text: // This code contains NVIDIA Confidential Information and is disclosed to you
  // under a form of NVIDIA software license agreement provided separately to you.
  //
  // Notice
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  // 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
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  //
  // 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,
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  // 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
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  // 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 "Ps.h"
  #include "PsAtomic.h"
  
  #if ! PX_EMSCRIPTEN
  #define PAUSE() asm("nop")
  #else
  #define PAUSE()
  #endif
  
  namespace physx
  {
  namespace shdfnd
  {
  
  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 shdfnd
  } // namespace physx
  