pj_mutex.c
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/******************************************************************************
* $Id: pj_transform.c 1504 2009-01-06 02:11:57Z warmerdam $
*
* Project: PROJ.4
* Purpose: Mutex (thread lock) functions.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2009, Frank Warmerdam
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
/* projects.h and windows.h conflict - avoid this! */
#ifndef _WIN32
#include <projects.h>
PJ_CVSID("$Id: pj_transform.c 1504 2009-01-06 02:11:57Z warmerdam $");
#else
#include <proj_api.h>
#endif
#ifdef _WIN32
# define MUTEX_win32
#endif
#if !defined(MUTEX_stub) && !defined(MUTEX_pthread) && !defined(MUTEX_win32)
# define MUTEX_stub
#endif
static void pj_init_lock();
/************************************************************************/
/* ==================================================================== */
/* stub mutex implementation */
/* ==================================================================== */
/************************************************************************/
#ifdef MUTEX_stub
/************************************************************************/
/* pj_acquire_lock() */
/* */
/* Acquire the PROJ.4 lock. */
/************************************************************************/
void pj_acquire_lock()
{
}
/************************************************************************/
/* pj_release_lock() */
/* */
/* Release the PROJ.4 lock. */
/************************************************************************/
void pj_release_lock()
{
}
/************************************************************************/
/* pj_cleanup_lock() */
/************************************************************************/
void pj_cleanup_lock()
{
}
/************************************************************************/
/* pj_init_lock() */
/************************************************************************/
static void pj_init_lock()
{
}
#endif // def MUTEX_stub
/************************************************************************/
/* ==================================================================== */
/* pthread mutex implementation */
/* ==================================================================== */
/************************************************************************/
#ifdef MUTEX_pthread
#include "pthread.h"
static pthread_mutex_t core_lock = PTHREAD_MUTEX_INITIALIZER;
/************************************************************************/
/* pj_acquire_lock() */
/* */
/* Acquire the PROJ.4 lock. */
/************************************************************************/
void pj_acquire_lock()
{
pthread_mutex_lock( &core_lock);
}
/************************************************************************/
/* pj_release_lock() */
/* */
/* Release the PROJ.4 lock. */
/************************************************************************/
void pj_release_lock()
{
pthread_mutex_unlock( &core_lock );
}
/************************************************************************/
/* pj_cleanup_lock() */
/************************************************************************/
void pj_cleanup_lock()
{
}
/************************************************************************/
/* pj_init_lock() */
/************************************************************************/
static void pj_init_lock()
{
}
#endif // def MUTEX_pthread
/************************************************************************/
/* ==================================================================== */
/* win32 mutex implementation */
/* ==================================================================== */
/************************************************************************/
#ifdef MUTEX_win32
#include <windows.h>
static HANDLE mutex_lock = NULL;
/************************************************************************/
/* pj_acquire_lock() */
/* */
/* Acquire the PROJ.4 lock. */
/************************************************************************/
void pj_acquire_lock()
{
if( mutex_lock == NULL )
pj_init_lock();
WaitForSingleObject( mutex_lock, INFINITE );
}
/************************************************************************/
/* pj_release_lock() */
/* */
/* Release the PROJ.4 lock. */
/************************************************************************/
void pj_release_lock()
{
if( mutex_lock == NULL )
pj_init_lock();
ReleaseMutex( mutex_lock );
}
/************************************************************************/
/* pj_cleanup_lock() */
/************************************************************************/
void pj_cleanup_lock()
{
if( mutex_lock != NULL )
{
CloseHandle( mutex_lock );
mutex_lock = NULL;
}
}
/************************************************************************/
/* pj_init_lock() */
/************************************************************************/
static void pj_init_lock()
{
if( mutex_lock == NULL )
mutex_lock = CreateMutex( NULL, TRUE, NULL );
}
#endif // def MUTEX_win32