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///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2005-2012, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// *       Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// *       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.
// *       Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
// 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 INCLUDED_ILM_THREAD_SEMAPHORE_H
#define INCLUDED_ILM_THREAD_SEMAPHORE_H

//-----------------------------------------------------------------------------
//
//	class Semaphore -- a wrapper class for
//	system-dependent counting semaphores
//
//-----------------------------------------------------------------------------

#include "IlmBaseConfig.h"
#include "IlmThreadExport.h"
#include "IlmThreadNamespace.h"

#if defined _WIN32 || defined _WIN64
#   ifdef NOMINMAX
#      undef NOMINMAX
#   endif
#   define NOMINMAX
#   include <windows.h>
#endif

#ifdef HAVE_POSIX_SEMAPHORES
#   include <semaphore.h>
#elif defined(__APPLE__)
#   include <dispatch/dispatch.h>
#else
#   ifdef ILMBASE_FORCE_CXX03
#      ifdef HAVE_PTHREAD
#         include <pthread.h>
#      endif
#   else
#      include <mutex>
#      include <condition_variable>
#   endif
#endif

ILMTHREAD_INTERNAL_NAMESPACE_HEADER_ENTER

class ILMTHREAD_EXPORT Semaphore
{
  public:

Semaphore (unsigned int value = 0);
    virtual ~Semaphore();

void	wait();
    bool	tryWait();
    void	post();
    int		value() const;

private:

#if (defined (_WIN32) || defined (_WIN64)) && !defined (HAVE_POSIX_SEMAPHORES)

mutable HANDLE _semaphore;

#elif defined(HAVE_POSIX_SEMAPHORES)

mutable sem_t _semaphore;

#elif defined(__APPLE__)
	mutable dispatch_semaphore_t _semaphore;

#else
	//
	// If the platform has Posix threads but no semapohores,
	// then we implement them ourselves using condition variables
	//

struct sema_t
	{
	    unsigned int count;
	    unsigned long numWaiting;
#   if ILMBASE_FORCE_CXX03
#      if HAVE_PTHREAD
	    pthread_mutex_t mutex;
	    pthread_cond_t nonZero;
#      else
#         error unhandled legacy setup
#      endif
#   else
        std::mutex mutex;
        std::condition_variable nonZero;
#   endif
	};

mutable sema_t _semaphore;
  
#endif

void operator = (const Semaphore& s);	// not implemented
    Semaphore (const Semaphore& s);		// not implemented
};

ILMTHREAD_INTERNAL_NAMESPACE_HEADER_EXIT

#endif // INCLUDED_ILM_THREAD_SEMAPHORE_H