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/******************************************************************************
*
* Purpose: Implementation of pthreads based mutex.
*
******************************************************************************
* Copyright (c) 2009
* PCI Geomatics, 50 West Wilmot Street, Richmond Hill, Ont, Canada
*
* 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.
****************************************************************************/
#include "pcidsk_mutex.h"
#include <pthread.h>
#include <cstdlib>
/************************************************************************/
/* PThreadMutex */
/************************************************************************/
class PThreadMutex : public PCIDSK::Mutex
{
private:
pthread_mutex_t *hMutex;
public:
PThreadMutex();
~PThreadMutex();
int Acquire(void);
int Release(void);
};
/************************************************************************/
/* PThreadMutex() */
/************************************************************************/
PThreadMutex::PThreadMutex()
{
hMutex = (pthread_mutex_t *) malloc(sizeof(pthread_mutex_t));
#if defined(PTHREAD_MUTEX_RECURSIVE)
{
pthread_mutexattr_t attr;
pthread_mutexattr_init( &attr );
pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
pthread_mutex_init( hMutex, &attr );
}
#elif defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
pthread_mutex_t tmp_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
*hMutex = tmp_mutex;
#else
#error "Recursive mutexes apparently unsupported, configure --without-threads"
#endif
}
/************************************************************************/
/* ~PThreadMutex() */
/************************************************************************/
PThreadMutex::~PThreadMutex()
{
pthread_mutex_destroy( hMutex );
free( hMutex );
}
/************************************************************************/
/* Release() */
/************************************************************************/
int PThreadMutex::Release()
{
pthread_mutex_unlock( hMutex );
return 1;
}
/************************************************************************/
/* Acquire() */
/************************************************************************/
int PThreadMutex::Acquire()
{
return pthread_mutex_lock( hMutex ) == 0;
}
/************************************************************************/
/* DefaultCreateMutex() */
/************************************************************************/
/**
* Create a mutex.
*
* This function creates the default style of mutex for the currently
* PCIDSK library build. The mutex should be destroyed with delete when
* no longer required.
*
* @return a new mutex object pointer.
*/
PCIDSK::Mutex *PCIDSK::DefaultCreateMutex(void)
{
return new PThreadMutex();
}
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