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.
5 // This file is an internal atomic implementation, use base/atomicops.h instead.
7 #ifndef BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
8 #define BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
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.
16 // This file defines function overloads to allow both AtomicWord and Atomic32
17 // data to be used with this interface.
19 // On LP64 platforms, AtomicWord and Atomic64 are both always long,
20 // so this problem doesn't occur.
22 #if !defined(ARCH_CPU_64_BITS)
27 inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr,
29 AtomicWord new_value) {
30 return NoBarrier_CompareAndSwap(
31 reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
34 inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr,
35 AtomicWord new_value) {
36 return NoBarrier_AtomicExchange(
37 reinterpret_cast<volatile Atomic32*>(ptr), new_value);
40 inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
41 AtomicWord increment) {
42 return NoBarrier_AtomicIncrement(
43 reinterpret_cast<volatile Atomic32*>(ptr), increment);
46 inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
47 AtomicWord increment) {
48 return Barrier_AtomicIncrement(
49 reinterpret_cast<volatile Atomic32*>(ptr), increment);
52 inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
54 AtomicWord new_value) {
55 return base::subtle::Acquire_CompareAndSwap(
56 reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
59 inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
61 AtomicWord new_value) {
62 return base::subtle::Release_CompareAndSwap(
63 reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
66 inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
68 reinterpret_cast<volatile Atomic32*>(ptr), value);
71 inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
72 return base::subtle::Acquire_Store(
73 reinterpret_cast<volatile Atomic32*>(ptr), value);
76 inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
77 return base::subtle::Release_Store(
78 reinterpret_cast<volatile Atomic32*>(ptr), value);
81 inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
82 return NoBarrier_Load(
83 reinterpret_cast<volatile const Atomic32*>(ptr));
86 inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
87 return base::subtle::Acquire_Load(
88 reinterpret_cast<volatile const Atomic32*>(ptr));
91 inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
92 return base::subtle::Release_Load(
93 reinterpret_cast<volatile const Atomic32*>(ptr));
96 } // namespace base::subtle
99 #endif // !defined(ARCH_CPU_64_BITS)
101 #endif // BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_