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/*
//
// Copyright 1997-2009 Torsten Rohlfing
//
// Copyright 2004-2011 SRI International
//
// This file is part of the Computational Morphometry Toolkit.
//
// http://www.nitrc.org/projects/cmtk/
//
// The Computational Morphometry Toolkit is free software: you can
// redistribute it and/or modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// The Computational Morphometry Toolkit is distributed in the hope that it
// will be useful, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with the Computational Morphometry Toolkit. If not, see
// <http://www.gnu.org/licenses/>.
//
// $Revision: 5436 $
//
// $LastChangedDate: 2018-12-10 19:01:20 -0800 (Mon, 10 Dec 2018) $
//
// $LastChangedBy: torstenrohlfing $
//
*/
#ifndef __cmtkMutexLock_h_included_
#define __cmtkMutexLock_h_included_
#include <cmtkconfig.h>
#include <System/cmtkCannotBeCopied.h>
#if defined(CMTK_USE_PTHREADS)
# include <pthread.h>
#endif
#ifdef _MSC_VER
# include <Windows.h>
#endif
namespace
cmtk
{
/** \addtogroup System */
//@{
/** Generic mutex lock.
* This class represents a thread-model independent wrapper for locks on data
* that requires mutually exclusive access.
*/
class MutexLock :
/// Make class uncopyable via inheritance.
private CannotBeCopied
{
public:
/// Constructor: initialize low-level lock.
MutexLock()
{
#if defined(CMTK_USE_PTHREADS)
pthread_mutex_init( &this->m_MutexLock, NULL );
#else
#ifdef _MSC_VER
InitializeCriticalSection( &this->m_MutexObject );
#endif
#endif
}
/// Destructor: clean up low-level lock.
~MutexLock()
{
#if defined(CMTK_USE_PTHREADS)
pthread_mutex_destroy( &this->m_MutexLock );
#else
#ifdef _MSC_VER
DeleteCriticalSection( &this->m_MutexObject );
#endif
#endif
}
/// Lock: if already locked, wait until unlocked, then lock.
void Lock()
{
#if defined(CMTK_USE_PTHREADS)
pthread_mutex_lock( &this->m_MutexLock );
#else
#ifdef _MSC_VER
EnterCriticalSection( &this->m_MutexObject );
#endif
#endif
}
/// Unlock.
void Unlock()
{
#if defined(CMTK_USE_PTHREADS)
pthread_mutex_unlock( &this->m_MutexLock );
#else
#ifdef _MSC_VER
LeaveCriticalSection( &this->m_MutexObject );
#endif
#endif
}
#if defined(CMTK_USE_PTHREADS)
protected:
/** Low-level mutex lock for POSIX threads.
*/
pthread_mutex_t m_MutexLock;
#else
#ifdef _MSC_VER
CRITICAL_SECTION m_MutexObject;
#endif
#endif
};
//@}
} // namespace cmtk
#endif // #ifndef __cmtkMutexLock_h_included_
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