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 DE_ASSERT(initialValue >= 0); 40 41 if (!sem) 42 return 0; 43 44 if (sem_init(sem, 0, (unsigned int)initialValue) != 0) 45 { 46 deFree(sem); 47 return 0; 48 } 49 50 return (deSemaphore)sem; 51 } 52 53 void deSemaphore_destroy (deSemaphore semaphore) 54 { 55 sem_t* sem = (sem_t*)semaphore; 56 DE_ASSERT(sem); 57 sem_destroy(sem); 58 deFree(sem); 59 } 60 61 void deSemaphore_increment (deSemaphore semaphore) 62 { 63 sem_t* sem = (sem_t*)semaphore; 64 int ret = sem_post(sem); 65 DE_ASSERT(ret == 0); 66 DE_UNREF(ret); 67 } 68 69 void deSemaphore_decrement (deSemaphore semaphore) 70 { 71 sem_t* sem = (sem_t*)semaphore; 72 int ret = sem_wait(sem); 73 DE_ASSERT(ret == 0); 74 DE_UNREF(ret); 75 } 76 77 deBool deSemaphore_tryDecrement (deSemaphore semaphore) 78 { 79 sem_t* sem = (sem_t*)semaphore; 80 DE_ASSERT(sem); 81 return (sem_trywait(sem) == 0); 82 } 83 84 #endif /* DE_OS */ 85
