118 lines
2.7 KiB
C++
118 lines
2.7 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Assertions.h>
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#include <errno.h>
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#include <semaphore.h>
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int sem_close(sem_t*)
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{
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errno = ENOSYS;
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return -1;
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}
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int sem_destroy(sem_t* sem)
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{
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pthread_mutex_destroy(&sem->mtx);
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pthread_cond_destroy(&sem->cv);
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return 0;
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}
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int sem_getvalue(sem_t*, int*)
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{
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VERIFY_NOT_REACHED();
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}
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int sem_init(sem_t* sem, int shared, unsigned int value)
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{
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if (shared)
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return ENOSYS;
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if (pthread_mutex_init(&sem->mtx, nullptr) != 0)
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return -1;
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if (pthread_cond_init(&sem->cv, nullptr) != 0)
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return -1;
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sem->value = value;
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return 0;
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}
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sem_t* sem_open(const char*, int, ...)
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{
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errno = ENOSYS;
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return nullptr;
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}
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int sem_post(sem_t* sem)
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{
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sem->value++;
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pthread_cond_signal(&sem->cv);
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pthread_mutex_unlock(&sem->mtx);
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return 0;
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}
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int sem_trywait(sem_t* sem)
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{
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if (pthread_mutex_lock(&sem->mtx) != 0)
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return -1;
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if (sem->value == 0) {
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pthread_mutex_unlock(&sem->mtx);
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errno = EAGAIN;
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return -1;
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}
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sem->value--;
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return 0;
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}
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int sem_unlink(const char*)
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{
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return ENOSYS;
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}
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int sem_wait(sem_t* sem)
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{
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if (pthread_mutex_lock(&sem->mtx) != 0)
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return -1;
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while (sem->value == 0) {
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if (pthread_cond_wait(&sem->cv, &sem->mtx) != 0) {
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pthread_mutex_unlock(&sem->mtx);
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return -1;
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}
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}
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sem->value--;
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return 0;
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}
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