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
extern crate futures;
use futures::{prelude::*, sync::oneshot};
use std::{
collections::VecDeque,
sync::{Arc, Mutex, atomic::AtomicUsize, atomic::Ordering::SeqCst},
};
pub struct Waiter {
inner: oneshot::Receiver<usize>,
}
impl Future for Waiter {
type Error = ();
type Item = usize;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> { self.inner.poll().map_err(|_| ()) }
}
#[derive(Clone)]
pub struct Turnstyle {
waiters: Arc<Mutex<VecDeque<oneshot::Sender<usize>>>>,
version: Arc<AtomicUsize>,
}
impl Turnstyle {
pub fn new() -> Turnstyle {
Turnstyle {
waiters: Arc::new(Mutex::new(VecDeque::new())),
version: Arc::new(AtomicUsize::new(0)),
}
}
pub fn join(&self) -> Waiter {
let (tx, rx) = oneshot::channel();
{
let mut waiters = self.waiters.lock().expect("turnstyle unable to join line");
waiters.push_back(tx);
}
Waiter { inner: rx }
}
pub fn turn(&self) -> bool {
let waiter = {
let mut waiters = self.waiters.lock().unwrap();
waiters.pop_front()
};
if let Some(w) = waiter {
let version = self.version.fetch_add(1, SeqCst);
w.send(version).expect("turnstyle failed to signal next in line");
true
} else {
false
}
}
}
impl Drop for Turnstyle {
fn drop(&mut self) {
while self.turn() {}
}
}
#[cfg(test)]
mod tests {
use super::Turnstyle;
use futures::{future, Future, Async};
#[test]
fn single_waiter() {
future::lazy(|| {
let ts = Turnstyle::new();
let mut w = ts.join();
assert!(!w.poll().unwrap().is_ready());
ts.turn();
assert!(w.poll().unwrap().is_ready());
future::ok::<_, ()>(())
}).wait()
.unwrap();
}
#[test]
fn multiple_waiters() {
future::lazy(|| {
let ts = Turnstyle::new();
let mut w1 = ts.join();
let mut w2 = ts.join();
let mut w3 = ts.join();
assert!(!w1.poll().unwrap().is_ready());
assert!(!w2.poll().unwrap().is_ready());
assert!(!w2.poll().unwrap().is_ready());
ts.turn();
assert!(w1.poll().unwrap().is_ready());
assert!(!w2.poll().unwrap().is_ready());
assert!(!w3.poll().unwrap().is_ready());
ts.turn();
assert!(w2.poll().unwrap().is_ready());
assert!(!w3.poll().unwrap().is_ready());
ts.turn();
assert!(w3.poll().unwrap().is_ready());
future::ok::<_, ()>(())
}).wait()
.unwrap();
}
#[test]
fn versions() {
future::lazy(|| {
let ts = Turnstyle::new();
let mut w1 = ts.join();
let mut w2 = ts.join();
let mut w3 = ts.join();
ts.turn();
ts.turn();
ts.turn();
if let Async::Ready(w1v) = w1.poll().unwrap() {
assert_eq!(w1v, 0);
} else {
panic!("waiter 1 was not ready");
}
if let Async::Ready(w2v) = w2.poll().unwrap() {
assert_eq!(w2v, 1);
} else {
panic!("waiter 2 was not ready");
}
if let Async::Ready(w3v) = w3.poll().unwrap() {
assert_eq!(w3v, 2);
} else {
panic!("waiter 3 was not ready");
}
future::ok::<_, ()>(())
}).wait()
.unwrap();
}
#[test]
fn on_drop() {
future::lazy(|| {
let ts = Turnstyle::new();
let mut w1 = ts.join();
let mut w2 = ts.join();
let mut w3 = ts.join();
assert!(!w1.poll().unwrap().is_ready());
assert!(!w2.poll().unwrap().is_ready());
assert!(!w2.poll().unwrap().is_ready());
drop(ts);
assert!(w1.poll().unwrap().is_ready());
assert!(w2.poll().unwrap().is_ready());
assert!(w3.poll().unwrap().is_ready());
future::ok::<_, ()>(())
}).wait()
.unwrap();
}
}