| /*------------------------------------------------------------------------- |
| * 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 using named semaphores. |
| *//*--------------------------------------------------------------------*/ |
| |
| #include "deSemaphore.h" |
| |
| #if (DE_OS == DE_OS_IOS || DE_OS == DE_OS_OSX) |
| |
| #include "deMemory.h" |
| #include "deString.h" |
| |
| #include <semaphore.h> |
| #include <unistd.h> |
| |
| typedef struct NamedSemaphore_s |
| { |
| sem_t* semaphore; |
| } NamedSemaphore; |
| |
| static void NamedSemaphore_getName (const NamedSemaphore* sem, char* buf, int bufSize) |
| { |
| deSprintf(buf, bufSize, "/desem-%d-%p", getpid(), (void*)sem); |
| } |
| |
| DE_STATIC_ASSERT(sizeof(deSemaphore) >= sizeof(NamedSemaphore*)); |
| |
| deSemaphore deSemaphore_create (int initialValue, const deSemaphoreAttributes* attributes) |
| { |
| NamedSemaphore* sem = (NamedSemaphore*)deCalloc(sizeof(NamedSemaphore)); |
| char name[128]; |
| deUint32 mode = 0700; |
| |
| DE_UNREF(attributes); |
| |
| if (!sem) |
| return 0; |
| |
| NamedSemaphore_getName(sem, name, DE_LENGTH_OF_ARRAY(name)); |
| |
| sem->semaphore = sem_open(name, O_CREAT|O_EXCL, mode, initialValue); |
| |
| if (sem->semaphore == SEM_FAILED) |
| { |
| deFree(sem); |
| return 0; |
| } |
| |
| return (deSemaphore)sem; |
| } |
| |
| void deSemaphore_destroy (deSemaphore semaphore) |
| { |
| NamedSemaphore* sem = (NamedSemaphore*)semaphore; |
| char name[128]; |
| int res; |
| |
| NamedSemaphore_getName(sem, name, DE_LENGTH_OF_ARRAY(name)); |
| |
| res = sem_close(sem->semaphore); |
| DE_ASSERT(res == 0); |
| res = sem_unlink(name); |
| DE_ASSERT(res == 0); |
| DE_UNREF(res); |
| deFree(sem); |
| } |
| |
| void deSemaphore_increment (deSemaphore semaphore) |
| { |
| sem_t* sem = ((NamedSemaphore*)semaphore)->semaphore; |
| int res = sem_post(sem); |
| DE_ASSERT(res == 0); |
| DE_UNREF(res); |
| } |
| |
| void deSemaphore_decrement (deSemaphore semaphore) |
| { |
| sem_t* sem = ((NamedSemaphore*)semaphore)->semaphore; |
| int res = sem_wait(sem); |
| DE_ASSERT(res == 0); |
| DE_UNREF(res); |
| } |
| |
| deBool deSemaphore_tryDecrement (deSemaphore semaphore) |
| { |
| sem_t* sem = ((NamedSemaphore*)semaphore)->semaphore; |
| return (sem_trywait(sem) == 0); |
| } |
| |
| #endif /* DE_OS */ |