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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
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25 #include <stdlib.h>
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26 #include <string.h>
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27
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28 typedef struct {
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29 uv_mutex_t mutex;
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30 uv_sem_t sem;
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31 int delay;
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32 volatile int posted;
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33 } worker_config;
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34
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35
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36 static void worker(void* arg) {
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37 worker_config* c = arg;
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38
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39 if (c->delay)
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40 uv_sleep(c->delay);
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41
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42 uv_mutex_lock(&c->mutex);
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43 ASSERT_OK(c->posted);
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44 uv_sem_post(&c->sem);
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45 c->posted = 1;
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46 uv_mutex_unlock(&c->mutex);
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47 }
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48
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49
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50 TEST_IMPL(semaphore_1) {
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51 uv_thread_t thread;
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52 worker_config wc;
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53
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54 memset(&wc, 0, sizeof(wc));
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55
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56 ASSERT_OK(uv_sem_init(&wc.sem, 0));
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57 ASSERT_OK(uv_mutex_init(&wc.mutex));
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58 ASSERT_OK(uv_thread_create(&thread, worker, &wc));
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59
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60 uv_sleep(100);
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61 uv_mutex_lock(&wc.mutex);
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62 ASSERT_EQ(1, wc.posted);
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63 uv_sem_wait(&wc.sem); /* should not block */
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64 uv_mutex_unlock(&wc.mutex); /* ergo, it should be ok to unlock after wait */
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65
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66 ASSERT_OK(uv_thread_join(&thread));
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67 uv_mutex_destroy(&wc.mutex);
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68 uv_sem_destroy(&wc.sem);
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69
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70 return 0;
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71 }
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72
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73
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74 TEST_IMPL(semaphore_2) {
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75 uv_thread_t thread;
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76 worker_config wc;
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77
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78 memset(&wc, 0, sizeof(wc));
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79 wc.delay = 100;
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80
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81 ASSERT_OK(uv_sem_init(&wc.sem, 0));
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82 ASSERT_OK(uv_mutex_init(&wc.mutex));
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83 ASSERT_OK(uv_thread_create(&thread, worker, &wc));
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84
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85 uv_sem_wait(&wc.sem);
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86
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87 ASSERT_OK(uv_thread_join(&thread));
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88 uv_mutex_destroy(&wc.mutex);
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89 uv_sem_destroy(&wc.sem);
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90
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91 return 0;
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92 }
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93
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94
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95 TEST_IMPL(semaphore_3) {
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96 uv_sem_t sem;
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97
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98 ASSERT_OK(uv_sem_init(&sem, 3));
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99 uv_sem_wait(&sem); /* should not block */
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100 uv_sem_wait(&sem); /* should not block */
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101 ASSERT_OK(uv_sem_trywait(&sem));
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102 ASSERT_EQ(UV_EAGAIN, uv_sem_trywait(&sem));
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103
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104 uv_sem_post(&sem);
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105 ASSERT_OK(uv_sem_trywait(&sem));
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106 ASSERT_EQ(UV_EAGAIN, uv_sem_trywait(&sem));
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107
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108 uv_sem_destroy(&sem);
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109
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110 return 0;
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111 }
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