| /*------------------------------------------------------------------------- |
| * drawElements Thread Library |
| * --------------------------- |
| * |
| * Copyright 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| *//*! |
| * \file |
| * \brief Unix implementation of semaphore. |
| *//*--------------------------------------------------------------------*/ |
| |
| #include "deSemaphore.h" |
| |
| #if (DE_OS == DE_OS_UNIX || DE_OS == DE_OS_ANDROID || DE_OS == DE_OS_SYMBIAN || DE_OS == DE_OS_QNX) |
| |
| #include "deMemory.h" |
| |
| #include <semaphore.h> |
| |
| DE_STATIC_ASSERT(sizeof(deSemaphore) >= sizeof(sem_t*)); |
| |
| deSemaphore deSemaphore_create (int initialValue, const deSemaphoreAttributes* attributes) |
| { |
| sem_t* sem = (sem_t*)deMalloc(sizeof(sem_t)); |
| |
| DE_UNREF(attributes); |
| DE_ASSERT(initialValue >= 0); |
| |
| if (!sem) |
| return 0; |
| |
| if (sem_init(sem, 0, (unsigned int)initialValue) != 0) |
| { |
| deFree(sem); |
| return 0; |
| } |
| |
| return (deSemaphore)sem; |
| } |
| |
| void deSemaphore_destroy (deSemaphore semaphore) |
| { |
| sem_t* sem = (sem_t*)semaphore; |
| DE_ASSERT(sem); |
| sem_destroy(sem); |
| deFree(sem); |
| } |
| |
| void deSemaphore_increment (deSemaphore semaphore) |
| { |
| sem_t* sem = (sem_t*)semaphore; |
| int ret = sem_post(sem); |
| DE_ASSERT(ret == 0); |
| DE_UNREF(ret); |
| } |
| |
| void deSemaphore_decrement (deSemaphore semaphore) |
| { |
| sem_t* sem = (sem_t*)semaphore; |
| int ret = sem_wait(sem); |
| DE_ASSERT(ret == 0); |
| DE_UNREF(ret); |
| } |
| |
| deBool deSemaphore_tryDecrement (deSemaphore semaphore) |
| { |
| sem_t* sem = (sem_t*)semaphore; |
| DE_ASSERT(sem); |
| return (sem_trywait(sem) == 0); |
| } |
| |
| #endif /* DE_OS */ |