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///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2005-2012, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
// All rights reserved.
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///////////////////////////////////////////////////////////////////////////
#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>
#elif HAVE_PTHREAD && !HAVE_POSIX_SEMAPHORES
#include <pthread.h>
#elif HAVE_PTHREAD && HAVE_POSIX_SEMAPHORES
#include <semaphore.h>
#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
mutable HANDLE _semaphore;
#elif HAVE_PTHREAD && !HAVE_POSIX_SEMAPHORES
//
// 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;
pthread_mutex_t mutex;
pthread_cond_t nonZero;
};
mutable sema_t _semaphore;
#elif HAVE_PTHREAD && HAVE_POSIX_SEMAPHORES
mutable sem_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
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