semaphore_test.cpp revision c9a659c57b256001fd63f9825bde69e660c2655b 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <semaphore.h>
18
19#include <errno.h>
20#include <gtest/gtest.h>
21#include <limits.h>
22#include <pthread.h>
23#include <time.h>
24#include <unistd.h>
25
26#include "private/bionic_constants.h"
27
28TEST(semaphore, sem_init) {
29  sem_t s;
30
31  // Perfectly fine initial values.
32  ASSERT_EQ(0, sem_init(&s, 0, 0));
33  ASSERT_EQ(0, sem_init(&s, 0, 1));
34  ASSERT_EQ(0, sem_init(&s, 0, 123));
35
36  // Too small an initial value.
37  errno = 0;
38  ASSERT_EQ(-1, sem_init(&s, 0, -1));
39  ASSERT_EQ(EINVAL, errno);
40
41  ASSERT_EQ(SEM_VALUE_MAX, sysconf(_SC_SEM_VALUE_MAX));
42
43  // The largest initial value.
44  ASSERT_EQ(0, sem_init(&s, 0, SEM_VALUE_MAX));
45
46  // Too large an initial value.
47  errno = 0;
48  ASSERT_EQ(-1, sem_init(&s, 0, SEM_VALUE_MAX + 1));
49  ASSERT_EQ(EINVAL, errno);
50
51  ASSERT_EQ(0, sem_destroy(&s));
52}
53
54TEST(semaphore, sem_trywait) {
55  sem_t s;
56  ASSERT_EQ(0, sem_init(&s, 0, 3));
57  ASSERT_EQ(0, sem_trywait(&s));
58  ASSERT_EQ(0, sem_trywait(&s));
59  ASSERT_EQ(0, sem_trywait(&s));
60  errno = 0;
61  ASSERT_EQ(-1, sem_trywait(&s));
62  ASSERT_EQ(EAGAIN, errno);
63  ASSERT_EQ(0, sem_destroy(&s));
64}
65
66static void SemWaitThreadTestFn(sem_t& sem) {
67  ASSERT_EQ(0, sem_wait(&sem));
68}
69
70static void* SemWaitThreadFn(void* arg) {
71  SemWaitThreadTestFn(*reinterpret_cast<sem_t*>(arg));
72  return nullptr;
73}
74
75TEST(semaphore, sem_wait__sem_post) {
76  sem_t s;
77  ASSERT_EQ(0, sem_init(&s, 0, 0));
78
79  pthread_t t1, t2, t3;
80  ASSERT_EQ(0, pthread_create(&t1, NULL, SemWaitThreadFn, &s));
81  ASSERT_EQ(0, pthread_create(&t2, NULL, SemWaitThreadFn, &s));
82  ASSERT_EQ(0, pthread_create(&t3, NULL, SemWaitThreadFn, &s));
83
84  ASSERT_EQ(0, sem_post(&s));
85  ASSERT_EQ(0, sem_post(&s));
86  ASSERT_EQ(0, sem_post(&s));
87
88  void* result;
89  ASSERT_EQ(0, pthread_join(t1, &result));
90  ASSERT_EQ(0, pthread_join(t2, &result));
91  ASSERT_EQ(0, pthread_join(t3, &result));
92}
93
94static inline void timespec_add_ms(timespec& ts, size_t ms) {
95  ts.tv_sec  += ms / 1000;
96  ts.tv_nsec += (ms % 1000) * 1000000;
97  if (ts.tv_nsec >= NS_PER_S) {
98    ts.tv_sec++;
99    ts.tv_nsec -= NS_PER_S;
100  }
101}
102
103TEST(semaphore, sem_timedwait) {
104  sem_t s;
105  ASSERT_EQ(0, sem_init(&s, 0, 0));
106
107  timespec ts;
108  ASSERT_EQ(0, clock_gettime(CLOCK_REALTIME, &ts));
109  timespec_add_ms(ts, 100);
110
111  errno = 0;
112  ASSERT_EQ(-1, sem_timedwait(&s, &ts));
113  ASSERT_EQ(ETIMEDOUT, errno);
114
115  // A negative timeout is an error.
116  errno = 0;
117  ts.tv_nsec = -1;
118  ASSERT_EQ(-1, sem_timedwait(&s, &ts));
119  ASSERT_EQ(EINVAL, errno);
120  errno = 0;
121  ts.tv_nsec = NS_PER_S;
122  ASSERT_EQ(-1, sem_timedwait(&s, &ts));
123  ASSERT_EQ(EINVAL, errno);
124
125  errno = 0;
126  ts.tv_nsec = NS_PER_S - 1;
127  ts.tv_sec = -1;
128  ASSERT_EQ(-1, sem_timedwait(&s, &ts));
129  ASSERT_EQ(ETIMEDOUT, errno);
130
131  ASSERT_EQ(0, sem_destroy(&s));
132}
133
134TEST(semaphore, sem_getvalue) {
135  sem_t s;
136  ASSERT_EQ(0, sem_init(&s, 0, 0));
137
138  int i;
139  ASSERT_EQ(0, sem_getvalue(&s, &i));
140  ASSERT_EQ(0, i);
141
142  ASSERT_EQ(0, sem_post(&s));
143  ASSERT_EQ(0, sem_getvalue(&s, &i));
144  ASSERT_EQ(1, i);
145
146  ASSERT_EQ(0, sem_post(&s));
147  ASSERT_EQ(0, sem_getvalue(&s, &i));
148  ASSERT_EQ(2, i);
149
150  ASSERT_EQ(0, sem_wait(&s));
151  ASSERT_EQ(0, sem_getvalue(&s, &i));
152  ASSERT_EQ(1, i);
153}
154