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