mutex_posix.h

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//
// Mutex_POSIX.h
//
// $Id: //poco/Main/Foundation/include/Foundation/Mutex_POSIX.h#5 $
//
// Definition of the MutexImp and FastMutexImp classes for POSIX Threads.
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#ifndef Foundation_Mutex_POSIX_INCLUDED
#define Foundation_Mutex_POSIX_INCLUDED


#ifndef Foundation_Foundation_INCLUDED
#include "Foundation/Foundation.h"
#endif
#ifndef Foundation_Exception_INCLUDED
#include "Foundation/Exception.h"
#endif
#ifndef STD_PTHREAD_INCLUDED
#include <pthread.h>
#define STD_PTHREAD_INCLUDED
#endif
#ifndef STD_ERRNO_INCLUDED
#include <errno.h>
#define STD_ERRNO_INCLUDED
#endif


Foundation_BEGIN


class Foundation_API MutexImp
{
protected:
	MutexImp();
	MutexImp(bool fast);
	~MutexImp();
	void lockImp();
	bool tryLockImp();
	void unlockImp();
	
private:
	pthread_mutex_t _mutex;
};


class Foundation_API FastMutexImp: public MutexImp
{
protected:
	FastMutexImp();
	~FastMutexImp();
};


//
// inlines
//
inline void MutexImp::lockImp()
{
	if (pthread_mutex_lock(&_mutex)) 
		throw SystemException("cannot lock mutex");
}


inline bool MutexImp::tryLockImp()
{
	int rc = pthread_mutex_trylock(&_mutex);
	if (rc == 0)
		return true;
	else if (rc == EBUSY)
		return false;
	else
		throw SystemException("cannot lock mutex");

}


inline void MutexImp::unlockImp()
{
	if (pthread_mutex_unlock(&_mutex))
		throw SystemException("cannot unlock mutex");
}


Foundation_END


#endif // Foundation_Mutex_POSIX_INCLUDED