third_party/WebKit/Source/platform/wtf/Atomics.h - chromium/src.git - Git at Google

 /*
  * Copyright (C) 2007, 2008, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  *     its contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #ifndef Atomics_h
 #define Atomics_h

 #include <stdint.h>
 #include "build/build_config.h"
 #include "platform/wtf/AddressSanitizer.h"
 #include "platform/wtf/Assertions.h"
 #include "platform/wtf/CPU.h"

 #if defined(COMPILER_MSVC)
 #include <windows.h>
 #endif

 #if defined(THREAD_SANITIZER)
 #include <sanitizer/tsan_interface_atomic.h>
 #endif

 #if defined(ADDRESS_SANITIZER)
 #include <sanitizer/asan_interface.h>
 #endif

 namespace WTF {

 #if defined(COMPILER_MSVC)

 // atomicAdd returns the result of the addition.
 ALWAYS_INLINE int AtomicAdd(int volatile* addend, int increment) {
   return InterlockedExchangeAdd(reinterpret_cast<long volatile*>(addend),
                                 static_cast<long>(increment)) +
          increment;
 }
 ALWAYS_INLINE unsigned AtomicAdd(unsigned volatile* addend,
                                  unsigned increment) {
   return InterlockedExchangeAdd(reinterpret_cast<long volatile*>(addend),
                                 static_cast<long>(increment)) +
          increment;
 }
 #if defined(_WIN64)
 ALWAYS_INLINE unsigned long long AtomicAdd(unsigned long long volatile* addend,
                                            unsigned long long increment) {
   return InterlockedExchangeAdd64(reinterpret_cast<long long volatile*>(addend),
                                   static_cast<long long>(increment)) +
          increment;
 }
 #endif

 // atomicSubtract returns the result of the subtraction.
 ALWAYS_INLINE int AtomicSubtract(int volatile* addend, int decrement) {
   return InterlockedExchangeAdd(reinterpret_cast<long volatile*>(addend),
                                 static_cast<long>(-decrement)) -
          decrement;
 }
 ALWAYS_INLINE unsigned AtomicSubtract(unsigned volatile* addend,
                                       unsigned decrement) {
   return InterlockedExchangeAdd(reinterpret_cast<long volatile*>(addend),
                                 -static_cast<long>(decrement)) -
          decrement;
 }
 #if defined(_WIN64)
 ALWAYS_INLINE unsigned long long AtomicSubtract(
     unsigned long long volatile* addend,
     unsigned long long decrement) {
   return InterlockedExchangeAdd64(reinterpret_cast<long long volatile*>(addend),
                                   -static_cast<long long>(decrement)) -
          decrement;
 }
 #endif

 ALWAYS_INLINE int AtomicIncrement(int volatile* addend) {
   return InterlockedIncrement(reinterpret_cast<long volatile*>(addend));
 }
 ALWAYS_INLINE int AtomicDecrement(int volatile* addend) {
   return InterlockedDecrement(reinterpret_cast<long volatile*>(addend));
 }

 ALWAYS_INLINE int64_t AtomicIncrement(int64_t volatile* addend) {
   return InterlockedIncrement64(reinterpret_cast<long long volatile*>(addend));
 }
 ALWAYS_INLINE int64_t AtomicDecrement(int64_t volatile* addend) {
   return InterlockedDecrement64(reinterpret_cast<long long volatile*>(addend));
 }

 ALWAYS_INLINE int AtomicTestAndSetToOne(int volatile* ptr) {
   int ret = InterlockedExchange(reinterpret_cast<long volatile*>(ptr), 1);
   DCHECK(!ret || ret == 1);
   return ret;
 }

 ALWAYS_INLINE void AtomicSetOneToZero(int volatile* ptr) {
   DCHECK_EQ(*ptr, 1);
   InterlockedExchange(reinterpret_cast<long volatile*>(ptr), 0);
 }

 #else

 // atomicAdd returns the result of the addition.
 ALWAYS_INLINE int AtomicAdd(int volatile* addend, int increment) {
   return __sync_add_and_fetch(addend, increment);
 }
 ALWAYS_INLINE unsigned AtomicAdd(unsigned volatile* addend,
                                  unsigned increment) {
   return __sync_add_and_fetch(addend, increment);
 }
 ALWAYS_INLINE unsigned long AtomicAdd(unsigned long volatile* addend,
                                       unsigned long increment) {
   return __sync_add_and_fetch(addend, increment);
 }
 // atomicSubtract returns the result of the subtraction.
 ALWAYS_INLINE int AtomicSubtract(int volatile* addend, int decrement) {
   return __sync_sub_and_fetch(addend, decrement);
 }
 ALWAYS_INLINE unsigned AtomicSubtract(unsigned volatile* addend,
                                       unsigned decrement) {
   return __sync_sub_and_fetch(addend, decrement);
 }
 ALWAYS_INLINE unsigned long AtomicSubtract(unsigned long volatile* addend,
                                            unsigned long decrement) {
   return __sync_sub_and_fetch(addend, decrement);
 }

 ALWAYS_INLINE int AtomicIncrement(int volatile* addend) {
   return AtomicAdd(addend, 1);
 }
 ALWAYS_INLINE int AtomicDecrement(int volatile* addend) {
   return AtomicSubtract(addend, 1);
 }

 ALWAYS_INLINE int64_t AtomicIncrement(int64_t volatile* addend) {
   return __sync_add_and_fetch(addend, 1);
 }
 ALWAYS_INLINE int64_t AtomicDecrement(int64_t volatile* addend) {
   return __sync_sub_and_fetch(addend, 1);
 }

 ALWAYS_INLINE int AtomicTestAndSetToOne(int volatile* ptr) {
   int ret = __sync_lock_test_and_set(ptr, 1);
   DCHECK(!ret || ret == 1);
   return ret;
 }

 ALWAYS_INLINE void AtomicSetOneToZero(int volatile* ptr) {
   DCHECK_EQ(*ptr, 1);
   __sync_lock_release(ptr);
 }
 #endif

 #if defined(THREAD_SANITIZER)
 // The definitions below assume an LP64 data model. This is fine because
 // TSan is only supported on x86_64 Linux.
 #if defined(ARCH_CPU_64_BITS) && defined(OS_LINUX)
 ALWAYS_INLINE void ReleaseStore(volatile int* ptr, int value) {
   __tsan_atomic32_store(ptr, value, __tsan_memory_order_release);
 }
 ALWAYS_INLINE void ReleaseStore(volatile unsigned* ptr, unsigned value) {
   __tsan_atomic32_store(reinterpret_cast<volatile int*>(ptr),
                         static_cast<int>(value), __tsan_memory_order_release);
 }
 ALWAYS_INLINE void ReleaseStore(volatile long* ptr, long value) {
   __tsan_atomic64_store(reinterpret_cast<volatile __tsan_atomic64*>(ptr),
                         static_cast<__tsan_atomic64>(value),
                         __tsan_memory_order_release);
 }
 ALWAYS_INLINE void ReleaseStore(volatile unsigned long* ptr,
                                 unsigned long value) {
   __tsan_atomic64_store(reinterpret_cast<volatile __tsan_atomic64*>(ptr),
                         static_cast<__tsan_atomic64>(value),
                         __tsan_memory_order_release);
 }
 ALWAYS_INLINE void ReleaseStore(volatile unsigned long long* ptr,
                                 unsigned long long value) {
   __tsan_atomic64_store(reinterpret_cast<volatile __tsan_atomic64*>(ptr),
                         static_cast<__tsan_atomic64>(value),
                         __tsan_memory_order_release);
 }
 ALWAYS_INLINE void ReleaseStore(void* volatile* ptr, void* value) {
   __tsan_atomic64_store(reinterpret_cast<volatile __tsan_atomic64*>(ptr),
                         reinterpret_cast<__tsan_atomic64>(value),
                         __tsan_memory_order_release);
 }
 ALWAYS_INLINE int AcquireLoad(volatile const int* ptr) {
   return __tsan_atomic32_load(ptr, __tsan_memory_order_acquire);
 }
 ALWAYS_INLINE unsigned AcquireLoad(volatile const unsigned* ptr) {
   return static_cast<unsigned>(__tsan_atomic32_load(
       reinterpret_cast<volatile const int*>(ptr), __tsan_memory_order_acquire));
 }
 ALWAYS_INLINE long AcquireLoad(volatile const long* ptr) {
   return static_cast<long>(__tsan_atomic64_load(
       reinterpret_cast<volatile const __tsan_atomic64*>(ptr),
       __tsan_memory_order_acquire));
 }
 ALWAYS_INLINE unsigned long AcquireLoad(volatile const unsigned long* ptr) {
   return static_cast<unsigned long>(__tsan_atomic64_load(
       reinterpret_cast<volatile const __tsan_atomic64*>(ptr),
       __tsan_memory_order_acquire));
 }
 ALWAYS_INLINE void* AcquireLoad(void* volatile const* ptr) {
   return reinterpret_cast<void*>(__tsan_atomic64_load(
       reinterpret_cast<volatile const __tsan_atomic64*>(ptr),
       __tsan_memory_order_acquire));
 }

 // Do not use NoBarrierStore/NoBarrierLoad for synchronization.
 ALWAYS_INLINE void NoBarrierStore(volatile float* ptr, float value) {
   static_assert(sizeof(int) == sizeof(float),
                 "int and float are different sizes");
   union {
     int ivalue;
     float fvalue;
   } u;
   u.fvalue = value;
   __tsan_atomic32_store(reinterpret_cast<volatile __tsan_atomic32*>(ptr),
                         u.ivalue, __tsan_memory_order_relaxed);
 }

 ALWAYS_INLINE float NoBarrierLoad(volatile const float* ptr) {
   static_assert(sizeof(int) == sizeof(float),
                 "int and float are different sizes");
   union {
     int ivalue;
     float fvalue;
   } u;
   u.ivalue = __tsan_atomic32_load(reinterpret_cast<volatile const int*>(ptr),
                                   __tsan_memory_order_relaxed);
   return u.fvalue;
 }
 #endif

 #else  // defined(THREAD_SANITIZER)

 #if defined(ARCH_CPU_X86_FAMILY)
 // Only compiler barrier is needed.
 #if defined(COMPILER_MSVC)
 // Starting from Visual Studio 2005 compiler guarantees acquire and release
 // semantics for operations on volatile variables. See MSDN entry for
 // MemoryBarrier macro.
 #define MEMORY_BARRIER()
 #else
 #define MEMORY_BARRIER() __asm__ __volatile__("" : : : "memory")
 #endif
 #else
 // Fallback to the compiler intrinsic on all other platforms.
 #define MEMORY_BARRIER() __sync_synchronize()
 #endif

 ALWAYS_INLINE void ReleaseStore(volatile int* ptr, int value) {
   MEMORY_BARRIER();
   *ptr = value;
 }
 ALWAYS_INLINE void ReleaseStore(volatile unsigned* ptr, unsigned value) {
   MEMORY_BARRIER();
   *ptr = value;
 }
 ALWAYS_INLINE void ReleaseStore(volatile long* ptr, long value) {
   MEMORY_BARRIER();
   *ptr = value;
 }
 ALWAYS_INLINE void ReleaseStore(volatile unsigned long* ptr,
                                 unsigned long value) {
   MEMORY_BARRIER();
   *ptr = value;
 }
 #if defined(ARCH_CPU_64_BITS)
 ALWAYS_INLINE void ReleaseStore(volatile unsigned long long* ptr,
                                 unsigned long long value) {
   MEMORY_BARRIER();
   *ptr = value;
 }
 #endif
 ALWAYS_INLINE void ReleaseStore(void* volatile* ptr, void* value) {
   MEMORY_BARRIER();
   *ptr = value;
 }

 ALWAYS_INLINE int AcquireLoad(volatile const int* ptr) {
   int value = *ptr;
   MEMORY_BARRIER();
   return value;
 }
 ALWAYS_INLINE unsigned AcquireLoad(volatile const unsigned* ptr) {
   unsigned value = *ptr;
   MEMORY_BARRIER();
   return value;
 }
 ALWAYS_INLINE long AcquireLoad(volatile const long* ptr) {
   long value = *ptr;
   MEMORY_BARRIER();
   return value;
 }
 ALWAYS_INLINE unsigned long AcquireLoad(volatile const unsigned long* ptr) {
   unsigned long value = *ptr;
   MEMORY_BARRIER();
   return value;
 }
 #if defined(ARCH_CPU_64_BITS)
 ALWAYS_INLINE unsigned long long AcquireLoad(
     volatile const unsigned long long* ptr) {
   unsigned long long value = *ptr;
   MEMORY_BARRIER();
   return value;
 }
 #endif
 ALWAYS_INLINE void* AcquireLoad(void* volatile const* ptr) {
   void* value = *ptr;
   MEMORY_BARRIER();
   return value;
 }

 // Do not use noBarrierStore/noBarrierLoad for synchronization.
 ALWAYS_INLINE void NoBarrierStore(volatile float* ptr, float value) {
   *ptr = value;
 }

 ALWAYS_INLINE float NoBarrierLoad(volatile const float* ptr) {
   float value = *ptr;
   return value;
 }

 #if defined(ADDRESS_SANITIZER)

 NO_SANITIZE_ADDRESS ALWAYS_INLINE void AsanUnsafeReleaseStore(
     volatile unsigned* ptr,
     unsigned value) {
   MEMORY_BARRIER();
   *ptr = value;
 }

 NO_SANITIZE_ADDRESS ALWAYS_INLINE unsigned AsanUnsafeAcquireLoad(
     volatile const unsigned* ptr) {
   unsigned value = *ptr;
   MEMORY_BARRIER();
   return value;
 }

 #endif  // defined(ADDRESS_SANITIZER)

 #undef MEMORY_BARRIER

 #endif

 #if !defined(ADDRESS_SANITIZER)

 ALWAYS_INLINE void AsanUnsafeReleaseStore(volatile unsigned* ptr,
                                           unsigned value) {
   ReleaseStore(ptr, value);
 }

 ALWAYS_INLINE unsigned AsanUnsafeAcquireLoad(volatile const unsigned* ptr) {
   return AcquireLoad(ptr);
 }

 #endif

 }  // namespace WTF

 using WTF::AtomicAdd;
 using WTF::AtomicSubtract;
 using WTF::AtomicDecrement;
 using WTF::AtomicIncrement;
 using WTF::AtomicTestAndSetToOne;
 using WTF::AtomicSetOneToZero;
 using WTF::AcquireLoad;
 using WTF::ReleaseStore;
 using WTF::NoBarrierLoad;
 using WTF::NoBarrierStore;

 // These methods allow loading from and storing to poisoned memory. Only
 // use these methods if you know what you are doing since they will
 // silence use-after-poison errors from ASan.
 using WTF::AsanUnsafeAcquireLoad;
 using WTF::AsanUnsafeReleaseStore;

 #endif  // Atomics_h
	/*
	* Copyright (C) 2007, 2008, 2010, 2012 Apple Inc. All rights reserved.
	* Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
	* its contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#ifndef Atomics_h
	#define Atomics_h

	#include <stdint.h>
	#include "build/build_config.h"
	#include "platform/wtf/AddressSanitizer.h"
	#include "platform/wtf/Assertions.h"
	#include "platform/wtf/CPU.h"

	#if defined(COMPILER_MSVC)
	#include <windows.h>
	#endif

	#if defined(THREAD_SANITIZER)
	#include <sanitizer/tsan_interface_atomic.h>
	#endif

	#if defined(ADDRESS_SANITIZER)
	#include <sanitizer/asan_interface.h>
	#endif

	namespace WTF {

	#if defined(COMPILER_MSVC)

	// atomicAdd returns the result of the addition.
	ALWAYS_INLINE int AtomicAdd(int volatile* addend, int increment) {
	return InterlockedExchangeAdd(reinterpret_cast<long volatile*>(addend),
	static_cast<long>(increment)) +
	increment;
	}
	ALWAYS_INLINE unsigned AtomicAdd(unsigned volatile* addend,
	unsigned increment) {
	return InterlockedExchangeAdd(reinterpret_cast<long volatile*>(addend),
	static_cast<long>(increment)) +
	increment;
	}
	#if defined(_WIN64)
	ALWAYS_INLINE unsigned long long AtomicAdd(unsigned long long volatile* addend,
	unsigned long long increment) {
	return InterlockedExchangeAdd64(reinterpret_cast<long long volatile*>(addend),
	static_cast<long long>(increment)) +
	increment;
	}
	#endif

	// atomicSubtract returns the result of the subtraction.
	ALWAYS_INLINE int AtomicSubtract(int volatile* addend, int decrement) {
	return InterlockedExchangeAdd(reinterpret_cast<long volatile*>(addend),
	static_cast<long>(-decrement)) -
	decrement;
	}
	ALWAYS_INLINE unsigned AtomicSubtract(unsigned volatile* addend,
	unsigned decrement) {
	return InterlockedExchangeAdd(reinterpret_cast<long volatile*>(addend),
	-static_cast<long>(decrement)) -
	decrement;
	}
	#if defined(_WIN64)
	ALWAYS_INLINE unsigned long long AtomicSubtract(
	unsigned long long volatile* addend,
	unsigned long long decrement) {
	return InterlockedExchangeAdd64(reinterpret_cast<long long volatile*>(addend),
	-static_cast<long long>(decrement)) -
	decrement;
	}
	#endif

	ALWAYS_INLINE int AtomicIncrement(int volatile* addend) {
	return InterlockedIncrement(reinterpret_cast<long volatile*>(addend));
	}
	ALWAYS_INLINE int AtomicDecrement(int volatile* addend) {
	return InterlockedDecrement(reinterpret_cast<long volatile*>(addend));
	}

	ALWAYS_INLINE int64_t AtomicIncrement(int64_t volatile* addend) {
	return InterlockedIncrement64(reinterpret_cast<long long volatile*>(addend));
	}
	ALWAYS_INLINE int64_t AtomicDecrement(int64_t volatile* addend) {
	return InterlockedDecrement64(reinterpret_cast<long long volatile*>(addend));
	}

	ALWAYS_INLINE int AtomicTestAndSetToOne(int volatile* ptr) {
	int ret = InterlockedExchange(reinterpret_cast<long volatile*>(ptr), 1);
	DCHECK(!ret \|\| ret == 1);
	return ret;
	}

	ALWAYS_INLINE void AtomicSetOneToZero(int volatile* ptr) {
	DCHECK_EQ(*ptr, 1);
	InterlockedExchange(reinterpret_cast<long volatile*>(ptr), 0);
	}

	#else

	// atomicAdd returns the result of the addition.
	ALWAYS_INLINE int AtomicAdd(int volatile* addend, int increment) {
	return __sync_add_and_fetch(addend, increment);
	}
	ALWAYS_INLINE unsigned AtomicAdd(unsigned volatile* addend,
	unsigned increment) {
	return __sync_add_and_fetch(addend, increment);
	}
	ALWAYS_INLINE unsigned long AtomicAdd(unsigned long volatile* addend,
	unsigned long increment) {
	return __sync_add_and_fetch(addend, increment);
	}
	// atomicSubtract returns the result of the subtraction.
	ALWAYS_INLINE int AtomicSubtract(int volatile* addend, int decrement) {
	return __sync_sub_and_fetch(addend, decrement);
	}
	ALWAYS_INLINE unsigned AtomicSubtract(unsigned volatile* addend,
	unsigned decrement) {
	return __sync_sub_and_fetch(addend, decrement);
	}
	ALWAYS_INLINE unsigned long AtomicSubtract(unsigned long volatile* addend,
	unsigned long decrement) {
	return __sync_sub_and_fetch(addend, decrement);
	}

	ALWAYS_INLINE int AtomicIncrement(int volatile* addend) {
	return AtomicAdd(addend, 1);
	}
	ALWAYS_INLINE int AtomicDecrement(int volatile* addend) {
	return AtomicSubtract(addend, 1);
	}

	ALWAYS_INLINE int64_t AtomicIncrement(int64_t volatile* addend) {
	return __sync_add_and_fetch(addend, 1);
	}
	ALWAYS_INLINE int64_t AtomicDecrement(int64_t volatile* addend) {
	return __sync_sub_and_fetch(addend, 1);
	}

	ALWAYS_INLINE int AtomicTestAndSetToOne(int volatile* ptr) {
	int ret = __sync_lock_test_and_set(ptr, 1);
	DCHECK(!ret \|\| ret == 1);
	return ret;
	}

	ALWAYS_INLINE void AtomicSetOneToZero(int volatile* ptr) {
	DCHECK_EQ(*ptr, 1);
	__sync_lock_release(ptr);
	}
	#endif

	#if defined(THREAD_SANITIZER)
	// The definitions below assume an LP64 data model. This is fine because
	// TSan is only supported on x86_64 Linux.
	#if defined(ARCH_CPU_64_BITS) && defined(OS_LINUX)
	ALWAYS_INLINE void ReleaseStore(volatile int* ptr, int value) {
	__tsan_atomic32_store(ptr, value, __tsan_memory_order_release);
	}
	ALWAYS_INLINE void ReleaseStore(volatile unsigned* ptr, unsigned value) {
	__tsan_atomic32_store(reinterpret_cast<volatile int*>(ptr),
	static_cast<int>(value), __tsan_memory_order_release);
	}
	ALWAYS_INLINE void ReleaseStore(volatile long* ptr, long value) {
	__tsan_atomic64_store(reinterpret_cast<volatile __tsan_atomic64*>(ptr),
	static_cast<__tsan_atomic64>(value),
	__tsan_memory_order_release);
	}
	ALWAYS_INLINE void ReleaseStore(volatile unsigned long* ptr,
	unsigned long value) {
	__tsan_atomic64_store(reinterpret_cast<volatile __tsan_atomic64*>(ptr),
	static_cast<__tsan_atomic64>(value),
	__tsan_memory_order_release);
	}
	ALWAYS_INLINE void ReleaseStore(volatile unsigned long long* ptr,
	unsigned long long value) {
	__tsan_atomic64_store(reinterpret_cast<volatile __tsan_atomic64*>(ptr),
	static_cast<__tsan_atomic64>(value),
	__tsan_memory_order_release);
	}
	ALWAYS_INLINE void ReleaseStore(void* volatile* ptr, void* value) {
	__tsan_atomic64_store(reinterpret_cast<volatile __tsan_atomic64*>(ptr),
	reinterpret_cast<__tsan_atomic64>(value),
	__tsan_memory_order_release);
	}
	ALWAYS_INLINE int AcquireLoad(volatile const int* ptr) {
	return __tsan_atomic32_load(ptr, __tsan_memory_order_acquire);
	}
	ALWAYS_INLINE unsigned AcquireLoad(volatile const unsigned* ptr) {
	return static_cast<unsigned>(__tsan_atomic32_load(
	reinterpret_cast<volatile const int*>(ptr), __tsan_memory_order_acquire));
	}
	ALWAYS_INLINE long AcquireLoad(volatile const long* ptr) {
	return static_cast<long>(__tsan_atomic64_load(
	reinterpret_cast<volatile const __tsan_atomic64*>(ptr),
	__tsan_memory_order_acquire));
	}
	ALWAYS_INLINE unsigned long AcquireLoad(volatile const unsigned long* ptr) {
	return static_cast<unsigned long>(__tsan_atomic64_load(
	reinterpret_cast<volatile const __tsan_atomic64*>(ptr),
	__tsan_memory_order_acquire));
	}
	ALWAYS_INLINE void* AcquireLoad(void* volatile const* ptr) {
	return reinterpret_cast<void*>(__tsan_atomic64_load(
	reinterpret_cast<volatile const __tsan_atomic64*>(ptr),
	__tsan_memory_order_acquire));
	}

	// Do not use NoBarrierStore/NoBarrierLoad for synchronization.
	ALWAYS_INLINE void NoBarrierStore(volatile float* ptr, float value) {
	static_assert(sizeof(int) == sizeof(float),
	"int and float are different sizes");
	union {
	int ivalue;
	float fvalue;
	} u;
	u.fvalue = value;
	__tsan_atomic32_store(reinterpret_cast<volatile __tsan_atomic32*>(ptr),
	u.ivalue, __tsan_memory_order_relaxed);
	}

	ALWAYS_INLINE float NoBarrierLoad(volatile const float* ptr) {
	static_assert(sizeof(int) == sizeof(float),
	"int and float are different sizes");
	union {
	int ivalue;
	float fvalue;
	} u;
	u.ivalue = __tsan_atomic32_load(reinterpret_cast<volatile const int*>(ptr),
	__tsan_memory_order_relaxed);
	return u.fvalue;
	}
	#endif

	#else // defined(THREAD_SANITIZER)

	#if defined(ARCH_CPU_X86_FAMILY)
	// Only compiler barrier is needed.
	#if defined(COMPILER_MSVC)
	// Starting from Visual Studio 2005 compiler guarantees acquire and release
	// semantics for operations on volatile variables. See MSDN entry for
	// MemoryBarrier macro.
	#define MEMORY_BARRIER()
	#else
	#define MEMORY_BARRIER() __asm__ __volatile__("" : : : "memory")
	#endif
	#else
	// Fallback to the compiler intrinsic on all other platforms.
	#define MEMORY_BARRIER() __sync_synchronize()
	#endif

	ALWAYS_INLINE void ReleaseStore(volatile int* ptr, int value) {
	MEMORY_BARRIER();
	*ptr = value;
	}
	ALWAYS_INLINE void ReleaseStore(volatile unsigned* ptr, unsigned value) {
	MEMORY_BARRIER();
	*ptr = value;
	}
	ALWAYS_INLINE void ReleaseStore(volatile long* ptr, long value) {
	MEMORY_BARRIER();
	*ptr = value;
	}
	ALWAYS_INLINE void ReleaseStore(volatile unsigned long* ptr,
	unsigned long value) {
	MEMORY_BARRIER();
	*ptr = value;
	}
	#if defined(ARCH_CPU_64_BITS)
	ALWAYS_INLINE void ReleaseStore(volatile unsigned long long* ptr,
	unsigned long long value) {
	MEMORY_BARRIER();
	*ptr = value;
	}
	#endif
	ALWAYS_INLINE void ReleaseStore(void* volatile* ptr, void* value) {
	MEMORY_BARRIER();
	*ptr = value;
	}

	ALWAYS_INLINE int AcquireLoad(volatile const int* ptr) {
	int value = *ptr;
	MEMORY_BARRIER();
	return value;
	}
	ALWAYS_INLINE unsigned AcquireLoad(volatile const unsigned* ptr) {
	unsigned value = *ptr;
	MEMORY_BARRIER();
	return value;
	}
	ALWAYS_INLINE long AcquireLoad(volatile const long* ptr) {
	long value = *ptr;
	MEMORY_BARRIER();
	return value;
	}
	ALWAYS_INLINE unsigned long AcquireLoad(volatile const unsigned long* ptr) {
	unsigned long value = *ptr;
	MEMORY_BARRIER();
	return value;
	}
	#if defined(ARCH_CPU_64_BITS)
	ALWAYS_INLINE unsigned long long AcquireLoad(
	volatile const unsigned long long* ptr) {
	unsigned long long value = *ptr;
	MEMORY_BARRIER();
	return value;
	}
	#endif
	ALWAYS_INLINE void* AcquireLoad(void* volatile const* ptr) {
	void* value = *ptr;
	MEMORY_BARRIER();
	return value;
	}

	// Do not use noBarrierStore/noBarrierLoad for synchronization.
	ALWAYS_INLINE void NoBarrierStore(volatile float* ptr, float value) {
	*ptr = value;
	}

	ALWAYS_INLINE float NoBarrierLoad(volatile const float* ptr) {
	float value = *ptr;
	return value;
	}

	#if defined(ADDRESS_SANITIZER)

	NO_SANITIZE_ADDRESS ALWAYS_INLINE void AsanUnsafeReleaseStore(
	volatile unsigned* ptr,
	unsigned value) {
	MEMORY_BARRIER();
	*ptr = value;
	}

	NO_SANITIZE_ADDRESS ALWAYS_INLINE unsigned AsanUnsafeAcquireLoad(
	volatile const unsigned* ptr) {
	unsigned value = *ptr;
	MEMORY_BARRIER();
	return value;
	}

	#endif // defined(ADDRESS_SANITIZER)

	#undef MEMORY_BARRIER

	#endif

	#if !defined(ADDRESS_SANITIZER)

	ALWAYS_INLINE void AsanUnsafeReleaseStore(volatile unsigned* ptr,
	unsigned value) {
	ReleaseStore(ptr, value);
	}

	ALWAYS_INLINE unsigned AsanUnsafeAcquireLoad(volatile const unsigned* ptr) {
	return AcquireLoad(ptr);
	}

	#endif

	} // namespace WTF

	using WTF::AtomicAdd;
	using WTF::AtomicSubtract;
	using WTF::AtomicDecrement;
	using WTF::AtomicIncrement;
	using WTF::AtomicTestAndSetToOne;
	using WTF::AtomicSetOneToZero;
	using WTF::AcquireLoad;
	using WTF::ReleaseStore;
	using WTF::NoBarrierLoad;
	using WTF::NoBarrierStore;

	// These methods allow loading from and storing to poisoned memory. Only
	// use these methods if you know what you are doing since they will
	// silence use-after-poison errors from ASan.
	using WTF::AsanUnsafeAcquireLoad;
	using WTF::AsanUnsafeReleaseStore;

	#endif // Atomics_h