MSemaphore.h

//========================================================================================
// 
// $File$
// 
// Owner: Lonnie Millett
// 
// $Author$
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// Copyright 1997-2010 Adobe Systems Incorporated. All rights reserved.
// 
// NOTICE: Adobe permits you to use, modify, and distribute this file in accordance 
// with the terms of the Adobe license agreement accompanying it. If you have received
// this file from a source other than Adobe, then your use, modification, or 
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//========================================================================================

#ifndef __MSemaphore__
#define __MSemaphore__

#include <pthread.h>

namespace ID {

//========================================================================================
// CLASS MSemaphore
//========================================================================================

class MSemaphore
{
public:
 MSemaphore(const uint32& initialCount);
 ~MSemaphore();

 void Acquire();
 void Relinquish();

private:
 uint32 fCount; // Current count of the semaphore.
 uint32 fWaitersCount; // Number of threads that have called <sema_wait>. 
 pthread_mutex_t fLock; // Serialize access to <count_> and <waiters_count_>.
 pthread_cond_t fCountNonzero; // Condition variable that blocks the <count_> 0.
};

}

#endif