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 | |
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(r == 0); |
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 | |
72 | static void close_cb(uv_handle_t* handle) { |
73 | ASSERT(handle != NULL); |
74 | close_cb_called++; |
75 | } |
76 | |
77 | |
78 | static void async_cb(uv_async_t* handle) { |
79 | int n; |
80 | |
81 | ASSERT(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 | |
94 | static void prepare_cb(uv_prepare_t* handle) { |
95 | int r; |
96 | |
97 | ASSERT(handle == &prepare); |
98 | |
99 | if (prepare_cb_called++) |
100 | return; |
101 | |
102 | r = uv_thread_create(&thread, thread_cb, NULL); |
103 | ASSERT(r == 0); |
104 | uv_mutex_unlock(&mutex); |
105 | } |
106 | |
107 | |
108 | TEST_IMPL(async) { |
109 | int r; |
110 | |
111 | r = uv_mutex_init(&mutex); |
112 | ASSERT(r == 0); |
113 | uv_mutex_lock(&mutex); |
114 | |
115 | r = uv_prepare_init(uv_default_loop(), &prepare); |
116 | ASSERT(r == 0); |
117 | r = uv_prepare_start(&prepare, prepare_cb); |
118 | ASSERT(r == 0); |
119 | |
120 | r = uv_async_init(uv_default_loop(), &async, async_cb); |
121 | ASSERT(r == 0); |
122 | |
123 | r = uv_run(uv_default_loop(), UV_RUN_DEFAULT); |
124 | ASSERT(r == 0); |
125 | |
126 | ASSERT(prepare_cb_called > 0); |
127 | ASSERT(async_cb_called == 3); |
128 | ASSERT(close_cb_called == 2); |
129 | |
130 | ASSERT(0 == uv_thread_join(&thread)); |
131 | |
132 | MAKE_VALGRIND_HAPPY(); |
133 | return 0; |
134 | } |
135 | |