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