81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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* drawElements Thread Library
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* ---------------------------
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*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*//*!
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* \file
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* \brief Mach implementation of semaphore.
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*//*--------------------------------------------------------------------*/
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#include "deSemaphore.h"
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#if (DE_OS == DE_OS_IOS || DE_OS == DE_OS_OSX)
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#include "deMemory.h"
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#include <mach/semaphore.h>
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#include <mach/task.h>
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#include <mach/mach_init.h>
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DE_STATIC_ASSERT(sizeof(deSemaphore) >= sizeof(semaphore_t));
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deSemaphore deSemaphore_create (int initialValue, const deSemaphoreAttributes* attributes)
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{
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semaphore_t sem;
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DE_UNREF(attributes);
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DE_ASSERT(initialValue >= 0);
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if (semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, initialValue) != KERN_SUCCESS)
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return 0;
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return (deSemaphore)sem;
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}
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void deSemaphore_destroy (deSemaphore semaphore)
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{
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semaphore_t sem = (semaphore_t)semaphore;
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kern_return_t res = semaphore_destroy(mach_task_self(), sem);
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DE_ASSERT(res == 0);
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DE_UNREF(res);
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}
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void deSemaphore_increment (deSemaphore semaphore)
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{
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semaphore_t sem = (semaphore_t)semaphore;
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kern_return_t res = semaphore_signal(sem);
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DE_ASSERT(res == 0);
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DE_UNREF(res);
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}
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void deSemaphore_decrement (deSemaphore semaphore)
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{
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semaphore_t sem = (semaphore_t)semaphore;
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kern_return_t res = semaphore_wait(sem);
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DE_ASSERT(res == 0);
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DE_UNREF(res);
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}
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deBool deSemaphore_tryDecrement (deSemaphore semaphore)
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{
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semaphore_t sem = (semaphore_t)semaphore;
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mach_timespec_t ts = { 0, 1 }; /* one nanosecond */
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return (semaphore_timedwait(sem, ts) == KERN_SUCCESS);
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}
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#endif /* DE_OS */
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