1 /*------------------------------------------------------------------------- 2 * drawElements Thread Library 3 * --------------------------- 4 * 5 * Copyright 2014 The Android Open Source Project 6 * 7 * Licensed under the Apache License, Version 2.0 (the "License"); 8 * you may not use this file except in compliance with the License. 9 * You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 * 19 *//*! 20 * \file 21 * \brief Unix implementation of semaphore. 22 *//*--------------------------------------------------------------------*/ 23 24 #include "deSemaphore.h" 25 26 #if (DE_OS == DE_OS_UNIX || DE_OS == DE_OS_ANDROID || DE_OS == DE_OS_SYMBIAN || DE_OS == DE_OS_QNX) || \ 27 (DE_OS == DE_OS_FUCHSIA) 28 29 #include "deMemory.h" 30 31 #include <semaphore.h> 32 33 DE_STATIC_ASSERT(sizeof(deSemaphore) >= sizeof(sem_t *)); 34 deSemaphore_create(int initialValue,const deSemaphoreAttributes * attributes)35deSemaphore deSemaphore_create(int initialValue, const deSemaphoreAttributes *attributes) 36 { 37 sem_t *sem = (sem_t *)deMalloc(sizeof(sem_t)); 38 39 DE_UNREF(attributes); 40 DE_ASSERT(initialValue >= 0); 41 42 if (!sem) 43 return 0; 44 45 if (sem_init(sem, 0, (unsigned int)initialValue) != 0) 46 { 47 deFree(sem); 48 return 0; 49 } 50 51 return (deSemaphore)sem; 52 } 53 deSemaphore_destroy(deSemaphore semaphore)54void deSemaphore_destroy(deSemaphore semaphore) 55 { 56 sem_t *sem = (sem_t *)semaphore; 57 DE_ASSERT(sem); 58 sem_destroy(sem); 59 deFree(sem); 60 } 61 deSemaphore_increment(deSemaphore semaphore)62void deSemaphore_increment(deSemaphore semaphore) 63 { 64 sem_t *sem = (sem_t *)semaphore; 65 int ret = sem_post(sem); 66 DE_ASSERT(ret == 0); 67 DE_UNREF(ret); 68 } 69 deSemaphore_decrement(deSemaphore semaphore)70void deSemaphore_decrement(deSemaphore semaphore) 71 { 72 sem_t *sem = (sem_t *)semaphore; 73 int ret = sem_wait(sem); 74 DE_ASSERT(ret == 0); 75 DE_UNREF(ret); 76 } 77 deSemaphore_tryDecrement(deSemaphore semaphore)78bool deSemaphore_tryDecrement(deSemaphore semaphore) 79 { 80 sem_t *sem = (sem_t *)semaphore; 81 DE_ASSERT(sem); 82 return (sem_trywait(sem) == 0); 83 } 84 85 #endif /* DE_OS */ 86