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
|
#![warn(rust_2018_idioms)]
use tokio::pin;
use tokio_util::sync::CancellationToken;
use core::future::Future;
use core::task::{Context, Poll};
use futures_test::task::new_count_waker;
#[test]
fn cancel_token() {
let (waker, wake_counter) = new_count_waker();
let token = CancellationToken::new();
assert_eq!(false, token.is_cancelled());
let wait_fut = token.cancelled();
pin!(wait_fut);
assert_eq!(
Poll::Pending,
wait_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
assert_eq!(wake_counter, 0);
let wait_fut_2 = token.cancelled();
pin!(wait_fut_2);
token.cancel();
assert_eq!(wake_counter, 1);
assert_eq!(true, token.is_cancelled());
assert_eq!(
Poll::Ready(()),
wait_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
assert_eq!(
Poll::Ready(()),
wait_fut_2.as_mut().poll(&mut Context::from_waker(&waker))
);
}
#[test]
fn cancel_child_token_through_parent() {
let (waker, wake_counter) = new_count_waker();
let token = CancellationToken::new();
let child_token = token.child_token();
assert!(!child_token.is_cancelled());
let child_fut = child_token.cancelled();
pin!(child_fut);
let parent_fut = token.cancelled();
pin!(parent_fut);
assert_eq!(
Poll::Pending,
child_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
assert_eq!(
Poll::Pending,
parent_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
assert_eq!(wake_counter, 0);
token.cancel();
assert_eq!(wake_counter, 2);
assert_eq!(true, token.is_cancelled());
assert_eq!(true, child_token.is_cancelled());
assert_eq!(
Poll::Ready(()),
child_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
assert_eq!(
Poll::Ready(()),
parent_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
}
#[test]
fn cancel_child_token_without_parent() {
let (waker, wake_counter) = new_count_waker();
let token = CancellationToken::new();
let child_token_1 = token.child_token();
let child_fut = child_token_1.cancelled();
pin!(child_fut);
let parent_fut = token.cancelled();
pin!(parent_fut);
assert_eq!(
Poll::Pending,
child_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
assert_eq!(
Poll::Pending,
parent_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
assert_eq!(wake_counter, 0);
child_token_1.cancel();
assert_eq!(wake_counter, 1);
assert_eq!(false, token.is_cancelled());
assert_eq!(true, child_token_1.is_cancelled());
assert_eq!(
Poll::Ready(()),
child_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
assert_eq!(
Poll::Pending,
parent_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
let child_token_2 = token.child_token();
let child_fut_2 = child_token_2.cancelled();
pin!(child_fut_2);
assert_eq!(
Poll::Pending,
child_fut_2.as_mut().poll(&mut Context::from_waker(&waker))
);
assert_eq!(
Poll::Pending,
parent_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
token.cancel();
assert_eq!(wake_counter, 3);
assert_eq!(true, token.is_cancelled());
assert_eq!(true, child_token_2.is_cancelled());
assert_eq!(
Poll::Ready(()),
child_fut_2.as_mut().poll(&mut Context::from_waker(&waker))
);
assert_eq!(
Poll::Ready(()),
parent_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
}
#[test]
fn create_child_token_after_parent_was_cancelled() {
for drop_child_first in [true, false].iter().cloned() {
let (waker, wake_counter) = new_count_waker();
let token = CancellationToken::new();
token.cancel();
let child_token = token.child_token();
assert!(child_token.is_cancelled());
{
let child_fut = child_token.cancelled();
pin!(child_fut);
let parent_fut = token.cancelled();
pin!(parent_fut);
assert_eq!(
Poll::Ready(()),
child_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
assert_eq!(
Poll::Ready(()),
parent_fut.as_mut().poll(&mut Context::from_waker(&waker))
);
assert_eq!(wake_counter, 0);
drop(child_fut);
drop(parent_fut);
}
if drop_child_first {
drop(child_token);
drop(token);
} else {
drop(token);
drop(child_token);
}
}
}
#[test]
fn drop_multiple_child_tokens() {
for drop_first_child_first in &[true, false] {
let token = CancellationToken::new();
let mut child_tokens = [None, None, None];
for child in &mut child_tokens {
*child = Some(token.child_token());
}
assert!(!token.is_cancelled());
assert!(!child_tokens[0].as_ref().unwrap().is_cancelled());
for i in 0..child_tokens.len() {
if *drop_first_child_first {
child_tokens[i] = None;
} else {
child_tokens[child_tokens.len() - 1 - i] = None;
}
assert!(!token.is_cancelled());
}
drop(token);
}
}
#[test]
fn drop_parent_before_child_tokens() {
let token = CancellationToken::new();
let child1 = token.child_token();
let child2 = token.child_token();
drop(token);
assert!(!child1.is_cancelled());
drop(child1);
drop(child2);
}
|
