"> 975</span>
<span id="976"> 976</span>
<span id="977"> 977</span>
<span id="978"> 978</span>
<span id="979"> 979</span>
<span id="980"> 980</span>
<span id="981"> 981</span>
<span id="982"> 982</span>
<span id="983"> 983</span>
<span id="984"> 984</span>
<span id="985"> 985</span>
<span id="986"> 986</span>
<span id="987"> 987</span>
<span id="988"> 988</span>
<span id="989"> 989</span>
<span id="990"> 990</span>
<span id="991"> 991</span>
<span id="992"> 992</span>
<span id="993"> 993</span>
<span id="994"> 994</span>
<span id="995"> 995</span>
<span id="996"> 996</span>
<span id="997"> 997</span>
<span id="998"> 998</span>
<span id="999"> 999</span>
<span id="1000">1000</span>
<span id="1001">1001</span>
<span id="1002">1002</span>
<span id="1003">1003</span>
<span id="1004">1004</span>
<span id="1005">1005</span>
<span id="1006">1006</span>
<span id="1007">1007</span>
<span id="1008">1008</span>
<span id="1009">1009</span>
<span id="1010">1010</span>
<span id="1011">1011</span>
<span id="1012">1012</span>
<span id="1013">1013</span>
<span id="1014">1014</span>
<span id="1015">1015</span>
<span id="1016">1016</span>
<span id="1017">1017</span>
<span id="1018">1018</span>
<span id="1019">1019</span>
<span id="1020">1020</span>
<span id="1021">1021</span>
<span id="1022">1022</span>
<span id="1023">1023</span>
<span id="1024">1024</span>
<span id="1025">1025</span>
<span id="1026">1026</span>
<span id="1027">1027</span>
<span id="1028">1028</span>
<span id="1029">1029</span>
<span id="1030">1030</span>
<span id="1031">1031</span>
<span id="1032">1032</span>
<span id="1033">1033</span>
<span id="1034">1034</span>
<span id="1035">1035</span>
<span id="1036">1036</span>
<span id="1037">1037</span>
<span id="1038">1038</span>
<span id="1039">1039</span>
<span id="1040">1040</span>
<span id="1041">1041</span>
<span id="1042">1042</span>
<span id="1043">1043</span>
<span id="1044">1044</span>
<span id="1045">1045</span>
<span id="1046">1046</span>
<span id="1047">1047</span>
<span id="1048">1048</span>
<span id="1049">1049</span>
<span id="1050">1050</span>
<span id="1051">1051</span>
<span id="1052">1052</span>
<span id="1053">1053</span>
<span id="1054">1054</span>
<span id="1055">1055</span>
<span id="1056">1056</span>
<span id="1057">1057</span>
<span id="1058">1058</span>
<span id="1059">1059</span>
<span id="1060">1060</span>
<span id="1061">1061</span>
<span id="1062">1062</span>
<span id="1063">1063</span>
<span id="1064">1064</span>
<span id="1065">1065</span>
<span id="1066">1066</span>
<span id="1067">1067</span>
<span id="1068">1068</span>
<span id="1069">1069</span>
<span id="1070">1070</span>
<span id="1071">1071</span>
<span id="1072">1072</span>
<span id="1073">1073</span>
<span id="1074">1074</span>
<span id="1075">1075</span>
<span id="1076">1076</span>
<span id="1077">1077</span>
<span id="1078">1078</span>
<span id="1079">1079</span>
<span id="1080">1080</span>
<span id="1081">1081</span>
<span id="1082">1082</span>
<span id="1083">1083</span>
<span id="1084">1084</span>
<span id="1085">1085</span>
<span id="1086">1086</span>
<span id="1087">1087</span>
<span id="1088">1088</span>
<span id="1089">1089</span>
<span id="1090">1090</span>
<span id="1091">1091</span>
<span id="1092">1092</span>
<span id="1093">1093</span>
<span id="1094">1094</span>
<span id="1095">1095</span>
<span id="1096">1096</span>
<span id="1097">1097</span>
<span id="1098">1098</span>
<span id="1099">1099</span>
<span id="1100">1100</span>
<span id="1101">1101</span>
<span id="1102">1102</span>
<span id="1103">1103</span>
<span id="1104">1104</span>
<span id="1105">1105</span>
<span id="1106">1106</span>
<span id="1107">1107</span>
<span id="1108">1108</span>
<span id="1109">1109</span>
<span id="1110">1110</span>
<span id="1111">1111</span>
<span id="1112">1112</span>
<span id="1113">1113</span>
<span id="1114">1114</span>
<span id="1115">1115</span>
<span id="1116">1116</span>
<span id="1117">1117</span>
<span id="1118">1118</span>
<span id="1119">1119</span>
<span id="1120">1120</span>
<span id="1121">1121</span>
<span id="1122">1122</span>
<span id="1123">1123</span>
<span id="1124">1124</span>
<span id="1125">1125</span>
<span id="1126">1126</span>
<span id="1127">1127</span>
<span id="1128">1128</span>
<span id="1129">1129</span>
<span id="1130">1130</span>
<span id="1131">1131</span>
<span id="1132">1132</span>
<span id="1133">1133</span>
<span id="1134">1134</span>
<span id="1135">1135</span>
<span id="1136">1136</span>
<span id="1137">1137</span>
<span id="1138">1138</span>
<span id="1139">1139</span>
<span id="1140">1140</span>
<span id="1141">1141</span>
<span id="1142">1142</span>
<span id="1143">1143</span>
<span id="1144">1144</span>
<span id="1145">1145</span>
<span id="1146">1146</span>
<span id="1147">1147</span>
<span id="1148">1148</span>
<span id="1149">1149</span>
<span id="1150">1150</span>
<span id="1151">1151</span>
<span id="1152">1152</span>
<span id="1153">1153</span>
<span id="1154">1154</span>
<span id="1155">1155</span>
<span id="1156">1156</span>
<span id="1157">1157</span>
<span id="1158">1158</span>
<span id="1159">1159</span>
<span id="1160">1160</span>
<span id="1161">1161</span>
<span id="1162">1162</span>
<span id="1163">1163</span>
<span id="1164">1164</span>
<span id="1165">1165</span>
<span id="1166">1166</span>
<span id="1167">1167</span>
<span id="1168">1168</span>
<span id="1169">1169</span>
<span id="1170">1170</span>
<span id="1171">1171</span>
<span id="1172">1172</span>
<span id="1173">1173</span>
<span id="1174">1174</span>
<span id="1175">1175</span>
<span id="1176">1176</span>
<span id="1177">1177</span>
<span id="1178">1178</span>
<span id="1179">1179</span>
<span id="1180">1180</span>
<span id="1181">1181</span>
<span id="1182">1182</span>
<span id="1183">1183</span>
<span id="1184">1184</span>
<span id="1185">1185</span>
<span id="1186">1186</span>
<span id="1187">1187</span>
<span id="1188">1188</span>
<span id="1189">1189</span>
<span id="1190">1190</span>
<span id="1191">1191</span>
<span id="1192">1192</span>
<span id="1193">1193</span>
<span id="1194">1194</span>
<span id="1195">1195</span>
<span id="1196">1196</span>
<span id="1197">1197</span>
<span id="1198">1198</span>
<span id="1199">1199</span>
<span id="1200">1200</span>
<span id="1201">1201</span>
<span id="1202">1202</span>
<span id="1203">1203</span>
<span id="1204">1204</span>
<span id="1205">1205</span>
<span id="1206">1206</span>
<span id="1207">1207</span>
<span id="1208">1208</span>
<span id="1209">1209</span>
<span id="1210">1210</span>
<span id="1211">1211</span>
<span id="1212">1212</span>
<span id="1213">1213</span>
<span id="1214">1214</span>
<span id="1215">1215</span>
<span id="1216">1216</span>
<span id="1217">1217</span>
<span id="1218">1218</span>
<span id="1219">1219</span>
<span id="1220">1220</span>
<span id="1221">1221</span>
<span id="1222">1222</span>
<span id="1223">1223</span>
<span id="1224">1224</span>
<span id="1225">1225</span>
<span id="1226">1226</span>
<span id="1227">1227</span>
<span id="1228">1228</span>
<span id="1229">1229</span>
<span id="1230">1230</span>
<span id="1231">1231</span>
<span id="1232">1232</span>
<span id="1233">1233</span>
<span id="1234">1234</span>
<span id="1235">1235</span>
<span id="1236">1236</span>
<span id="1237">1237</span>
<span id="1238">1238</span>
<span id="1239">1239</span>
<span id="1240">1240</span>
<span id="1241">1241</span>
<span id="1242">1242</span>
<span id="1243">1243</span>
<span id="1244">1244</span>
<span id="1245">1245</span>
<span id="1246">1246</span>
<span id="1247">1247</span>
<span id="1248">1248</span>
<span id="1249">1249</span>
<span id="1250">1250</span>
<span id="1251">1251</span>
<span id="1252">1252</span>
<span id="1253">1253</span>
<span id="1254">1254</span>
<span id="1255">1255</span>
<span id="1256">1256</span>
<span id="1257">1257</span>
<span id="1258">1258</span>
<span id="1259">1259</span>
<span id="1260">1260</span>
<span id="1261">1261</span>
<span id="1262">1262</span>
<span id="1263">1263</span>
<span id="1264">1264</span>
<span id="1265">1265</span>
<span id="1266">1266</span>
<span id="1267">1267</span>
<span id="1268">1268</span>
<span id="1269">1269</span>
<span id="1270">1270</span>
<span id="1271">1271</span>
<span id="1272">1272</span>
<span id="1273">1273</span>
<span id="1274">1274</span>
<span id="1275">1275</span>
<span id="1276">1276</span>
<span id="1277">1277</span>
<span id="1278">1278</span>
<span id="1279">1279</span>
<span id="1280">1280</span>
<span id="1281">1281</span>
<span id="1282">1282</span>
<span id="1283">1283</span>
<span id="1284">1284</span>
<span id="1285">1285</span>
<span id="1286">1286</span>
<span id="1287">1287</span>
<span id="1288">1288</span>
<span id="1289">1289</span>
<span id="1290">1290</span>
<span id="1291">1291</span>
<span id="1292">1292</span>
<span id="1293">1293</span>
<span id="1294">1294</span>
<span id="1295">1295</span>
<span id="1296">1296</span>
<span id="1297">1297</span>
<span id="1298">1298</span>
<span id="1299">1299</span>
<span id="1300">1300</span>
<span id="1301">1301</span>
<span id="1302">1302</span>
<span id="1303">1303</span>
<span id="1304">1304</span>
<span id="1305">1305</span>
<span id="1306">1306</span>
<span id="1307">1307</span>
<span id="1308">1308</span>
<span id="1309">1309</span>
<span id="1310">1310</span>
<span id="1311">1311</span>
<span id="1312">1312</span>
<span id="1313">1313</span>
<span id="1314">1314</span>
<span id="1315">1315</span>
<span id="1316">1316</span>
<span id="1317">1317</span>
<span id="1318">1318</span>
<span id="1319">1319</span>
<span id="1320">1320</span>
<span id="1321">1321</span>
<span id="1322">1322</span>
<span id="1323">1323</span>
<span id="1324">1324</span>
<span id="1325">1325</span>
<span id="1326">1326</span>
<span id="1327">1327</span>
<span id="1328">1328</span>
<span id="1329">1329</span>
<span id="1330">1330</span>
<span id="1331">1331</span>
<span id="1332">1332</span>
<span id="1333">1333</span>
<span id="1334">1334</span>
<span id="1335">1335</span>
<span id="1336">1336</span>
<span id="1337">1337</span>
<span id="1338">1338</span>
<span id="1339">1339</span>
<span id="1340">1340</span>
<span id="1341">1341</span>
<span id="1342">1342</span>
<span id="1343">1343</span>
<span id="1344">1344</span>
<span id="1345">1345</span>
<span id="1346">1346</span>
<span id="1347">1347</span>
<span id="1348">1348</span>
<span id="1349">1349</span>
<span id="1350">1350</span>
<span id="1351">1351</span>
<span id="1352">1352</span>
<span id="1353">1353</span>
<span id="1354">1354</span>
<span id="1355">1355</span>
<span id="1356">1356</span>
<span id="1357">1357</span>
<span id="1358">1358</span>
<span id="1359">1359</span>
<span id="1360">1360</span>
<span id="1361">1361</span>
<span id="1362">1362</span>
<span id="1363">1363</span>
<span id="1364">1364</span>
<span id="1365">1365</span>
<span id="1366">1366</span>
<span id="1367">1367</span>
<span id="1368">1368</span>
<span id="1369">1369</span>
<span id="1370">1370</span>
<span id="1371">1371</span>
<span id="1372">1372</span>
<span id="1373">1373</span>
<span id="1374">1374</span>
<span id="1375">1375</span>
<span id="1376">1376</span>
<span id="1377">1377</span>
<span id="1378">1378</span>
<span id="1379">1379</span>
<span id="1380">1380</span>
<span id="1381">1381</span>
<span id="1382">1382</span>
<span id="1383">1383</span>
<span id="1384">1384</span>
<span id="1385">1385</span>
<span id="1386">1386</span>
<span id="1387">1387</span>
<span id="1388">1388</span>
<span id="1389">1389</span>
<span id="1390">1390</span>
<span id="1391">1391</span>
<span id="1392">1392</span>
<span id="1393">1393</span>
<span id="1394">1394</span>
<span id="1395">1395</span>
<span id="1396">1396</span>
<span id="1397">1397</span>
<span id="1398">1398</span>
<span id="1399">1399</span>
<span id="1400">1400</span>
<span id="1401">1401</span>
<span id="1402">1402</span>
<span id="1403">1403</span>
<span id="1404">1404</span>
<span id="1405">1405</span>
<span id="1406">1406</span>
<span id="1407">1407</span>
<span id="1408">1408</span>
<span id="1409">1409</span>
<span id="1410">1410</span>
<span id="1411">1411</span>
<span id="1412">1412</span>
<span id="1413">1413</span>
<span id="1414">1414</span>
<span id="1415">1415</span>
<span id="1416">1416</span>
<span id="1417">1417</span>
<span id="1418">1418</span>
<span id="1419">1419</span>
<span id="1420">1420</span>
<span id="1421">1421</span>
<span id="1422">1422</span>
<span id="1423">1423</span>
<span id="1424">1424</span>
<span id="1425">1425</span>
<span id="1426">1426</span>
<span id="1427">1427</span>
<span id="1428">1428</span>
<span id="1429">1429</span>
<span id="1430">1430</span>
<span id="1431">1431</span>
<span id="1432">1432</span>
<span id="1433">1433</span>
<span id="1434">1434</span>
<span id="1435">1435</span>
<span id="1436">1436</span>
<span id="1437">1437</span>
<span id="1438">1438</span>
<span id="1439">1439</span>
<span id="1440">1440</span>
<span id="1441">1441</span>
<span id="1442">1442</span>
<span id="1443">1443</span>
<span id="1444">1444</span>
<span id="1445">1445</span>
<span id="1446">1446</span>
<span id="1447">1447</span>
<span id="1448">1448</span>
<span id="1449">1449</span>
<span id="1450">1450</span>
<span id="1451">1451</span>
<span id="1452">1452</span>
<span id="1453">1453</span>
<span id="1454">1454</span>
<span id="1455">1455</span>
<span id="1456">1456</span>
<span id="1457">1457</span>
<span id="1458">1458</span>
<span id="1459">1459</span>
<span id="1460">1460</span>
<span id="1461">1461</span>
<span id="1462">1462</span>
<span id="1463">1463</span>
<span id="1464">1464</span>
<span id="1465">1465</span>
<span id="1466">1466</span>
<span id="1467">1467</span>
<span id="1468">1468</span>
<span id="1469">1469</span>
<span id="1470">1470</span>
<span id="1471">1471</span>
<span id="1472">1472</span>
<span id="1473">1473</span>
<span id="1474">1474</span>
<span id="1475">1475</span>
<span id="1476">1476</span>
<span id="1477">1477</span>
<span id="1478">1478</span>
<span id="1479">1479</span>
<span id="1480">1480</span>
<span id="1481">1481</span>
<span id="1482">1482</span>
<span id="1483">1483</span>
<span id="1484">1484</span>
<span id="1485">1485</span>
<span id="1486">1486</span>
<span id="1487">1487</span>
<span id="1488">1488</span>
<span id="1489">1489</span>
<span id="1490">1490</span>
<span id="1491">1491</span>
<span id="1492">1492</span>
<span id="1493">1493</span>
<span id="1494">1494</span>
<span id="1495">1495</span>
<span id="1496">1496</span>
<span id="1497">1497</span>
<span id="1498">1498</span>
<span id="1499">1499</span>
<span id="1500">1500</span>
<span id="1501">1501</span>
<span id="1502">1502</span>
<span id="1503">1503</span>
<span id="1504">1504</span>
<span id="1505">1505</span>
<span id="1506">1506</span>
<span id="1507">1507</span>
<span id="1508">1508</span>
<span id="1509">1509</span>
<span id="1510">1510</span>
<span id="1511">1511</span>
<span id="1512">1512</span>
<span id="1513">1513</span>
<span id="1514">1514</span>
<span id="1515">1515</span>
<span id="1516">1516</span>
<span id="1517">1517</span>
<span id="1518">1518</span>
<span id="1519">1519</span>
<span id="1520">1520</span>
<span id="1521">1521</span>
<span id="1522">1522</span>
<span id="1523">1523</span>
<span id="1524">1524</span>
<span id="1525">1525</span>
<span id="1526">1526</span>
<span id="1527">1527</span>
<span id="1528">1528</span>
<span id="1529">1529</span>
<span id="1530">1530</span>
<span id="1531">1531</span>
<span id="1532">1532</span>
<span id="1533">1533</span>
<span id="1534">1534</span>
<span id="1535">1535</span>
<span id="1536">1536</span>
<span id="1537">1537</span>
<span id="1538">1538</span>
<span id="1539">1539</span>
<span id="1540">1540</span>
<span id="1541">1541</span>
<span id="1542">1542</span>
<span id="1543">1543</span>
<span id="1544">1544</span>
<span id="1545">1545</span>
<span id="1546">1546</span>
<span id="1547">1547</span>
<span id="1548">1548</span>
<span id="1549">1549</span>
<span id="1550">1550</span>
<span id="1551">1551</span>
<span id="1552">1552</span>
<span id="1553">1553</span>
<span id="1554">1554</span>
<span id="1555">1555</span>
<span id="1556">1556</span>
<span id="1557">1557</span>
<span id="1558">1558</span>
<span id="1559">1559</span>
</pre><pre class="rust">
<span class="kw">use</span> <span class="ident">core::borrow</span>::{<span class="ident">Borrow</span>, <span class="ident">BorrowMut</span>};
<span class="kw">use</span> <span class="ident">core::cmp</span>;
<span class="kw">use</span> <span class="ident">core::fmt</span>;
<span class="kw">use</span> <span class="ident">core::marker::PhantomData</span>;
<span class="kw">use</span> <span class="ident">core::mem</span>::{<span class="self">self</span>, <span class="ident">MaybeUninit</span>};
<span class="kw">use</span> <span class="ident">core::ops</span>::{<span class="ident">Deref</span>, <span class="ident">DerefMut</span>};
<span class="kw">use</span> <span class="ident">core::slice</span>;
<span class="kw">use</span> <span class="ident">core::sync::atomic::Ordering</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::alloc::alloc</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::alloc::boxed::Box</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::guard::Guard</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::primitive::sync::atomic::AtomicUsize</span>;
<span class="kw">use</span> <span class="ident">crossbeam_utils::atomic::AtomicConsume</span>;
<span class="doccomment">/// Given ordering for the success case in a compare-exchange operation, returns the strongest</span>
<span class="doccomment">/// appropriate ordering for the failure case.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">strongest_failure_ordering</span>(<span class="ident">ord</span>: <span class="ident">Ordering</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span> {
<span class="kw">use</span> <span class="self">self</span><span class="ident">::Ordering</span>::<span class="kw-2">*</span>;
<span class="kw">match</span> <span class="ident">ord</span> {
<span class="ident">Relaxed</span> <span class="op">|</span> <span class="ident">Release</span> <span class="op">=</span><span class="op">></span> <span class="ident">Relaxed</span>,
<span class="ident">Acquire</span> <span class="op">|</span> <span class="ident">AcqRel</span> <span class="op">=</span><span class="op">></span> <span class="ident">Acquire</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="ident">SeqCst</span>,
}
}
<span class="doccomment">/// The error returned on failed compare-and-set operation.</span>
<span class="comment">// TODO: remove in the next major version.</span>
<span class="attribute">#[<span class="ident">deprecated</span>(<span class="ident">note</span> <span class="op">=</span> <span class="string">"Use `CompareExchangeError` instead"</span>)]</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">CompareAndSetError</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="op">=</span> <span class="ident">CompareExchangeError</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span>;
<span class="doccomment">/// The error returned on failed compare-and-swap operation.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CompareExchangeError</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span>, <span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> {
<span class="doccomment">/// The value in the atomic pointer at the time of the failed operation.</span>
<span class="kw">pub</span> <span class="ident">current</span>: <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span>,
<span class="doccomment">/// The new value, which the operation failed to store.</span>
<span class="kw">pub</span> <span class="ident">new</span>: <span class="ident">P</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="op">+</span> <span class="ident">fmt::Debug</span><span class="op">></span> <span class="ident">fmt::Debug</span> <span class="kw">for</span> <span class="ident">CompareExchangeError</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt::Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt::Result</span> {
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"CompareExchangeError"</span>)
.<span class="ident">field</span>(<span class="string">"current"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">current</span>)
.<span class="ident">field</span>(<span class="string">"new"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">new</span>)
.<span class="ident">finish</span>()
}
}
<span class="doccomment">/// Memory orderings for compare-and-set operations.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A compare-and-set operation can have different memory orderings depending on whether it</span>
<span class="doccomment">/// succeeds or fails. This trait generalizes different ways of specifying memory orderings.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The two ways of specifying orderings for compare-and-set are:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 1. Just one `Ordering` for the success case. In case of failure, the strongest appropriate</span>
<span class="doccomment">/// ordering is chosen.</span>
<span class="doccomment">/// 2. A pair of `Ordering`s. The first one is for the success case, while the second one is</span>
<span class="doccomment">/// for the failure case.</span>
<span class="comment">// TODO: remove in the next major version.</span>
<span class="attribute">#[<span class="ident">deprecated</span>(
<span class="ident">note</span> <span class="op">=</span> <span class="string">"`compare_and_set` and `compare_and_set_weak` that use this trait are deprecated, \
use `compare_exchange` or `compare_exchange_weak instead`"</span>
)]</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">CompareAndSetOrdering</span> {
<span class="doccomment">/// The ordering of the operation when it succeeds.</span>
<span class="kw">fn</span> <span class="ident">success</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span>;
<span class="doccomment">/// The ordering of the operation when it fails.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The failure ordering can't be `Release` or `AcqRel` and must be equivalent or weaker than</span>
<span class="doccomment">/// the success ordering.</span>
<span class="kw">fn</span> <span class="ident">failure</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span>;
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">impl</span> <span class="ident">CompareAndSetOrdering</span> <span class="kw">for</span> <span class="ident">Ordering</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">success</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span> {
<span class="kw-2">*</span><span class="self">self</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">failure</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span> {
<span class="ident">strongest_failure_ordering</span>(<span class="kw-2">*</span><span class="self">self</span>)
}
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">impl</span> <span class="ident">CompareAndSetOrdering</span> <span class="kw">for</span> (<span class="ident">Ordering</span>, <span class="ident">Ordering</span>) {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">success</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span> {
<span class="self">self</span>.<span class="number">0</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">failure</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span> {
<span class="self">self</span>.<span class="number">1</span>
}
}
<span class="doccomment">/// Returns a bitmask containing the unused least significant bits of an aligned pointer to `T`.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">low_bits</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span>() <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
(<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="ident">T::ALIGN</span>.<span class="ident">trailing_zeros</span>()) <span class="op">-</span> <span class="number">1</span>
}
<span class="doccomment">/// Panics if the pointer is not properly unaligned.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">ensure_aligned</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span>(<span class="ident">raw</span>: <span class="ident">usize</span>) {
<span class="macro">assert_eq!</span>(<span class="ident">raw</span> <span class="op">&</span> <span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(), <span class="number">0</span>, <span class="string">"unaligned pointer"</span>);
}
<span class="doccomment">/// Given a tagged pointer `data`, returns the same pointer, but tagged with `tag`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `tag` is truncated to fit into the unused bits of the pointer to `T`.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">compose_tag</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span>(<span class="ident">data</span>: <span class="ident">usize</span>, <span class="ident">tag</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
(<span class="ident">data</span> <span class="op">&</span> <span class="op">!</span><span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>()) <span class="op">|</span> (<span class="ident">tag</span> <span class="op">&</span> <span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>())
}
<span class="doccomment">/// Decomposes a tagged pointer `data` into the pointer and the tag.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">decompose_tag</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span>(<span class="ident">data</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">usize</span>, <span class="ident">usize</span>) {
(<span class="ident">data</span> <span class="op">&</span> <span class="op">!</span><span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(), <span class="ident">data</span> <span class="op">&</span> <span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>())
}
<span class="doccomment">/// Types that are pointed to by a single word.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In concurrent programming, it is necessary to represent an object within a word because atomic</span>
<span class="doccomment">/// operations (e.g., reads, writes, read-modify-writes) support only single words. This trait</span>
<span class="doccomment">/// qualifies such types that are pointed to by a single word.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The trait generalizes `Box<T>` for a sized type `T`. In a box, an object of type `T` is</span>
<span class="doccomment">/// allocated in heap and it is owned by a single-word pointer. This trait is also implemented for</span>
<span class="doccomment">/// `[MaybeUninit<T>]` by storing its size along with its elements and pointing to the pair of array</span>
<span class="doccomment">/// size and elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Pointers to `Pointable` types can be stored in [`Atomic`], [`Owned`], and [`Shared`]. In</span>
<span class="doccomment">/// particular, Crossbeam supports dynamically sized slices as follows.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::mem::MaybeUninit;</span>
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let o = Owned::<[MaybeUninit<i32>]>::init(10); // allocating [i32; 10]</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Pointable</span> {
<span class="doccomment">/// The alignment of pointer.</span>
<span class="kw">const</span> <span class="ident">ALIGN</span>: <span class="ident">usize</span>;
<span class="doccomment">/// The type for initializers.</span>
<span class="kw">type</span> <span class="ident">Init</span>;
<span class="doccomment">/// Initializes a with the given initializer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The result should be a multiple of `ALIGN`.</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">init</span>(<span class="ident">init</span>: <span class="self">Self</span><span class="ident">::Init</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span>;
<span class="doccomment">/// Dereferences the given pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - The given `ptr` should have been initialized with [`Pointable::init`].</span>
<span class="doccomment">/// - `ptr` should not have yet been dropped by [`Pointable::drop`].</span>
<span class="doccomment">/// - `ptr` should not be mutably dereferenced by [`Pointable::deref_mut`] concurrently.</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">deref</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">ptr</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">Self</span>;
<span class="doccomment">/// Mutably dereferences the given pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - The given `ptr` should have been initialized with [`Pointable::init`].</span>
<span class="doccomment">/// - `ptr` should not have yet been dropped by [`Pointable::drop`].</span>
<span class="doccomment">/// - `ptr` should not be dereferenced by [`Pointable::deref`] or [`Pointable::deref_mut`]</span>
<span class="doccomment">/// concurrently.</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">deref_mut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">ptr</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="self">Self</span>;
<span class="doccomment">/// Drops the object pointed to by the given pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - The given `ptr` should have been initialized with [`Pointable::init`].</span>
<span class="doccomment">/// - `ptr` should not have yet been dropped by [`Pointable::drop`].</span>
<span class="doccomment">/// - `ptr` should not be dereferenced by [`Pointable::deref`] or [`Pointable::deref_mut`]</span>
<span class="doccomment">/// concurrently.</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">drop</span>(<span class="ident">ptr</span>: <span class="ident">usize</span>);
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Pointable</span> <span class="kw">for</span> <span class="ident">T</span> {
<span class="kw">const</span> <span class="ident">ALIGN</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="ident">mem::align_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>();
<span class="kw">type</span> <span class="ident">Init</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">init</span>(<span class="ident">init</span>: <span class="self">Self</span><span class="ident">::Init</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="ident">Box::into_raw</span>(<span class="ident">Box::new</span>(<span class="ident">init</span>)) <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">deref</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">ptr</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">Self</span> {
<span class="kw-2">&</span><span class="kw-2">*</span>(<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>)
}
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">deref_mut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">ptr</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="self">Self</span> {
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>)
}
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">drop</span>(<span class="ident">ptr</span>: <span class="ident">usize</span>) {
<span class="ident">drop</span>(<span class="ident">Box::from_raw</span>(<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>));
}
}
<span class="doccomment">/// Array with size.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Memory layout</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An array consisting of size and elements:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```text</span>
<span class="doccomment">/// elements</span>
<span class="doccomment">/// |</span>
<span class="doccomment">/// |</span>
<span class="doccomment">/// ------------------------------------</span>
<span class="doccomment">/// | size | 0 | 1 | 2 | 3 | 4 | 5 | 6 |</span>
<span class="doccomment">/// ------------------------------------</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Its memory layout is different from that of `Box<[T]>` in that size is in the allocation (not</span>
<span class="doccomment">/// along with pointer as in `Box<[T]>`).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Elements are not present in the type, but they will be in the allocation.</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="comment">// TODO(@jeehoonkang): once we bump the minimum required Rust version to 1.44 or newer, use</span>
<span class="comment">// [`alloc::alloc::Layout::extend`] instead.</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="kw">struct</span> <span class="ident">Array</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// The number of elements (not the number of bytes).</span>
<span class="ident">len</span>: <span class="ident">usize</span>,
<span class="ident">elements</span>: [<span class="ident">MaybeUninit</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>; <span class="number">0</span>],
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Pointable</span> <span class="kw">for</span> [<span class="ident">MaybeUninit</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>] {
<span class="kw">const</span> <span class="ident">ALIGN</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="ident">mem::align_of</span>::<span class="op"><</span><span class="ident">Array</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>();
<span class="kw">type</span> <span class="ident">Init</span> <span class="op">=</span> <span class="ident">usize</span>;
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">init</span>(<span class="ident">len</span>: <span class="self">Self</span><span class="ident">::Init</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">mem::size_of</span>::<span class="op"><</span><span class="ident">Array</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>() <span class="op">+</span> <span class="ident">mem::size_of</span>::<span class="op"><</span><span class="ident">MaybeUninit</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>() <span class="op">*</span> <span class="ident">len</span>;
<span class="kw">let</span> <span class="ident">align</span> <span class="op">=</span> <span class="ident">mem::align_of</span>::<span class="op"><</span><span class="ident">Array</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">layout</span> <span class="op">=</span> <span class="ident">alloc::Layout::from_size_align</span>(<span class="ident">size</span>, <span class="ident">align</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">alloc::alloc</span>(<span class="ident">layout</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Array</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>;
<span class="kw">if</span> <span class="ident">ptr</span>.<span class="ident">is_null</span>() {
<span class="ident">alloc::handle_alloc_error</span>(<span class="ident">layout</span>);
}
(<span class="kw-2">*</span><span class="ident">ptr</span>).<span class="ident">len</span> <span class="op">=</span> <span class="ident">len</span>;
<span class="ident">ptr</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">deref</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">ptr</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">array</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span>(<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Array</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>);
<span class="ident">slice::from_raw_parts</span>(<span class="ident">array</span>.<span class="ident">elements</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span>, <span class="ident">array</span>.<span class="ident">len</span>)
}
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">deref_mut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">ptr</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">array</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span>(<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Array</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>);
<span class="ident">slice::from_raw_parts_mut</span>(<span class="ident">array</span>.<span class="ident">elements</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>, <span class="ident">array</span>.<span class="ident">len</span>)
}
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">drop</span>(<span class="ident">ptr</span>: <span class="ident">usize</span>) {
<span class="kw">let</span> <span class="ident">array</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span>(<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Array</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>);
<span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">mem::size_of</span>::<span class="op"><</span><span class="ident">Array</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>() <span class="op">+</span> <span class="ident">mem::size_of</span>::<span class="op"><</span><span class="ident">MaybeUninit</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>() <span class="op">*</span> <span class="ident">array</span>.<span class="ident">len</span>;
<span class="kw">let</span> <span class="ident">align</span> <span class="op">=</span> <span class="ident">mem::align_of</span>::<span class="op"><</span><span class="ident">Array</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">layout</span> <span class="op">=</span> <span class="ident">alloc::Layout::from_size_align</span>(<span class="ident">size</span>, <span class="ident">align</span>).<span class="ident">unwrap</span>();
<span class="ident">alloc::dealloc</span>(<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>, <span class="ident">layout</span>);
}
}
<span class="doccomment">/// An atomic pointer that can be safely shared between threads.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The pointer must be properly aligned. Since it is aligned, a tag can be stored into the unused</span>
<span class="doccomment">/// least significant bits of the address. For example, the tag for a pointer to a sized type `T`</span>
<span class="doccomment">/// should be less than `(1 << mem::align_of::<T>().trailing_zeros())`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Any method that loads the pointer must be passed a reference to a [`Guard`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Crossbeam supports dynamically sized types. See [`Pointable`] for details.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> {
<span class="ident">data</span>: <span class="ident">AtomicUsize</span>,
<span class="ident">_marker</span>: <span class="ident">PhantomData</span><span class="op"><</span><span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span>,
}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Allocates `value` on the heap and returns a new atomic pointer pointing to it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::Atomic;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(1234);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">init</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">Self</span><span class="ident">::init</span>(<span class="ident">init</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Allocates `value` on the heap and returns a new atomic pointer pointing to it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::Atomic;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::<i32>::init(1234);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">init</span>(<span class="ident">init</span>: <span class="ident">T::Init</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">Self</span><span class="ident">::from</span>(<span class="ident">Owned::init</span>(<span class="ident">init</span>))
}
<span class="doccomment">/// Returns a new atomic pointer pointing to the tagged pointer `data`.</span>
<span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">data</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span> {
<span class="ident">data</span>: <span class="ident">AtomicUsize::new</span>(<span class="ident">data</span>),
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
}
}
<span class="doccomment">/// Returns a new null atomic pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::Atomic;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::<i32>::null();</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"nightly"</span>, <span class="ident">not</span>(<span class="ident">crossbeam_loom</span>)), <span class="ident">const_fn::const_fn</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">null</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">Self</span> {
<span class="ident">data</span>: <span class="ident">AtomicUsize::new</span>(<span class="number">0</span>),
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
}
}
<span class="doccomment">/// Loads a `Shared` from the atomic pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method takes an [`Ordering`] argument which describes the memory ordering of this</span>
<span class="doccomment">/// operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(1234);</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load</span><span class="op"><</span><span class="lifetime">'g</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">ord</span>: <span class="ident">Ordering</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> { <span class="ident">Shared::from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">load</span>(<span class="ident">ord</span>)) }
}
<span class="doccomment">/// Loads a `Shared` from the atomic pointer using a "consume" memory ordering.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is similar to the "acquire" ordering, except that an ordering is</span>
<span class="doccomment">/// only guaranteed with operations that "depend on" the result of the load.</span>
<span class="doccomment">/// However consume loads are usually much faster than acquire loads on</span>
<span class="doccomment">/// architectures with a weak memory model since they don't require memory</span>
<span class="doccomment">/// fence instructions.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The exact definition of "depend on" is a bit vague, but it works as you</span>
<span class="doccomment">/// would expect in practice since a lot of software, especially the Linux</span>
<span class="doccomment">/// kernel, rely on this behavior.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(1234);</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// let p = a.load_consume(guard);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load_consume</span><span class="op"><</span><span class="lifetime">'g</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> { <span class="ident">Shared::from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">load_consume</span>()) }
}
<span class="doccomment">/// Stores a `Shared` or `Owned` pointer into the atomic pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method takes an [`Ordering`] argument which describes the memory ordering of this</span>
<span class="doccomment">/// operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{Atomic, Owned, Shared};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(1234);</span>
<span class="doccomment">/// a.store(Shared::null(), SeqCst);</span>
<span class="doccomment">/// a.store(Owned::new(1234), SeqCst);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">store</span><span class="op"><</span><span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">new</span>: <span class="ident">P</span>, <span class="ident">ord</span>: <span class="ident">Ordering</span>) {
<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">store</span>(<span class="ident">new</span>.<span class="ident">into_usize</span>(), <span class="ident">ord</span>);
}
<span class="doccomment">/// Stores a `Shared` or `Owned` pointer into the atomic pointer, returning the previous</span>
<span class="doccomment">/// `Shared`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method takes an [`Ordering`] argument which describes the memory ordering of this</span>
<span class="doccomment">/// operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Shared};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(1234);</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// let p = a.swap(Shared::null(), SeqCst, guard);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">new</span>: <span class="ident">P</span>, <span class="ident">ord</span>: <span class="ident">Ordering</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> { <span class="ident">Shared::from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">swap</span>(<span class="ident">new</span>.<span class="ident">into_usize</span>(), <span class="ident">ord</span>)) }
}
<span class="doccomment">/// Stores the pointer `new` (either `Shared` or `Owned`) into the atomic pointer if the current</span>
<span class="doccomment">/// value is the same as `current`. The tag is also taken into account, so two pointers to the</span>
<span class="doccomment">/// same object, but with different tags, will not be considered equal.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The return value is a result indicating whether the new pointer was written. On success the</span>
<span class="doccomment">/// pointer that was written is returned. On failure the actual current value and `new` are</span>
<span class="doccomment">/// returned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method takes two `Ordering` arguments to describe the memory</span>
<span class="doccomment">/// ordering of this operation. `success` describes the required ordering for the</span>
<span class="doccomment">/// read-modify-write operation that takes place if the comparison with `current` succeeds.</span>
<span class="doccomment">/// `failure` describes the required ordering for the load operation that takes place when</span>
<span class="doccomment">/// the comparison fails. Using `Acquire` as success ordering makes the store part</span>
<span class="doccomment">/// of this operation `Relaxed`, and using `Release` makes the successful load</span>
<span class="doccomment">/// `Relaxed`. The failure ordering can only be `SeqCst`, `Acquire` or `Relaxed`</span>
<span class="doccomment">/// and must be equivalent to or weaker than the success ordering.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned, Shared};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(1234);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// let curr = a.load(SeqCst, guard);</span>
<span class="doccomment">/// let res1 = a.compare_exchange(curr, Shared::null(), SeqCst, SeqCst, guard);</span>
<span class="doccomment">/// let res2 = a.compare_exchange(curr, Owned::new(5678), SeqCst, SeqCst, guard);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_exchange</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">P</span><span class="op">></span>(
<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">current</span>: <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span>,
<span class="ident">new</span>: <span class="ident">P</span>,
<span class="ident">success</span>: <span class="ident">Ordering</span>,
<span class="ident">failure</span>: <span class="ident">Ordering</span>,
<span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>,
) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">CompareExchangeError</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="ident">new</span> <span class="op">=</span> <span class="ident">new</span>.<span class="ident">into_usize</span>();
<span class="self">self</span>.<span class="ident">data</span>
.<span class="ident">compare_exchange</span>(<span class="ident">current</span>.<span class="ident">into_usize</span>(), <span class="ident">new</span>, <span class="ident">success</span>, <span class="ident">failure</span>)
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">Shared::from_usize</span>(<span class="ident">new</span>) })
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">current</span><span class="op">|</span> <span class="kw">unsafe</span> {
<span class="ident">CompareExchangeError</span> {
<span class="ident">current</span>: <span class="ident">Shared::from_usize</span>(<span class="ident">current</span>),
<span class="ident">new</span>: <span class="ident">P::from_usize</span>(<span class="ident">new</span>),
}
})
}
<span class="doccomment">/// Stores the pointer `new` (either `Shared` or `Owned`) into the atomic pointer if the current</span>
<span class="doccomment">/// value is the same as `current`. The tag is also taken into account, so two pointers to the</span>
<span class="doccomment">/// same object, but with different tags, will not be considered equal.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Unlike [`compare_exchange`], this method is allowed to spuriously fail even when comparison</span>
<span class="doccomment">/// succeeds, which can result in more efficient code on some platforms. The return value is a</span>
<span class="doccomment">/// result indicating whether the new pointer was written. On success the pointer that was</span>
<span class="doccomment">/// written is returned. On failure the actual current value and `new` are returned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method takes two `Ordering` arguments to describe the memory</span>
<span class="doccomment">/// ordering of this operation. `success` describes the required ordering for the</span>
<span class="doccomment">/// read-modify-write operation that takes place if the comparison with `current` succeeds.</span>
<span class="doccomment">/// `failure` describes the required ordering for the load operation that takes place when</span>
<span class="doccomment">/// the comparison fails. Using `Acquire` as success ordering makes the store part</span>
<span class="doccomment">/// of this operation `Relaxed`, and using `Release` makes the successful load</span>
<span class="doccomment">/// `Relaxed`. The failure ordering can only be `SeqCst`, `Acquire` or `Relaxed`</span>
<span class="doccomment">/// and must be equivalent to or weaker than the success ordering.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`compare_exchange`]: Atomic::compare_exchange</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned, Shared};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(1234);</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut new = Owned::new(5678);</span>
<span class="doccomment">/// let mut ptr = a.load(SeqCst, guard);</span>
<span class="doccomment">/// loop {</span>
<span class="doccomment">/// match a.compare_exchange_weak(ptr, new, SeqCst, SeqCst, guard) {</span>
<span class="doccomment">/// Ok(p) => {</span>
<span class="doccomment">/// ptr = p;</span>
<span class="doccomment">/// break;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// Err(err) => {</span>
<span class="doccomment">/// ptr = err.current;</span>
<span class="doccomment">/// new = err.new;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut curr = a.load(SeqCst, guard);</span>
<span class="doccomment">/// loop {</span>
<span class="doccomment">/// match a.compare_exchange_weak(curr, Shared::null(), SeqCst, SeqCst, guard) {</span>
<span class="doccomment">/// Ok(_) => break,</span>
<span class="doccomment">/// Err(err) => curr = err.current,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_exchange_weak</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">P</span><span class="op">></span>(
<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">current</span>: <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span>,
<span class="ident">new</span>: <span class="ident">P</span>,
<span class="ident">success</span>: <span class="ident">Ordering</span>,
<span class="ident">failure</span>: <span class="ident">Ordering</span>,
<span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>,
) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">CompareExchangeError</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="ident">new</span> <span class="op">=</span> <span class="ident">new</span>.<span class="ident">into_usize</span>();
<span class="self">self</span>.<span class="ident">data</span>
.<span class="ident">compare_exchange_weak</span>(<span class="ident">current</span>.<span class="ident">into_usize</span>(), <span class="ident">new</span>, <span class="ident">success</span>, <span class="ident">failure</span>)
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">Shared::from_usize</span>(<span class="ident">new</span>) })
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">current</span><span class="op">|</span> <span class="kw">unsafe</span> {
<span class="ident">CompareExchangeError</span> {
<span class="ident">current</span>: <span class="ident">Shared::from_usize</span>(<span class="ident">current</span>),
<span class="ident">new</span>: <span class="ident">P::from_usize</span>(<span class="ident">new</span>),
}
})
}
<span class="doccomment">/// Stores the pointer `new` (either `Shared` or `Owned`) into the atomic pointer if the current</span>
<span class="doccomment">/// value is the same as `current`. The tag is also taken into account, so two pointers to the</span>
<span class="doccomment">/// same object, but with different tags, will not be considered equal.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The return value is a result indicating whether the new pointer was written. On success the</span>
<span class="doccomment">/// pointer that was written is returned. On failure the actual current value and `new` are</span>
<span class="doccomment">/// returned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method takes a [`CompareAndSetOrdering`] argument which describes the memory</span>
<span class="doccomment">/// ordering of this operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Migrating to `compare_exchange`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `compare_and_set` is equivalent to `compare_exchange` with the following mapping for</span>
<span class="doccomment">/// memory orderings:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Original | Success | Failure</span>
<span class="doccomment">/// -------- | ------- | -------</span>
<span class="doccomment">/// Relaxed | Relaxed | Relaxed</span>
<span class="doccomment">/// Acquire | Acquire | Acquire</span>
<span class="doccomment">/// Release | Release | Relaxed</span>
<span class="doccomment">/// AcqRel | AcqRel | Acquire</span>
<span class="doccomment">/// SeqCst | SeqCst | SeqCst</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #![allow(deprecated)]</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned, Shared};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(1234);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// let curr = a.load(SeqCst, guard);</span>
<span class="doccomment">/// let res1 = a.compare_and_set(curr, Shared::null(), SeqCst, guard);</span>
<span class="doccomment">/// let res2 = a.compare_and_set(curr, Owned::new(5678), SeqCst, guard);</span>
<span class="doccomment">/// ```</span>
<span class="comment">// TODO: remove in the next major version.</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="attribute">#[<span class="ident">deprecated</span>(<span class="ident">note</span> <span class="op">=</span> <span class="string">"Use `compare_exchange` instead"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_and_set</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">O</span>, <span class="ident">P</span><span class="op">></span>(
<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">current</span>: <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span>,
<span class="ident">new</span>: <span class="ident">P</span>,
<span class="ident">ord</span>: <span class="ident">O</span>,
<span class="ident">guard</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>,
) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">CompareAndSetError</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">O</span>: <span class="ident">CompareAndSetOrdering</span>,
<span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
{
<span class="self">self</span>.<span class="ident">compare_exchange</span>(<span class="ident">current</span>, <span class="ident">new</span>, <span class="ident">ord</span>.<span class="ident">success</span>(), <span class="ident">ord</span>.<span class="ident">failure</span>(), <span class="ident">guard</span>)
}
<span class="doccomment">/// Stores the pointer `new` (either `Shared` or `Owned`) into the atomic pointer if the current</span>
<span class="doccomment">/// value is the same as `current`. The tag is also taken into account, so two pointers to the</span>
<span class="doccomment">/// same object, but with different tags, will not be considered equal.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Unlike [`compare_and_set`], this method is allowed to spuriously fail even when comparison</span>
<span class="doccomment">/// succeeds, which can result in more efficient code on some platforms. The return value is a</span>
<span class="doccomment">/// result indicating whether the new pointer was written. On success the pointer that was</span>
<span class="doccomment">/// written is returned. On failure the actual current value and `new` are returned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method takes a [`CompareAndSetOrdering`] argument which describes the memory</span>
<span class="doccomment">/// ordering of this operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`compare_and_set`]: Atomic::compare_and_set</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Migrating to `compare_exchange_weak`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `compare_and_set_weak` is equivalent to `compare_exchange_weak` with the following mapping for</span>
<span class="doccomment">/// memory orderings:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Original | Success | Failure</span>
<span class="doccomment">/// -------- | ------- | -------</span>
<span class="doccomment">/// Relaxed | Relaxed | Relaxed</span>
<span class="doccomment">/// Acquire | Acquire | Acquire</span>
<span class="doccomment">/// Release | Release | Relaxed</span>
<span class="doccomment">/// AcqRel | AcqRel | Acquire</span>
<span class="doccomment">/// SeqCst | SeqCst | SeqCst</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #![allow(deprecated)]</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned, Shared};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(1234);</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut new = Owned::new(5678);</span>
<span class="doccomment">/// let mut ptr = a.load(SeqCst, guard);</span>
<span class="doccomment">/// loop {</span>
<span class="doccomment">/// match a.compare_and_set_weak(ptr, new, SeqCst, guard) {</span>
<span class="doccomment">/// Ok(p) => {</span>
<span class="doccomment">/// ptr = p;</span>
<span class="doccomment">/// break;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// Err(err) => {</span>
<span class="doccomment">/// ptr = err.current;</span>
<span class="doccomment">/// new = err.new;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut curr = a.load(SeqCst, guard);</span>
<span class="doccomment">/// loop {</span>
<span class="doccomment">/// match a.compare_and_set_weak(curr, Shared::null(), SeqCst, guard) {</span>
<span class="doccomment">/// Ok(_) => break,</span>
<span class="doccomment">/// Err(err) => curr = err.current,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="comment">// TODO: remove in the next major version.</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="attribute">#[<span class="ident">deprecated</span>(<span class="ident">note</span> <span class="op">=</span> <span class="string">"Use `compare_exchange_weak` instead"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_and_set_weak</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">O</span>, <span class="ident">P</span><span class="op">></span>(
<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">current</span>: <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span>,
<span class="ident">new</span>: <span class="ident">P</span>,
<span class="ident">ord</span>: <span class="ident">O</span>,
<span class="ident">guard</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>,
) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">CompareAndSetError</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">O</span>: <span class="ident">CompareAndSetOrdering</span>,
<span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
{
<span class="self">self</span>.<span class="ident">compare_exchange_weak</span>(<span class="ident">current</span>, <span class="ident">new</span>, <span class="ident">ord</span>.<span class="ident">success</span>(), <span class="ident">ord</span>.<span class="ident">failure</span>(), <span class="ident">guard</span>)
}
<span class="doccomment">/// Bitwise "and" with the current tag.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Performs a bitwise "and" operation on the current tag and the argument `val`, and sets the</span>
<span class="doccomment">/// new tag to the result. Returns the previous pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method takes an [`Ordering`] argument which describes the memory ordering of this</span>
<span class="doccomment">/// operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Shared};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::<i32>::from(Shared::null().with_tag(3));</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// assert_eq!(a.fetch_and(2, SeqCst, guard).tag(), 3);</span>
<span class="doccomment">/// assert_eq!(a.load(SeqCst, guard).tag(), 2);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_and</span><span class="op"><</span><span class="lifetime">'g</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">usize</span>, <span class="ident">ord</span>: <span class="ident">Ordering</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> { <span class="ident">Shared::from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">fetch_and</span>(<span class="ident">val</span> <span class="op">|</span> <span class="op">!</span><span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(), <span class="ident">ord</span>)) }
}
<span class="doccomment">/// Bitwise "or" with the current tag.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Performs a bitwise "or" operation on the current tag and the argument `val`, and sets the</span>
<span class="doccomment">/// new tag to the result. Returns the previous pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method takes an [`Ordering`] argument which describes the memory ordering of this</span>
<span class="doccomment">/// operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Shared};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::<i32>::from(Shared::null().with_tag(1));</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// assert_eq!(a.fetch_or(2, SeqCst, guard).tag(), 1);</span>
<span class="doccomment">/// assert_eq!(a.load(SeqCst, guard).tag(), 3);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_or</span><span class="op"><</span><span class="lifetime">'g</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">usize</span>, <span class="ident">ord</span>: <span class="ident">Ordering</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> { <span class="ident">Shared::from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">fetch_or</span>(<span class="ident">val</span> <span class="op">&</span> <span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(), <span class="ident">ord</span>)) }
}
<span class="doccomment">/// Bitwise "xor" with the current tag.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Performs a bitwise "xor" operation on the current tag and the argument `val`, and sets the</span>
<span class="doccomment">/// new tag to the result. Returns the previous pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method takes an [`Ordering`] argument which describes the memory ordering of this</span>
<span class="doccomment">/// operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Shared};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::<i32>::from(Shared::null().with_tag(1));</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// assert_eq!(a.fetch_xor(3, SeqCst, guard).tag(), 1);</span>
<span class="doccomment">/// assert_eq!(a.load(SeqCst, guard).tag(), 2);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_xor</span><span class="op"><</span><span class="lifetime">'g</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">usize</span>, <span class="ident">ord</span>: <span class="ident">Ordering</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> { <span class="ident">Shared::from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">fetch_xor</span>(<span class="ident">val</span> <span class="op">&</span> <span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(), <span class="ident">ord</span>)) }
}
<span class="doccomment">/// Takes ownership of the pointee.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This consumes the atomic and converts it into [`Owned`]. As [`Atomic`] doesn't have a</span>
<span class="doccomment">/// destructor and doesn't drop the pointee while [`Owned`] does, this is suitable for</span>
<span class="doccomment">/// destructors of data structures.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if this pointer is null, but only in debug mode.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method may be called only if the pointer is valid and nobody else is holding a</span>
<span class="doccomment">/// reference to the same object.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// # use std::mem;</span>
<span class="doccomment">/// # use crossbeam_epoch::Atomic;</span>
<span class="doccomment">/// struct DataStructure {</span>
<span class="doccomment">/// ptr: Atomic<usize>,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl Drop for DataStructure {</span>
<span class="doccomment">/// fn drop(&mut self) {</span>
<span class="doccomment">/// // By now the DataStructure lives only in our thread and we are sure we don't hold</span>
<span class="doccomment">/// // any Shared or & to it ourselves.</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// drop(mem::replace(&mut self.ptr, Atomic::null()).into_owned());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">into_owned</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">crossbeam_loom</span>)]</span>
{
<span class="comment">// FIXME: loom does not yet support into_inner, so we use unsync_load for now,</span>
<span class="comment">// which should have the same synchronization properties:</span>
<span class="comment">// https://github.com/tokio-rs/loom/issues/117</span>
<span class="ident">Owned::from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">unsync_load</span>())
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">crossbeam_loom</span>))]</span>
{
<span class="ident">Owned::from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">into_inner</span>())
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">fmt::Debug</span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt::Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt::Result</span> {
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">load</span>(<span class="ident">Ordering::SeqCst</span>);
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="ident">tag</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>);
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Atomic"</span>)
.<span class="ident">field</span>(<span class="string">"raw"</span>, <span class="kw-2">&</span><span class="ident">raw</span>)
.<span class="ident">field</span>(<span class="string">"tag"</span>, <span class="kw-2">&</span><span class="ident">tag</span>)
.<span class="ident">finish</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">fmt::Pointer</span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt::Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt::Result</span> {
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">load</span>(<span class="ident">Ordering::SeqCst</span>);
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>);
<span class="ident">fmt::Pointer::fmt</span>(<span class="kw-2">&</span>(<span class="kw">unsafe</span> { <span class="ident">T::deref</span>(<span class="ident">raw</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span> }), <span class="ident">f</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Returns a copy of the atomic value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that a `Relaxed` load is used here. If you need synchronization, use it with other</span>
<span class="doccomment">/// atomics or fences.</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">load</span>(<span class="ident">Ordering::Relaxed</span>);
<span class="ident">Atomic::from_usize</span>(<span class="ident">data</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">Atomic::null</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Returns a new atomic pointer pointing to `owned`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{Atomic, Owned};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::<i32>::from(Owned::new(1234));</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">owned</span>: <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="ident">owned</span>.<span class="ident">data</span>;
<span class="ident">mem::forget</span>(<span class="ident">owned</span>);
<span class="self">Self</span><span class="ident">::from_usize</span>(<span class="ident">data</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">b</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span><span class="ident">::from</span>(<span class="ident">Owned::from</span>(<span class="ident">b</span>))
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">t</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span><span class="ident">::new</span>(<span class="ident">t</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Returns a new atomic pointer pointing to `ptr`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{Atomic, Shared};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::<i32>::from(Shared::<i32>::null());</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">ptr</span>: <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span><span class="ident">::from_usize</span>(<span class="ident">ptr</span>.<span class="ident">data</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Returns a new atomic pointer pointing to `raw`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::ptr;</span>
<span class="doccomment">/// use crossbeam_epoch::Atomic;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::<i32>::from(ptr::null::<i32>());</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">raw</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span><span class="ident">::from_usize</span>(<span class="ident">raw</span> <span class="kw">as</span> <span class="ident">usize</span>)
}
}
<span class="doccomment">/// A trait for either `Owned` or `Shared` pointers.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> {
<span class="doccomment">/// Returns the machine representation of the pointer.</span>
<span class="kw">fn</span> <span class="ident">into_usize</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span>;
<span class="doccomment">/// Returns a new pointer pointing to the tagged pointer `data`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The given `data` should have been created by `Pointer::into_usize()`, and one `data` should</span>
<span class="doccomment">/// not be converted back by `Pointer::from_usize()` multiple times.</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">data</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>;
}
<span class="doccomment">/// An owned heap-allocated object.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This type is very similar to `Box<T>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The pointer must be properly aligned. Since it is aligned, a tag can be stored into the unused</span>
<span class="doccomment">/// least significant bits of the address.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> {
<span class="ident">data</span>: <span class="ident">usize</span>,
<span class="ident">_marker</span>: <span class="ident">PhantomData</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">into_usize</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span>;
<span class="ident">mem::forget</span>(<span class="self">self</span>);
<span class="ident">data</span>
}
<span class="doccomment">/// Returns a new pointer pointing to the tagged pointer `data`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the data is zero in debug mode.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">data</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="macro">debug_assert!</span>(<span class="ident">data</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span>, <span class="string">"converting zero into `Owned`"</span>);
<span class="ident">Owned</span> {
<span class="ident">data</span>,
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Returns a new owned pointer pointing to `raw`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function is unsafe because improper use may lead to memory problems. Argument `raw`</span>
<span class="doccomment">/// must be a valid pointer. Also, a double-free may occur if the function is called twice on</span>
<span class="doccomment">/// the same raw pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `raw` is not properly aligned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The given `raw` should have been derived from `Owned`, and one `raw` should not be converted</span>
<span class="doccomment">/// back by `Owned::from_raw()` multiple times.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let o = unsafe { Owned::from_raw(Box::into_raw(Box::new(1234))) };</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_raw</span>(<span class="ident">raw</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">raw</span> <span class="op">=</span> <span class="ident">raw</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="ident">ensure_aligned</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">raw</span>);
<span class="self">Self</span><span class="ident">::from_usize</span>(<span class="ident">raw</span>)
}
<span class="doccomment">/// Converts the owned pointer into a `Box`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let o = Owned::new(1234);</span>
<span class="doccomment">/// let b: Box<i32> = o.into_box();</span>
<span class="doccomment">/// assert_eq!(*b, 1234);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_box</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="ident">mem::forget</span>(<span class="self">self</span>);
<span class="kw">unsafe</span> { <span class="ident">Box::from_raw</span>(<span class="ident">raw</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>) }
}
<span class="doccomment">/// Allocates `value` on the heap and returns a new owned pointer pointing to it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let o = Owned::new(1234);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">init</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">Self</span><span class="ident">::init</span>(<span class="ident">init</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Allocates `value` on the heap and returns a new owned pointer pointing to it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let o = Owned::<i32>::init(1234);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">init</span>(<span class="ident">init</span>: <span class="ident">T::Init</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> { <span class="self">Self</span><span class="ident">::from_usize</span>(<span class="ident">T::init</span>(<span class="ident">init</span>)) }
}
<span class="doccomment">/// Converts the owned pointer into a [`Shared`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Owned};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let o = Owned::new(1234);</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// let p = o.into_shared(guard);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::needless_lifetimes</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_shared</span><span class="op"><</span><span class="lifetime">'g</span><span class="op">></span>(<span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> { <span class="ident">Shared::from_usize</span>(<span class="self">self</span>.<span class="ident">into_usize</span>()) }
}
<span class="doccomment">/// Returns the tag stored within the pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(Owned::new(1234).tag(), 0);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">tag</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">tag</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="ident">tag</span>
}
<span class="doccomment">/// Returns the same pointer, but tagged with `tag`. `tag` is truncated to be fit into the</span>
<span class="doccomment">/// unused bits of the pointer to `T`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let o = Owned::new(0u64);</span>
<span class="doccomment">/// assert_eq!(o.tag(), 0);</span>
<span class="doccomment">/// let o = o.with_tag(2);</span>
<span class="doccomment">/// assert_eq!(o.tag(), 2);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_tag</span>(<span class="self">self</span>, <span class="ident">tag</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">into_usize</span>();
<span class="kw">unsafe</span> { <span class="self">Self</span><span class="ident">::from_usize</span>(<span class="ident">compose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>, <span class="ident">tag</span>)) }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="kw">unsafe</span> {
<span class="ident">T::drop</span>(<span class="ident">raw</span>);
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">fmt::Debug</span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt::Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt::Result</span> {
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="ident">tag</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Owned"</span>)
.<span class="ident">field</span>(<span class="string">"raw"</span>, <span class="kw-2">&</span><span class="ident">raw</span>)
.<span class="ident">field</span>(<span class="string">"tag"</span>, <span class="kw-2">&</span><span class="ident">tag</span>)
.<span class="ident">finish</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">Owned::new</span>((<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">clone</span>()).<span class="ident">with_tag</span>(<span class="self">self</span>.<span class="ident">tag</span>())
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">T</span> {
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="kw">unsafe</span> { <span class="ident">T::deref</span>(<span class="ident">raw</span>) }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">DerefMut</span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">deref_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="kw">unsafe</span> { <span class="ident">T::deref_mut</span>(<span class="ident">raw</span>) }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">t</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">Owned::new</span>(<span class="ident">t</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Returns a new owned pointer pointing to `b`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the pointer (the `Box`) is not properly aligned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let o = unsafe { Owned::from_raw(Box::into_raw(Box::new(1234))) };</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">b</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">unsafe</span> { <span class="self">Self</span><span class="ident">::from_raw</span>(<span class="ident">Box::into_raw</span>(<span class="ident">b</span>)) }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Borrow</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">borrow</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">deref</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">BorrowMut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">borrow_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">deref_mut</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">AsRef</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">deref</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">AsMut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">as_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">deref_mut</span>()
}
}
<span class="doccomment">/// A pointer to an object protected by the epoch GC.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The pointer is valid for use only during the lifetime `'g`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The pointer must be properly aligned. Since it is aligned, a tag can be stored into the unused</span>
<span class="doccomment">/// least significant bits of the address.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>: <span class="lifetime">'g</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> {
<span class="ident">data</span>: <span class="ident">usize</span>,
<span class="ident">_marker</span>: <span class="ident">PhantomData</span><span class="op"><</span>(<span class="kw-2">&</span><span class="lifetime">'g</span> (), <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>)<span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span> {
<span class="ident">data</span>: <span class="self">self</span>.<span class="ident">data</span>,
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Copy</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">into_usize</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">data</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">data</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">Shared</span> {
<span class="ident">data</span>,
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Converts the pointer to a raw pointer (without the tag).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let o = Owned::new(1234);</span>
<span class="doccomment">/// let raw = &*o as *const _;</span>
<span class="doccomment">/// let a = Atomic::from(o);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
<span class="doccomment">/// assert_eq!(p.as_raw(), raw);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::trivially_copy_pass_by_ref</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_raw</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> {
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="ident">raw</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span>
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Returns a new null pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::Shared;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let p = Shared::<i32>::null();</span>
<span class="doccomment">/// assert!(p.is_null());</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">null</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="ident">Shared</span> {
<span class="ident">data</span>: <span class="number">0</span>,
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
}
}
<span class="doccomment">/// Returns `true` if the pointer is null.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::null();</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// assert!(a.load(SeqCst, guard).is_null());</span>
<span class="doccomment">/// a.store(Owned::new(1234), SeqCst);</span>
<span class="doccomment">/// assert!(!a.load(SeqCst, guard).is_null());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::trivially_copy_pass_by_ref</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_null</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="ident">raw</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span>
}
<span class="doccomment">/// Dereferences the pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns a reference to the pointee that is valid during the lifetime `'g`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Dereferencing a pointer is unsafe because it could be pointing to invalid memory.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Another concern is the possibility of data races due to lack of proper synchronization.</span>
<span class="doccomment">/// For example, consider the following scenario:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 1. A thread creates a new object: `a.store(Owned::new(10), Relaxed)`</span>
<span class="doccomment">/// 2. Another thread reads it: `*a.load(Relaxed, guard).as_ref().unwrap()`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The problem is that relaxed orderings don't synchronize initialization of the object with</span>
<span class="doccomment">/// the read from the second thread. This is a data race. A possible solution would be to use</span>
<span class="doccomment">/// `Release` and `Acquire` orderings.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(1234);</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// assert_eq!(p.deref(), &1234);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::trivially_copy_pass_by_ref</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::should_implement_trait</span>)]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">T</span> {
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="ident">T::deref</span>(<span class="ident">raw</span>)
}
<span class="doccomment">/// Dereferences the pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns a mutable reference to the pointee that is valid during the lifetime `'g`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * There is no guarantee that there are no more threads attempting to read/write from/to the</span>
<span class="doccomment">/// actual object at the same time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The user must know that there are no concurrent accesses towards the object itself.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * Other than the above, all safety concerns of `deref()` applies here.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(vec![1, 2, 3, 4]);</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut p = a.load(SeqCst, guard);</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// assert!(!p.is_null());</span>
<span class="doccomment">/// let b = p.deref_mut();</span>
<span class="doccomment">/// assert_eq!(b, &vec![1, 2, 3, 4]);</span>
<span class="doccomment">/// b.push(5);</span>
<span class="doccomment">/// assert_eq!(b, &vec![1, 2, 3, 4, 5]);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// assert_eq!(p.deref(), &vec![1, 2, 3, 4, 5]);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::should_implement_trait</span>)]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">deref_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="ident">T::deref_mut</span>(<span class="ident">raw</span>)
}
<span class="doccomment">/// Converts the pointer to a reference.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns `None` if the pointer is null, or else a reference to the object wrapped in `Some`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Dereferencing a pointer is unsafe because it could be pointing to invalid memory.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Another concern is the possibility of data races due to lack of proper synchronization.</span>
<span class="doccomment">/// For example, consider the following scenario:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 1. A thread creates a new object: `a.store(Owned::new(10), Relaxed)`</span>
<span class="doccomment">/// 2. Another thread reads it: `*a.load(Relaxed, guard).as_ref().unwrap()`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The problem is that relaxed orderings don't synchronize initialization of the object with</span>
<span class="doccomment">/// the read from the second thread. This is a data race. A possible solution would be to use</span>
<span class="doccomment">/// `Release` and `Acquire` orderings.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(1234);</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// assert_eq!(p.as_ref(), Some(&1234));</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::trivially_copy_pass_by_ref</span>)]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">T</span><span class="op">></span> {
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="kw">if</span> <span class="ident">raw</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="prelude-val">Some</span>(<span class="ident">T::deref</span>(<span class="ident">raw</span>))
}
}
<span class="doccomment">/// Takes ownership of the pointee.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if this pointer is null, but only in debug mode.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method may be called only if the pointer is valid and nobody else is holding a</span>
<span class="doccomment">/// reference to the same object.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(1234);</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// let guard = &epoch::unprotected();</span>
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
<span class="doccomment">/// drop(p.into_owned());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">into_owned</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="macro">debug_assert!</span>(<span class="op">!</span><span class="self">self</span>.<span class="ident">is_null</span>(), <span class="string">"converting a null `Shared` into `Owned`"</span>);
<span class="ident">Owned::from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>)
}
<span class="doccomment">/// Returns the tag stored within the pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::<u64>::from(Owned::new(0u64).with_tag(2));</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
<span class="doccomment">/// assert_eq!(p.tag(), 2);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::trivially_copy_pass_by_ref</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">tag</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">tag</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="ident">tag</span>
}
<span class="doccomment">/// Returns the same pointer, but tagged with `tag`. `tag` is truncated to be fit into the</span>
<span class="doccomment">/// unused bits of the pointer to `T`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = Atomic::new(0u64);</span>
<span class="doccomment">/// let guard = &epoch::pin();</span>
<span class="doccomment">/// let p1 = a.load(SeqCst, guard);</span>
<span class="doccomment">/// let p2 = p1.with_tag(2);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(p1.tag(), 0);</span>
<span class="doccomment">/// assert_eq!(p2.tag(), 2);</span>
<span class="doccomment">/// assert_eq!(p1.as_raw(), p2.as_raw());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::trivially_copy_pass_by_ref</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_tag</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tag</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> { <span class="self">Self</span><span class="ident">::from_usize</span>(<span class="ident">compose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>, <span class="ident">tag</span>)) }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Returns a new pointer pointing to `raw`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `raw` is not properly aligned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_epoch::Shared;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let p = Shared::from(Box::into_raw(Box::new(1234)) as *const _);</span>
<span class="doccomment">/// assert!(!p.is_null());</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">raw</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">raw</span> <span class="op">=</span> <span class="ident">raw</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="ident">ensure_aligned</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">raw</span>);
<span class="kw">unsafe</span> { <span class="self">Self</span><span class="ident">::from_usize</span>(<span class="ident">raw</span>) }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">data</span> <span class="op">=</span><span class="op">=</span> <span class="ident">other</span>.<span class="ident">data</span>
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">PartialOrd</span><span class="op"><</span><span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">cmp::Ordering</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">data</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">cmp::Ordering</span> {
<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">data</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">fmt::Debug</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt::Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt::Result</span> {
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="ident">tag</span>) <span class="op">=</span> <span class="ident">decompose_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Shared"</span>)
.<span class="ident">field</span>(<span class="string">"raw"</span>, <span class="kw-2">&</span><span class="ident">raw</span>)
.<span class="ident">field</span>(<span class="string">"tag"</span>, <span class="kw-2">&</span><span class="ident">tag</span>)
.<span class="ident">finish</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">fmt::Pointer</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt::Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt::Result</span> {
<span class="ident">fmt::Pointer::fmt</span>(<span class="kw-2">&</span>(<span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">deref</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span> }), <span class="ident">f</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Pointable</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">Shared::null</span>()
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">test</span>, <span class="ident">not</span>(<span class="ident">crossbeam_loom</span>)))]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">Owned</span>, <span class="ident">Shared</span>};
<span class="kw">use</span> <span class="ident">std::mem::MaybeUninit</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">valid_tag_i8</span>() {
<span class="ident">Shared</span>::<span class="op"><</span><span class="ident">i8</span><span class="op">></span><span class="ident">::null</span>().<span class="ident">with_tag</span>(<span class="number">0</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">valid_tag_i64</span>() {
<span class="ident">Shared</span>::<span class="op"><</span><span class="ident">i64</span><span class="op">></span><span class="ident">::null</span>().<span class="ident">with_tag</span>(<span class="number">7</span>);
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"nightly"</span>)]</span>
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">const_atomic_null</span>() {
<span class="kw">use</span> <span class="kw">super</span><span class="ident">::Atomic</span>;
<span class="kw">static</span> <span class="ident">_U</span>: <span class="ident">Atomic</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> <span class="op">=</span> <span class="ident">Atomic</span>::<span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="ident">::null</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">array_init</span>() {
<span class="kw">let</span> <span class="ident">owned</span> <span class="op">=</span> <span class="ident">Owned</span>::<span class="op"><</span>[<span class="ident">MaybeUninit</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>]<span class="op">></span><span class="ident">::init</span>(<span class="number">10</span>);
<span class="kw">let</span> <span class="ident">arr</span>: <span class="kw-2">&</span>[<span class="ident">MaybeUninit</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>] <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">owned</span>;
<span class="macro">assert_eq!</span>(<span class="ident">arr</span>.<span class="ident">len</span>(), <span class="number">10</span>);
}
}
</pre></div>
</section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../../" data-current-crate="crossbeam_epoch" data-search-index-js="../../search-index.js" data-search-js="../../search.js"></div><script src="../../main.js"></script><script src="../../source-script.js"></script><script src="../../source-files.js"></script></body></html>