// This code contains NVIDIA Confidential Information and is disclosed to you
// under a form of NVIDIA software license agreement provided separately to you.
//
// Notice
// NVIDIA Corporation and its licensors retain all intellectual property and
// proprietary rights in and to this software and related documentation and
// any modifications thereto. Any use, reproduction, disclosure, or
// distribution of this software and related documentation without an express
// license agreement from NVIDIA Corporation is strictly prohibited.
//
// ALL NVIDIA DESIGN SPECIFICATIONS, CODE ARE PROVIDED "AS IS.". NVIDIA MAKES
// NO WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO
// THE MATERIALS, AND EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF NONINFRINGEMENT,
// MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE.
//
// Information and code furnished is believed to be accurate and reliable.
// However, NVIDIA Corporation assumes no responsibility for the consequences of use of such
// information or for any infringement of patents or other rights of third parties that may
// result from its use. No license is granted by implication or otherwise under any patent
// or patent rights of NVIDIA Corporation. Details are subject to change without notice.
// This code supersedes and replaces all information previously supplied.
// NVIDIA Corporation products are not authorized for use as critical
// components in life support devices or systems without express written approval of
// NVIDIA Corporation.
//
// Copyright (c) 2008-2017 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
#include "NvCloth/ps/Ps.h"
#include "NvCloth/ps/PsAtomic.h"

#if ! PX_EMSCRIPTEN
#define PAUSE() asm("nop")
#else
#define PAUSE()
#endif

/** \brief NVidia namespace */
namespace nv
{
/** \brief nvcloth namespace */
namespace cloth
{
namespace ps
{

void* atomicCompareExchangePointer(volatile void** dest, void* exch, void* comp)
{
	return __sync_val_compare_and_swap(const_cast<void**>(dest), comp, exch);
}

int32_t atomicCompareExchange(volatile int32_t* dest, int32_t exch, int32_t comp)
{
	return __sync_val_compare_and_swap(dest, comp, exch);
}

int32_t atomicIncrement(volatile int32_t* val)
{
	return __sync_add_and_fetch(val, 1);
}

int32_t atomicDecrement(volatile int32_t* val)
{
	return __sync_sub_and_fetch(val, 1);
}

int32_t atomicAdd(volatile int32_t* val, int32_t delta)
{
	return __sync_add_and_fetch(val, delta);
}

int32_t atomicMax(volatile int32_t* val, int32_t val2)
{
	int32_t oldVal, newVal;

	do
	{
		PAUSE();
		oldVal = *val;

		if(val2 > oldVal)
			newVal = val2;
		else
			newVal = oldVal;

	} while(atomicCompareExchange(val, newVal, oldVal) != oldVal);

	return *val;
}

int32_t atomicExchange(volatile int32_t* val, int32_t val2)
{
	int32_t newVal, oldVal;

	do
	{
		PAUSE();
		oldVal = *val;
		newVal = val2;
	} while(atomicCompareExchange(val, newVal, oldVal) != oldVal);

	return oldVal;
}
} // namespace ps
} // namespace cloth
} // namespace nv