1// Copyright (c) 2011 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5// This file is an internal atomic implementation, use base/atomicops.h instead. 6 7#ifndef BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_ 8#define BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_ 9#pragma once 10 11// AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32, 12// which in turn means int. On some LP32 platforms, intptr_t is an int, but 13// on others, it's a long. When AtomicWord and Atomic32 are based on different 14// fundamental types, their pointers are incompatible. 15// 16// This file defines function overloads to allow both AtomicWord and Atomic32 17// data to be used with this interface. 18// 19// On LP64 platforms, AtomicWord and Atomic64 are both always long, 20// so this problem doesn't occur. 21 22#if !defined(ARCH_CPU_64_BITS) 23 24namespace base { 25namespace subtle { 26 27inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr, 28 AtomicWord old_value, 29 AtomicWord new_value) { 30 return NoBarrier_CompareAndSwap( 31 reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value); 32} 33 34inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr, 35 AtomicWord new_value) { 36 return NoBarrier_AtomicExchange( 37 reinterpret_cast<volatile Atomic32*>(ptr), new_value); 38} 39 40inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr, 41 AtomicWord increment) { 42 return NoBarrier_AtomicIncrement( 43 reinterpret_cast<volatile Atomic32*>(ptr), increment); 44} 45 46inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr, 47 AtomicWord increment) { 48 return Barrier_AtomicIncrement( 49 reinterpret_cast<volatile Atomic32*>(ptr), increment); 50} 51 52inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr, 53 AtomicWord old_value, 54 AtomicWord new_value) { 55 return base::subtle::Acquire_CompareAndSwap( 56 reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value); 57} 58 59inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr, 60 AtomicWord old_value, 61 AtomicWord new_value) { 62 return base::subtle::Release_CompareAndSwap( 63 reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value); 64} 65 66inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) { 67 NoBarrier_Store( 68 reinterpret_cast<volatile Atomic32*>(ptr), value); 69} 70 71inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) { 72 return base::subtle::Acquire_Store( 73 reinterpret_cast<volatile Atomic32*>(ptr), value); 74} 75 76inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) { 77 return base::subtle::Release_Store( 78 reinterpret_cast<volatile Atomic32*>(ptr), value); 79} 80 81inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) { 82 return NoBarrier_Load( 83 reinterpret_cast<volatile const Atomic32*>(ptr)); 84} 85 86inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) { 87 return base::subtle::Acquire_Load( 88 reinterpret_cast<volatile const Atomic32*>(ptr)); 89} 90 91inline AtomicWord Release_Load(volatile const AtomicWord* ptr) { 92 return base::subtle::Release_Load( 93 reinterpret_cast<volatile const Atomic32*>(ptr)); 94} 95 96} // namespace base::subtle 97} // namespace base 98 99#endif // !defined(ARCH_CPU_64_BITS) 100 101#endif // BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_ 102