204 lines
5.0 KiB
C
204 lines
5.0 KiB
C
/*
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* Copyright (C) 2010-2011 Mamadou Diop.
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*
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* Contact: Mamadou Diop <diopmamadou(at)doubango.org>
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*
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* This file is part of Open Source Doubango Framework.
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*
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* DOUBANGO is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* DOUBANGO is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with DOUBANGO.
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*
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*/
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/**@file tsk_semaphore.c
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* @brief Pthread/Windows Semaphore utility functions.
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*
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* @author Mamadou Diop <diopmamadou(at)doubango.org>
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*
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* @date Created: Sat Nov 8 16:54:58 2009 mdiop
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*/
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#include "tsk_semaphore.h"
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#include "tsk_memory.h"
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#include "tsk_debug.h"
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#include "tsk_string.h"
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/* Apple claims that they fully support POSIX semaphore but ...
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*/
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#if defined(__APPLE__) /* Mac OSX/Darwin/Iphone/Ipod Touch */
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# define TSK_USE_NAMED_SEM 1
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#else
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# define TSK_USE_NAMED_SEM 0
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#endif
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#if TSK_UNDER_WINDOWS /* Windows XP/Vista/7/CE */
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# include <windows.h>
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# include "tsk_errno.h"
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# define SEMAPHORE_S void
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typedef HANDLE SEMAPHORE_T;
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//#else if define(__APPLE__) /* Mac OSX/Darwin/Iphone/Ipod Touch */
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//# include <march/semaphore.h>
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//# include <march/task.h>
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#else /* All *nix */
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# include <pthread.h>
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# include <semaphore.h>
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# if TSK_USE_NAMED_SEM
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# include <fcntl.h> /* O_CREAT */
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# include <sys/stat.h> /* S_IRUSR, S_IWUSR*/
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static int sem_count = 0;
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typedef struct named_sem_s
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{
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sem_t* sem;
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char* name;
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} named_sem_t;
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# define SEMAPHORE_S named_sem_t
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# define GET_SEM(PSEM) (((named_sem_t*)(PSEM))->sem)
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# else
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# define SEMAPHORE_S sem_t
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# define GET_SEM(PSEM) ((PSEM))
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# endif /* TSK_USE_NAMED_SEM */
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typedef sem_t* SEMAPHORE_T;
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#endif
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#if defined(__GNUC__) || defined(__SYMBIAN32__)
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# include <errno.h>
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#endif
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/**@defgroup tsk_semaphore_group Pthread/Windows Semaphore functions.
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*/
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/**@ingroup tsk_semaphore_group
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* Creates new semaphore handle.
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* @retval A New semaphore handle.
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* You MUST call @ref tsk_semaphore_destroy to free the semaphore.
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* @sa @ref tsk_semaphore_destroy
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*/
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tsk_semaphore_handle_t* tsk_semaphore_create()
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{
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return tsk_semaphore_create_2(0);
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}
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tsk_semaphore_handle_t* tsk_semaphore_create_2(int initial_val)
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{
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SEMAPHORE_T handle = 0;
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#if TSK_UNDER_WINDOWS
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handle = CreateSemaphore(NULL, initial_val, 0x7FFFFFFF, NULL);
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#else
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handle = tsk_calloc(1, sizeof(SEMAPHORE_S));
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#if TSK_USE_NAMED_SEM
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named_sem_t * nsem = (named_sem_t*)handle;
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tsk_sprintf(&(nsem->name), "/sem-%d", sem_count++);
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if((nsem->sem = sem_open(nsem->name, O_CREAT /*| O_EXCL*/, S_IRUSR | S_IWUSR, initial_val)) == SEM_FAILED)
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{
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TSK_FREE(nsem->name);
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#else
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if(sem_init((SEMAPHORE_T)handle, 0, initial_val))
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{
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#endif
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TSK_FREE(handle);
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TSK_DEBUG_ERROR("Failed to initialize the new semaphore (errno=%d).", errno);
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}
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#endif
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if(!handle){
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TSK_DEBUG_ERROR("Failed to create new semaphore");
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}
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return handle;
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}
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/**@ingroup tsk_semaphore_group
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* Increments a semaphore.
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* @param handle The semaphore to increment.
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* @retval Zero if succeed and otherwise the function returns -1 and sets errno to indicate the error.
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* @sa @ref tsk_semaphore_decrement.
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*/
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int tsk_semaphore_increment(tsk_semaphore_handle_t* handle)
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{
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int ret = EINVAL;
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if(handle)
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{
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#if TSK_UNDER_WINDOWS
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if((ret = ReleaseSemaphore((SEMAPHORE_T)handle, 1L, 0L) ? 0 : -1))
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#else
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if(ret = sem_post((SEMAPHORE_T)GET_SEM(handle)))
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#endif
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{
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TSK_DEBUG_ERROR("sem_post function failed: %d", ret);
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}
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}
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return ret;
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}
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/**@ingroup tsk_semaphore_group
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* Decrements a semaphore.
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* @param handle The semaphore to decrement.
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* @retval Zero if succeed and otherwise the function returns -1 and sets errno to indicate the error.
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* @sa @ref tsk_semaphore_increment.
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*/
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int tsk_semaphore_decrement(tsk_semaphore_handle_t* handle)
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{
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int ret = EINVAL;
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if(handle)
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{
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#if TSK_UNDER_WINDOWS
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ret = (WaitForSingleObject((SEMAPHORE_T)handle, INFINITE) == WAIT_OBJECT_0 ? 0 : -1);
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if(ret) TSK_DEBUG_ERROR("sem_wait function failed: %d", ret);
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#else
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do
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{
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ret = sem_wait((SEMAPHORE_T)GET_SEM(handle));
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}
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while ( errno == EINTR );
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if(ret) TSK_DEBUG_ERROR("sem_wait function failed: %d", errno);
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#endif
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}
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return ret;
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}
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/**@ingroup tsk_semaphore_group
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* Destroy a semaphore previously created using @ref tsk_semaphore_create.
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* @param handle The semaphore to free.
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* @sa @ref tsk_semaphore_create
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*/
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void tsk_semaphore_destroy(tsk_semaphore_handle_t** handle)
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{
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if(handle && *handle)
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{
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#if TSK_UNDER_WINDOWS
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CloseHandle((SEMAPHORE_T)*handle);
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*handle = tsk_null;
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#else
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# if TSK_USE_NAMED_SEM
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named_sem_t * nsem = ((named_sem_t*)*handle);
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sem_close(nsem->sem);
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TSK_FREE(nsem->name);
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#else
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sem_destroy((SEMAPHORE_T)GET_SEM(*handle));
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#endif /* TSK_USE_NAMED_SEM */
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tsk_free(handle);
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#endif
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}
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else{
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TSK_DEBUG_WARN("Cannot free an uninitialized semaphore object");
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}
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}
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