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260 lines
6.9 KiB
260 lines
6.9 KiB
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <semaphore.h>
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#include <errno.h>
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#include <limits.h>
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#include <pthread.h>
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#include <time.h>
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#include <unistd.h>
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#include <android-base/silent_death_test.h>
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#include <gtest/gtest.h>
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#include "SignalUtils.h"
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#include "private/bionic_constants.h"
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using semaphore_DeathTest = SilentDeathTest;
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TEST(semaphore, sem_init) {
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sem_t s;
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// Perfectly fine initial values.
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ASSERT_EQ(0, sem_init(&s, 0, 0));
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ASSERT_EQ(0, sem_init(&s, 0, 1));
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ASSERT_EQ(0, sem_init(&s, 0, 123));
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// Too small an initial value.
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errno = 0;
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ASSERT_EQ(-1, sem_init(&s, 0, -1));
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ASSERT_EQ(EINVAL, errno);
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ASSERT_EQ(SEM_VALUE_MAX, sysconf(_SC_SEM_VALUE_MAX));
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// The largest initial value.
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ASSERT_EQ(0, sem_init(&s, 0, SEM_VALUE_MAX));
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// Too large an initial value.
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errno = 0;
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ASSERT_EQ(-1, sem_init(&s, 0, SEM_VALUE_MAX + 1));
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ASSERT_EQ(EINVAL, errno);
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ASSERT_EQ(0, sem_destroy(&s));
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}
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TEST(semaphore, sem_trywait) {
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sem_t s;
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ASSERT_EQ(0, sem_init(&s, 0, 3));
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ASSERT_EQ(0, sem_trywait(&s));
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ASSERT_EQ(0, sem_trywait(&s));
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ASSERT_EQ(0, sem_trywait(&s));
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errno = 0;
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ASSERT_EQ(-1, sem_trywait(&s));
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ASSERT_EQ(EAGAIN, errno);
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ASSERT_EQ(0, sem_destroy(&s));
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}
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static void SemWaitThreadTestFn(sem_t& sem) {
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ASSERT_EQ(0, sem_wait(&sem));
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}
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static void* SemWaitThreadFn(void* arg) {
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SemWaitThreadTestFn(*reinterpret_cast<sem_t*>(arg));
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return nullptr;
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}
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TEST(semaphore, sem_wait__sem_post) {
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sem_t s;
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ASSERT_EQ(0, sem_init(&s, 0, 0));
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pthread_t t1, t2, t3;
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ASSERT_EQ(0, pthread_create(&t1, nullptr, SemWaitThreadFn, &s));
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ASSERT_EQ(0, pthread_create(&t2, nullptr, SemWaitThreadFn, &s));
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ASSERT_EQ(0, pthread_create(&t3, nullptr, SemWaitThreadFn, &s));
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ASSERT_EQ(0, sem_post(&s));
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ASSERT_EQ(0, sem_post(&s));
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ASSERT_EQ(0, sem_post(&s));
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void* result;
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ASSERT_EQ(0, pthread_join(t1, &result));
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ASSERT_EQ(0, pthread_join(t2, &result));
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ASSERT_EQ(0, pthread_join(t3, &result));
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}
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static inline void timespec_add_ms(timespec& ts, size_t ms) {
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ts.tv_sec += ms / 1000;
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ts.tv_nsec += (ms % 1000) * 1000000;
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if (ts.tv_nsec >= NS_PER_S) {
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ts.tv_sec++;
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ts.tv_nsec -= NS_PER_S;
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}
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}
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static void sem_timedwait_helper(clockid_t clock,
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int (*wait_function)(sem_t* __sem, const timespec* __ts)) {
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sem_t s;
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ASSERT_EQ(0, sem_init(&s, 0, 0));
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timespec ts;
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ASSERT_EQ(0, clock_gettime(clock, &ts));
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timespec_add_ms(ts, 100);
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errno = 0;
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ASSERT_EQ(-1, wait_function(&s, &ts));
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ASSERT_EQ(ETIMEDOUT, errno);
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// A negative timeout is an error.
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errno = 0;
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ts.tv_nsec = -1;
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ASSERT_EQ(-1, wait_function(&s, &ts));
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ASSERT_EQ(EINVAL, errno);
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errno = 0;
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ts.tv_nsec = NS_PER_S;
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ASSERT_EQ(-1, wait_function(&s, &ts));
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ASSERT_EQ(EINVAL, errno);
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errno = 0;
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ts.tv_nsec = NS_PER_S - 1;
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ts.tv_sec = -1;
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ASSERT_EQ(-1, wait_function(&s, &ts));
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ASSERT_EQ(ETIMEDOUT, errno);
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ASSERT_EQ(0, sem_destroy(&s));
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}
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TEST(semaphore, sem_timedwait) {
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sem_timedwait_helper(CLOCK_REALTIME, sem_timedwait);
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}
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TEST(semaphore, sem_timedwait_monotonic_np) {
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#if defined(__BIONIC__)
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sem_timedwait_helper(CLOCK_MONOTONIC, sem_timedwait_monotonic_np);
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#else // __BIONIC__
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GTEST_SKIP() << "sem_timedwait_monotonic_np is only supported on bionic";
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#endif // __BIONIC__
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}
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TEST(semaphore, sem_clockwait) {
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#if defined(__BIONIC__)
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sem_timedwait_helper(CLOCK_MONOTONIC, [](sem_t* __sem, const timespec* __ts) {
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return sem_clockwait(__sem, CLOCK_MONOTONIC, __ts);
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});
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sem_timedwait_helper(CLOCK_REALTIME, [](sem_t* __sem, const timespec* __ts) {
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return sem_clockwait(__sem, CLOCK_REALTIME, __ts);
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});
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#else // __BIONIC__
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GTEST_SKIP() << "sem_clockwait is only supported on bionic";
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#endif // __BIONIC__
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}
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TEST_F(semaphore_DeathTest, sem_timedwait_null_timeout) {
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sem_t s;
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ASSERT_EQ(0, sem_init(&s, 0, 0));
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ASSERT_EXIT(sem_timedwait(&s, nullptr), testing::KilledBySignal(SIGSEGV), "");
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}
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TEST(semaphore, sem_getvalue) {
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sem_t s;
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ASSERT_EQ(0, sem_init(&s, 0, 0));
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int i;
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ASSERT_EQ(0, sem_getvalue(&s, &i));
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ASSERT_EQ(0, i);
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ASSERT_EQ(0, sem_post(&s));
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ASSERT_EQ(0, sem_getvalue(&s, &i));
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ASSERT_EQ(1, i);
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ASSERT_EQ(0, sem_post(&s));
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ASSERT_EQ(0, sem_getvalue(&s, &i));
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ASSERT_EQ(2, i);
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ASSERT_EQ(0, sem_wait(&s));
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ASSERT_EQ(0, sem_getvalue(&s, &i));
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ASSERT_EQ(1, i);
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}
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extern "C" void android_set_application_target_sdk_version(int target);
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static void sem_wait_test_signal_handler(int) {
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}
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static void* SemWaitEINTRThreadFn(void* arg) {
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sem_t* sem = reinterpret_cast<sem_t*>(arg);
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uintptr_t have_eintr = 0;
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uintptr_t have_error = 0;
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while (true) {
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int result = sem_wait(sem);
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if (result == 0) {
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break;
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}
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if (result == -1) {
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if (errno == EINTR) {
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have_eintr = 1;
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} else {
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have_error = 1;
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break;
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}
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}
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}
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return reinterpret_cast<void*>((have_eintr << 1) | have_error);
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}
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TEST(semaphore, sem_wait_no_EINTR_in_sdk_less_equal_than_23) {
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#if defined(__BIONIC__)
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android_set_application_target_sdk_version(23);
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sem_t s;
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ASSERT_EQ(0, sem_init(&s, 0, 0));
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ScopedSignalHandler handler(SIGUSR1, sem_wait_test_signal_handler);
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pthread_t thread;
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ASSERT_EQ(0, pthread_create(&thread, nullptr, SemWaitEINTRThreadFn, &s));
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// Give some time for the thread to run sem_wait.
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usleep(500000);
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ASSERT_EQ(0, pthread_kill(thread, SIGUSR1));
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// Give some time for the thread to handle signal.
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usleep(500000);
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ASSERT_EQ(0, sem_post(&s));
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void* result;
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ASSERT_EQ(0, pthread_join(thread, &result));
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ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(result));
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#else
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GTEST_SKIP() << "This test tests sem_wait's compatibility for old sdk versions";
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#endif
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}
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TEST(semaphore, sem_wait_EINTR_in_sdk_greater_than_23) {
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#if defined(__BIONIC__)
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android_set_application_target_sdk_version(24U);
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#endif
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sem_t s;
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ASSERT_EQ(0, sem_init(&s, 0, 0));
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ScopedSignalHandler handler(SIGUSR1, sem_wait_test_signal_handler);
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pthread_t thread;
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ASSERT_EQ(0, pthread_create(&thread, nullptr, SemWaitEINTRThreadFn, &s));
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// Give some time for the thread to run sem_wait.
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usleep(500000);
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ASSERT_EQ(0, pthread_kill(thread, SIGUSR1));
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// Give some time for the thread to handle signal.
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usleep(500000);
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ASSERT_EQ(0, sem_post(&s));
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void* result;
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ASSERT_EQ(0, pthread_join(thread, &result));
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ASSERT_EQ(2U, reinterpret_cast<uintptr_t>(result));
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}
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