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
24 namespace base {
25 namespace subtle {
26
NoBarrier_CompareAndSwap(volatile AtomicWord * ptr,AtomicWord old_value,AtomicWord new_value)27 inline 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
NoBarrier_AtomicExchange(volatile AtomicWord * ptr,AtomicWord 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);
38 }
39
NoBarrier_AtomicIncrement(volatile AtomicWord * ptr,AtomicWord increment)40 inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
41 AtomicWord increment) {
42 return NoBarrier_AtomicIncrement(
43 reinterpret_cast<volatile Atomic32*>(ptr), increment);
44 }
45
Barrier_AtomicIncrement(volatile AtomicWord * ptr,AtomicWord increment)46 inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
47 AtomicWord increment) {
48 return Barrier_AtomicIncrement(
49 reinterpret_cast<volatile Atomic32*>(ptr), increment);
50 }
51
Acquire_CompareAndSwap(volatile AtomicWord * ptr,AtomicWord old_value,AtomicWord new_value)52 inline 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
Release_CompareAndSwap(volatile AtomicWord * ptr,AtomicWord old_value,AtomicWord new_value)59 inline 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
NoBarrier_Store(volatile AtomicWord * ptr,AtomicWord value)66 inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
67 NoBarrier_Store(
68 reinterpret_cast<volatile Atomic32*>(ptr), value);
69 }
70
Acquire_Store(volatile AtomicWord * ptr,AtomicWord value)71 inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
72 return base::subtle::Acquire_Store(
73 reinterpret_cast<volatile Atomic32*>(ptr), value);
74 }
75
Release_Store(volatile AtomicWord * ptr,AtomicWord value)76 inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
77 return base::subtle::Release_Store(
78 reinterpret_cast<volatile Atomic32*>(ptr), value);
79 }
80
NoBarrier_Load(volatile const AtomicWord * ptr)81 inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
82 return NoBarrier_Load(
83 reinterpret_cast<volatile const Atomic32*>(ptr));
84 }
85
Acquire_Load(volatile const AtomicWord * ptr)86 inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
87 return base::subtle::Acquire_Load(
88 reinterpret_cast<volatile const Atomic32*>(ptr));
89 }
90
Release_Load(volatile const AtomicWord * ptr)91 inline 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