phajdan.jr@chromium.org | 22b86ac | 2011-04-15 15:15:04 +0900 | [diff] [blame] | 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_ |
phajdan.jr@chromium.org | 22b86ac | 2011-04-15 15:15:04 +0900 | [diff] [blame] | 9 | |
| 10 | // AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32, |
| 11 | // which in turn means int. On some LP32 platforms, intptr_t is an int, but |
| 12 | // on others, it's a long. When AtomicWord and Atomic32 are based on different |
| 13 | // fundamental types, their pointers are incompatible. |
| 14 | // |
| 15 | // This file defines function overloads to allow both AtomicWord and Atomic32 |
| 16 | // data to be used with this interface. |
| 17 | // |
| 18 | // On LP64 platforms, AtomicWord and Atomic64 are both always long, |
| 19 | // so this problem doesn't occur. |
| 20 | |
| 21 | #if !defined(ARCH_CPU_64_BITS) |
| 22 | |
| 23 | namespace base { |
| 24 | namespace subtle { |
| 25 | |
| 26 | inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr, |
| 27 | AtomicWord old_value, |
| 28 | AtomicWord new_value) { |
| 29 | return NoBarrier_CompareAndSwap( |
| 30 | reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value); |
| 31 | } |
| 32 | |
| 33 | inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr, |
| 34 | AtomicWord new_value) { |
| 35 | return NoBarrier_AtomicExchange( |
| 36 | reinterpret_cast<volatile Atomic32*>(ptr), new_value); |
| 37 | } |
| 38 | |
| 39 | inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr, |
| 40 | AtomicWord increment) { |
| 41 | return NoBarrier_AtomicIncrement( |
| 42 | reinterpret_cast<volatile Atomic32*>(ptr), increment); |
| 43 | } |
| 44 | |
| 45 | inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr, |
| 46 | AtomicWord increment) { |
| 47 | return Barrier_AtomicIncrement( |
| 48 | reinterpret_cast<volatile Atomic32*>(ptr), increment); |
| 49 | } |
| 50 | |
| 51 | inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr, |
| 52 | AtomicWord old_value, |
| 53 | AtomicWord new_value) { |
| 54 | return base::subtle::Acquire_CompareAndSwap( |
| 55 | reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value); |
| 56 | } |
| 57 | |
| 58 | inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr, |
| 59 | AtomicWord old_value, |
| 60 | AtomicWord new_value) { |
| 61 | return base::subtle::Release_CompareAndSwap( |
| 62 | reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value); |
| 63 | } |
| 64 | |
| 65 | inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) { |
| 66 | NoBarrier_Store( |
| 67 | reinterpret_cast<volatile Atomic32*>(ptr), value); |
| 68 | } |
| 69 | |
| 70 | inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) { |
| 71 | return base::subtle::Acquire_Store( |
| 72 | reinterpret_cast<volatile Atomic32*>(ptr), value); |
| 73 | } |
| 74 | |
| 75 | inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) { |
| 76 | return base::subtle::Release_Store( |
| 77 | reinterpret_cast<volatile Atomic32*>(ptr), value); |
| 78 | } |
| 79 | |
| 80 | inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) { |
| 81 | return NoBarrier_Load( |
| 82 | reinterpret_cast<volatile const Atomic32*>(ptr)); |
| 83 | } |
| 84 | |
| 85 | inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) { |
| 86 | return base::subtle::Acquire_Load( |
| 87 | reinterpret_cast<volatile const Atomic32*>(ptr)); |
| 88 | } |
| 89 | |
| 90 | inline AtomicWord Release_Load(volatile const AtomicWord* ptr) { |
| 91 | return base::subtle::Release_Load( |
| 92 | reinterpret_cast<volatile const Atomic32*>(ptr)); |
| 93 | } |
| 94 | |
| 95 | } // namespace base::subtle |
| 96 | } // namespace base |
| 97 | |
| 98 | #endif // !defined(ARCH_CPU_64_BITS) |
| 99 | |
| 100 | #endif // BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_ |