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
|
/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "uv.h"
#include "task.h"
#include <stdio.h>
#include <stdlib.h>
static uv_thread_t thread;
static uv_mutex_t mutex;
static uv_prepare_t prepare;
static uv_async_t async;
static volatile int async_cb_called;
static int prepare_cb_called;
static int close_cb_called;
static void thread_cb(void *arg) {
int n;
int r;
for (;;) {
uv_mutex_lock(&mutex);
n = async_cb_called;
uv_mutex_unlock(&mutex);
if (n == 3) {
break;
}
r = uv_async_send(&async);
ASSERT_OK(r);
/* Work around a bug in Valgrind.
*
* Valgrind runs threads not in parallel but sequentially, i.e. one after
* the other. It also doesn't preempt them, instead it depends on threads
* yielding voluntarily by making a syscall.
*
* That never happens here: the pipe that is associated with the async
* handle is written to once but that's too early for Valgrind's scheduler
* to kick in. Afterwards, the thread busy-loops, starving the main thread.
* Therefore, we yield.
*
* This behavior has been observed with Valgrind 3.7.0 and 3.9.0.
*/
uv_sleep(0);
}
}
static void close_cb(uv_handle_t* handle) {
ASSERT_NOT_NULL(handle);
close_cb_called++;
}
static void async_cb(uv_async_t* handle) {
int n;
ASSERT_PTR_EQ(handle, &async);
uv_mutex_lock(&mutex);
n = ++async_cb_called;
uv_mutex_unlock(&mutex);
if (n == 3) {
uv_close((uv_handle_t*)&async, close_cb);
uv_close((uv_handle_t*)&prepare, close_cb);
}
}
static void prepare_cb(uv_prepare_t* handle) {
int r;
ASSERT_PTR_EQ(handle, &prepare);
if (prepare_cb_called++)
return;
r = uv_thread_create(&thread, thread_cb, NULL);
ASSERT_OK(r);
uv_mutex_unlock(&mutex);
}
TEST_IMPL(async) {
int r;
r = uv_mutex_init(&mutex);
ASSERT_OK(r);
uv_mutex_lock(&mutex);
r = uv_prepare_init(uv_default_loop(), &prepare);
ASSERT_OK(r);
r = uv_prepare_start(&prepare, prepare_cb);
ASSERT_OK(r);
r = uv_async_init(uv_default_loop(), &async, async_cb);
ASSERT_OK(r);
r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
ASSERT_OK(r);
ASSERT_GT(prepare_cb_called, 0);
ASSERT_EQ(3, async_cb_called);
ASSERT_EQ(2, close_cb_called);
ASSERT_OK(uv_thread_join(&thread));
MAKE_VALGRIND_HAPPY(uv_default_loop());
return 0;
}
|
