EAThread/source/eathread_mutex.cpp

///////////////////////////////////////////////////////////////////////////////
// Copyright (c) Electronic Arts Inc. All rights reserved.
///////////////////////////////////////////////////////////////////////////////

#include <eathread/internal/config.h>

EA_DISABLE_VC_WARNING(4574)
#include <string.h>
#include <new>
EA_RESTORE_VC_WARNING()

#if !EA_THREADS_AVAILABLE
	#include <eathread/eathread_mutex.h>
#elif EA_USE_CPP11_CONCURRENCY
	#include "cpp11/eathread_mutex_cpp11.cpp"
	#if defined(CreateMutex)
		#undef CreateMutex
	#endif
#elif defined(EA_PLATFORM_SONY)
	#include "kettle/eathread_mutex_kettle.cpp"
#elif defined(EA_PLATFORM_UNIX) || EA_POSIX_THREADS_AVAILABLE
	#include "unix/eathread_mutex_unix.cpp"
#elif defined(EA_PLATFORM_MICROSOFT)
	#include "pc/eathread_mutex_pc.cpp"
#endif


namespace EA
{
	namespace Thread
	{
		extern Allocator* gpAllocator;
	}
}


EA::Thread::Mutex* EA::Thread::MutexFactory::CreateMutex()
{
	if(gpAllocator)
		return new(gpAllocator->Alloc(sizeof(EA::Thread::Mutex))) EA::Thread::Mutex;
	else
		return new EA::Thread::Mutex;
}

void EA::Thread::MutexFactory::DestroyMutex(EA::Thread::Mutex* pMutex)
{
	if(gpAllocator)
	{
		pMutex->~Mutex();
		gpAllocator->Free(pMutex);
	}
	else
		delete pMutex;
}

size_t EA::Thread::MutexFactory::GetMutexSize()
{
	return sizeof(EA::Thread::Mutex);
}

EA::Thread::Mutex* EA::Thread::MutexFactory::ConstructMutex(void* pMemory)
{
	return new(pMemory) EA::Thread::Mutex;
}

void EA::Thread::MutexFactory::DestructMutex(EA::Thread::Mutex* pMutex)
{
	pMutex->~Mutex();
}



///////////////////////////////////////////////////////////////////////////////
// non-threaded implementation
///////////////////////////////////////////////////////////////////////////////

#if defined(EA_THREAD_NONTHREADED_MUTEX) && EA_THREAD_NONTHREADED_MUTEX

	EAMutexData::EAMutexData()
		: mnLockCount(0)
	{
		// Empty
	}


	EA::Thread::MutexParameters::MutexParameters(bool /*bIntraProcess*/, const char* /*pName*/)
	  : mbIntraProcess(true)
	{
	}


	EA::Thread::Mutex::Mutex(const MutexParameters* pMutexParameters, bool bDefaultParameters)
	{
		if(!pMutexParameters && bDefaultParameters)
		{
			MutexParameters parameters;
			Init(&parameters);
		}
		else
			Init(pMutexParameters);
	}


	EA::Thread::Mutex::~Mutex()
	{
		EAT_ASSERT(mMutexData.mnLockCount == 0);
	}


	bool EA::Thread::Mutex::Init(const MutexParameters* /*pMutexParameters*/)
	{
		// Possibly copy pMutexParameters->mName to mMutexData.mName
		return true;
	}


	int EA::Thread::Mutex::Lock(const ThreadTime& /*timeoutAbsolute*/)
	{
		EAT_ASSERT(mMutexData.mnLockCount < 100000);

		return ++mMutexData.mnLockCount;
	}


	int EA::Thread::Mutex::Unlock()
	{
		EAT_ASSERT(mMutexData.mnLockCount > 0);

		return --mMutexData.mnLockCount;
	}


	int EA::Thread::Mutex::GetLockCount() const
	{
		return mMutexData.mnLockCount;
	}


	bool EA::Thread::Mutex::HasLock() const
	{
		return (mMutexData.mnLockCount > 0);
	}

#endif // EA_THREAD_NONTHREADED_MUTEX