1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to
5 * deal in the Software without restriction, including without limitation the
6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
7 * sell copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
19 * IN THE SOFTWARE.
20 */
21
22 #include "uv.h"
23 #include "task.h"
24 #include <stdio.h>
25 #include <stdlib.h>
26
27 static uv_thread_t thread;
28 static uv_mutex_t mutex;
29
30 static uv_prepare_t prepare;
31 static uv_async_t async;
32
33 static volatile int async_cb_called;
34 static int prepare_cb_called;
35 static int close_cb_called;
36
37
thread_cb(void * arg)38 static void thread_cb(void *arg) {
39 int n;
40 int r;
41
42 for (;;) {
43 uv_mutex_lock(&mutex);
44 n = async_cb_called;
45 uv_mutex_unlock(&mutex);
46
47 if (n == 3) {
48 break;
49 }
50
51 r = uv_async_send(&async);
52 ASSERT_OK(r);
53
54 /* Work around a bug in Valgrind.
55 *
56 * Valgrind runs threads not in parallel but sequentially, i.e. one after
57 * the other. It also doesn't preempt them, instead it depends on threads
58 * yielding voluntarily by making a syscall.
59 *
60 * That never happens here: the pipe that is associated with the async
61 * handle is written to once but that's too early for Valgrind's scheduler
62 * to kick in. Afterwards, the thread busy-loops, starving the main thread.
63 * Therefore, we yield.
64 *
65 * This behavior has been observed with Valgrind 3.7.0 and 3.9.0.
66 */
67 uv_sleep(0);
68 }
69 }
70
71
close_cb(uv_handle_t * handle)72 static void close_cb(uv_handle_t* handle) {
73 ASSERT_NOT_NULL(handle);
74 close_cb_called++;
75 }
76
77
async_cb(uv_async_t * handle)78 static void async_cb(uv_async_t* handle) {
79 int n;
80
81 ASSERT_PTR_EQ(handle, &async);
82
83 uv_mutex_lock(&mutex);
84 n = ++async_cb_called;
85 uv_mutex_unlock(&mutex);
86
87 if (n == 3) {
88 uv_close((uv_handle_t*)&async, close_cb);
89 uv_close((uv_handle_t*)&prepare, close_cb);
90 }
91 }
92
93
prepare_cb(uv_prepare_t * handle)94 static void prepare_cb(uv_prepare_t* handle) {
95 int r;
96
97 ASSERT_PTR_EQ(handle, &prepare);
98
99 if (prepare_cb_called++)
100 return;
101
102 r = uv_thread_create(&thread, thread_cb, NULL);
103 ASSERT_OK(r);
104 uv_mutex_unlock(&mutex);
105 }
106
107
TEST_IMPL(async)108 TEST_IMPL(async) {
109 int r;
110
111 r = uv_mutex_init(&mutex);
112 ASSERT_OK(r);
113 uv_mutex_lock(&mutex);
114
115 r = uv_prepare_init(uv_default_loop(), &prepare);
116 ASSERT_OK(r);
117 r = uv_prepare_start(&prepare, prepare_cb);
118 ASSERT_OK(r);
119
120 r = uv_async_init(uv_default_loop(), &async, async_cb);
121 ASSERT_OK(r);
122
123 r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
124 ASSERT_OK(r);
125
126 ASSERT_GT(prepare_cb_called, 0);
127 ASSERT_EQ(3, async_cb_called);
128 ASSERT_EQ(2, close_cb_called);
129
130 ASSERT_OK(uv_thread_join(&thread));
131
132 MAKE_VALGRIND_HAPPY(uv_default_loop());
133 return 0;
134 }
135
