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) 27 28 #include "deMemory.h" 29 30 #include <semaphore.h> 31 32 DE_STATIC_ASSERT(sizeof(deSemaphore) >= sizeof(sem_t*)); 33 34 deSemaphore deSemaphore_create (int initialValue, const deSemaphoreAttributes* attributes) 35 { 36 sem_t* sem = (sem_t*)deMalloc(sizeof(sem_t)); 37 38 DE_UNREF(attributes); 39 40 if (!sem) 41 return 0; 42 43 if (sem_init(sem, 0, initialValue) != 0) 44 { 45 deFree(sem); 46 return 0; 47 } 48 49 return (deSemaphore)sem; 50 } 51 52 void deSemaphore_destroy (deSemaphore semaphore) 53 { 54 sem_t* sem = (sem_t*)semaphore; 55 DE_ASSERT(sem); 56 sem_destroy(sem); 57 deFree(sem); 58 } 59 60 void deSemaphore_increment (deSemaphore semaphore) 61 { 62 sem_t* sem = (sem_t*)semaphore; 63 int ret = sem_post(sem); 64 DE_ASSERT(ret == 0); 65 DE_UNREF(ret); 66 } 67 68 void deSemaphore_decrement (deSemaphore semaphore) 69 { 70 sem_t* sem = (sem_t*)semaphore; 71 int ret = sem_wait(sem); 72 DE_ASSERT(ret == 0); 73 DE_UNREF(ret); 74 } 75 76 deBool deSemaphore_tryDecrement (deSemaphore semaphore) 77 { 78 sem_t* sem = (sem_t*)semaphore; 79 DE_ASSERT(sem); 80 return (sem_trywait(sem) == 0); 81 } 82 83 #endif /* DE_OS */ 84
