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Semaphore.cpp
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86 lines (75 loc) · 1.7 KB
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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
// The only user of Semaphore.h is SamplingProfiler, which is stubbed out
// in Windows. As a result, it is unnecessary to implement Semaphore on Windows.
#ifndef _WINDOWS
#include "hermes/Support/Semaphore.h"
#include <assert.h>
#include <cstdio>
#include <string>
namespace hermes {
sem_t *Semaphore::getSemaphorePtr() {
#ifdef __APPLE__
return semPtr_;
#else
return &sem_;
#endif
}
bool Semaphore::open(const char *semaphoreName) {
#ifdef __APPLE__
// Create named semaphore with read/write.
semPtr_ = sem_open(semaphoreName, O_CREAT, S_IRUSR | S_IWUSR, /*value*/ 0);
if (semPtr_ == SEM_FAILED) {
perror("sem_open");
return false;
}
assert(semPtr_ != nullptr && "sem_open should have succeeded");
if (sem_unlink(semaphoreName) != 0) {
perror("sem_unlink");
return false;
}
#else
auto ret = sem_init(&sem_, /*pshared*/ 0, /*value*/ 0);
if (ret != 0) {
perror("sem_init");
return false;
}
#endif
return true;
}
bool Semaphore::close() {
#ifdef __APPLE__
if (sem_close(semPtr_) != 0) {
perror("sem_close");
return false;
}
#else
if (sem_destroy(&sem_) != 0) {
perror("sem_destroy");
return false;
}
#endif
return true;
}
bool Semaphore::notifyOne() {
int ret = sem_post(getSemaphorePtr());
if (ret != 0) {
perror("sem_post");
return false;
}
return true;
}
bool Semaphore::wait() {
int ret = sem_wait(getSemaphorePtr());
if (ret != 0) {
perror("sem_wait");
return false;
}
return true;
}
} // namespace hermes
#endif // not _WINDOWS