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/*
//
// Copyright 1997-2009 Torsten Rohlfing
//
// Copyright 2004-2010 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 __cmtkThreadSemaphore_h_included_
#define __cmtkThreadSemaphore_h_included_
#include <cmtkconfig.h>
#include <System/cmtkCannotBeCopied.h>
#if defined(CMTK_USE_PTHREADS)
# if defined(__APPLE__) || defined(__CYGWIN__)
# include <pthread.h>
# else
# include <semaphore.h>
# endif
#elif defined(_MSC_VER)
# include <Windows.h>
#endif
namespace
cmtk
{
/** \addtogroup System */
//@{
/** Semaphore for thread synchronization.
* Because apparently Apple engineers are incapable of implementing an interface for unnamed
* semaphores as provided by <semaphore.h>, we are building the semaphore ourselves on the
* Mac OS platform using a mutex and a condition variable.
*/
class ThreadSemaphore :
/// Make class uncopyable via inheritance.
private CannotBeCopied
{
public:
/// Initialize semaphore.
ThreadSemaphore( const unsigned int initial = 0 );
/// Destroy semaphore object.
~ThreadSemaphore();
/// Post semaphore.
void Post( const unsigned int increment = 1 );
/// Wait for semaphore.
void Wait();
#if defined(CMTK_USE_PTHREADS)
# if defined(__APPLE__) || defined(__CYGWIN__)
private:
/// Counter (Apple only).
long int m_Counter;
/// Counter mutex lock (Apple only).
pthread_mutex_t m_Mutex;
/// Condition variable (Apple only).
pthread_cond_t m_Condition;
# else // POSIX
/// Opaque system semaphore object (POSIX only).
sem_t m_Semaphore;
# endif
#elif defined(_MSC_VER)
private:
/// Opaque system semaphore object (Windows native only).
HANDLE m_Semaphore;
#endif
};
//@}
} // namespace cmtk
#endif // #ifndef __cmtkThreadSemaphore_h_included_
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