1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
use std::cell::UnsafeCell;
use std::collections::HashMap;
use std::future::Future;
use std::mem::{replace, transmute};
use std::sync::Arc;
use futures::future::JoinAll;
use unchecked_unwrap::UncheckedUnwrap;
use xjbutil::async_utils::{Mutex, MutexGuard, join_all, oneshot, task, yield_now};
use xjbutil::async_utils::oneshot::{Receiver, Sender};
use xjbutil::unchecked::{UncheckedCellOps, UncheckedOption};
pub type Serializer<Data> = Arc<Mutex<Data>>;
pub type SerializerLock<'a, Data> = MutexGuard<'a, Data>;
pub async fn co_yield<'a, D>(
serializer: &'a Serializer<D>,
lock: SerializerLock<'a, D>
) -> SerializerLock<'a, D>
where D: 'static
{
drop(lock);
yield_now().await;
serializer.lock().await
}
pub async fn co_await<'a, D, FUT, T>(
serializer: &'a Serializer<D>,
lock: SerializerLock<'a, D>,
fut: FUT
) -> (T, SerializerLock<'a, D>)
where D: 'static,
FUT: Future<Output=T>,
T: Send + Sync
{
drop(lock);
let ret: T = fut.await;
let lock = serializer.lock().await;
(ret, lock)
}
pub async fn co_spawn<'a, 'b, D, FN, ARGS, FUT, RET>(
serializer: &'b Serializer<D>,
lock: SerializerLock<'a, D>,
f: FN,
args: ARGS
) -> (task::JoinHandle<RET>, SerializerLock<'b, D>)
where D: 'static,
FN: (FnOnce(Serializer<D>, SerializerLock<'a, D>, ARGS) -> FUT) + Send + 'static,
ARGS: Send + 'static,
FUT: Future<Output=RET> + Send + 'static,
RET: Send + 'static
{
let serializer_clone: Serializer<D> = serializer.clone();
let join_handle: task::JoinHandle<RET> = task::spawn(f(serializer_clone, lock, args));
let lock: SerializerLock<'b, D> = serializer.lock().await;
(join_handle, lock)
}
pub struct CoroutineSharedData {
next_task_id: u32,
running_tasks: HashMap<u32, Receiver<()>>
}
impl CoroutineSharedData {
pub fn new() -> Self {
Self {
next_task_id: 1,
running_tasks: HashMap::new()
}
}
pub fn add_task(&mut self, rx: Receiver<()>) -> u32 {
let task_id: u32 = self.get_next_id();
self.running_tasks.insert(task_id, rx);
task_id
}
pub fn remove_task(&mut self, task_id: u32) {
self.running_tasks.remove(&task_id);
}
pub fn retrieve_all_tasks(&mut self) -> HashMap<u32, Receiver<()>> {
replace(&mut self.running_tasks, HashMap::new())
}
fn get_next_id(&mut self) -> u32 {
let r: u32 = self.next_task_id;
self.next_task_id += 1;
r
}
}
pub struct CoroutineContext<SerializedData: 'static + Send> {
pub serializer: Serializer<(CoroutineSharedData, SerializedData)>,
permit: UnsafeCell<UncheckedOption<
SerializerLock<'static, (CoroutineSharedData, SerializedData)>
>>,
pub task_id: u32
}
impl<SD: 'static + Send> CoroutineContext<SD> {
pub async fn main_context(shared_data: SD) -> Self {
let serializer: Serializer<(CoroutineSharedData, SD)>
= Arc::new(Mutex::new((CoroutineSharedData::new(), shared_data)));
let permit: SerializerLock<(CoroutineSharedData, SD)>
= unsafe { transmute::<>(serializer.lock().await) };
Self {
serializer,
permit: UnsafeCell::new(UncheckedOption::new(permit)),
task_id: 0
}
}
pub fn child_context(
serializer: Serializer<(CoroutineSharedData, SD)>,
permit: SerializerLock<'static, (CoroutineSharedData, SD)>,
task_id: u32
) -> Self {
Self {
serializer,
permit: UnsafeCell::new(UncheckedOption::new(permit)),
task_id
}
}
pub fn get_shared_data_mut(&mut self) -> &mut SD {
unsafe {
let permit: &mut UncheckedOption<SerializerLock<(CoroutineSharedData, SD)>> =
self.permit.get_mut_ref_unchecked();
&mut permit.get_mut().1
}
}
pub async fn co_yield(&self) {
let permit: SerializerLock<'static, (CoroutineSharedData, SD)>
= unsafe { self.release_permit() };
let permit: SerializerLock<'_, (CoroutineSharedData, SD)>
= co_yield(&self.serializer, permit).await;
unsafe { self.acquire_permit(permit) }
}
pub async fn co_await<FUT, RET>(&self, fut: FUT) -> RET
where FUT: Future<Output=RET>,
RET: Send + Sync
{
let permit: SerializerLock<'static, (CoroutineSharedData, SD)>
= unsafe { self.release_permit() };
let (ret, permit): (RET, SerializerLock<'_, (CoroutineSharedData, SD)>)
= co_await(&self.serializer, permit, fut).await;
unsafe { self.acquire_permit(permit) }
ret
}
pub async fn co_spawn_task<FN, ARGS, FUT, RET>(
&self,
f: FN,
args: ARGS
) -> task::JoinHandle<RET>
where FN: (FnOnce(CoroutineContext<SD>, ARGS) -> FUT) + Send + 'static,
ARGS: Send + 'static,
FUT: Future<Output=RET> + Send,
RET: Send + 'static
{
let (tx, rx): (Sender<()>, Receiver<()>) = oneshot::channel();
let mut permit: SerializerLock<'static, (CoroutineSharedData, SD)>
= unsafe { self.release_permit() };
let task_id: u32 = permit.0.add_task(rx);
let (join_handle, new_permit): (task::JoinHandle<RET>, SerializerLock<_>) = co_spawn(
&self.serializer,
permit,
move |serializer, permit, ()| async move {
let child_context: CoroutineContext<SD> = Self::child_context(
serializer,
permit,
task_id
);
let r: RET = f(child_context, args).await;
let _ = tx.send(());
r
},
()).await;
unsafe { self.acquire_permit(new_permit); }
join_handle
}
pub async fn finish(&self) {
loop {
unsafe {
let running_tasks: HashMap<u32, Receiver<()>> =
self.permit.get_mut_ref_unchecked().get_mut().0.retrieve_all_tasks();
if running_tasks.len() == 0 {
break;
}
let fut: JoinAll<_ > = join_all(
running_tasks.into_iter().map(|(_tid, rx): (u32, Receiver<()>)| async move {
rx.await.unchecked_unwrap()
})
);
self.co_await(fut).await;
}
}
}
unsafe fn acquire_permit(&self, permit: SerializerLock<'_, (CoroutineSharedData, SD)>) {
let permit: SerializerLock<'static, (CoroutineSharedData, SD)> = transmute::<>(permit);
self.permit.get_mut_ref_unchecked().set(permit);
}
#[must_use]
unsafe fn release_permit(&self) -> SerializerLock<'static, (CoroutineSharedData, SD)> {
self.permit.get_mut_ref_unchecked().take()
}
}
impl<SD: 'static + Send> Drop for CoroutineContext<SD> {
fn drop(&mut self) {
let mut permit: SerializerLock<(CoroutineSharedData, SD)>
= unsafe { self.permit.get_mut().take() };
if self.task_id == 0 {
assert_eq!(permit.0.running_tasks.len(), 0);
} else {
permit.0.remove_task(self.task_id);
}
drop(permit);
}
}
unsafe impl<SD: 'static + Send> Send for CoroutineContext<SD> {}
unsafe impl<SD: 'static + Send> Sync for CoroutineContext<SD> {}
#[cfg(test)]
mod test {
use std::time::Duration;
use xjbutil::async_utils::{block_on_future, testing_sleep};
use crate::util::serializer::CoroutineContext;
#[test]
fn basic_test_print() {
async fn test_impl() {
let serializer: CoroutineContext<()> = CoroutineContext::main_context(()).await;
eprintln!("line 1");
serializer.co_spawn_task(|serializer: CoroutineContext<()>, _x: ()| async move {
eprintln!("line 2");
serializer.co_yield().await;
eprintln!("line 3");
}, ()).await;
eprintln!("line 4");
serializer.co_spawn_task(|serializer: CoroutineContext<()>, _x: ()| async move {
eprintln!("line 5");
serializer.co_yield().await;
eprintln!("line 6");
serializer.co_await(testing_sleep(Duration::from_millis(500))).await;
eprintln!("line 7");
}, ()).await;
eprintln!("line 8");
serializer.finish().await;
eprintln!("line 9");
}
eprintln!("launching test");
block_on_future(test_impl());
eprintln!("mission accomplished");
}
}