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
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
NoBarrier_CompareAndSwap(volatile AtomicWord * ptr,AtomicWord old_value,AtomicWord new_value)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
NoBarrier_AtomicExchange(volatile AtomicWord * ptr,AtomicWord new_value)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
NoBarrier_AtomicIncrement(volatile AtomicWord * ptr,AtomicWord increment)39 inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
40 AtomicWord increment) {
41 return NoBarrier_AtomicIncrement(
42 reinterpret_cast<volatile Atomic32*>(ptr), increment);
43 }
44
Barrier_AtomicIncrement(volatile AtomicWord * ptr,AtomicWord increment)45 inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
46 AtomicWord increment) {
47 return Barrier_AtomicIncrement(
48 reinterpret_cast<volatile Atomic32*>(ptr), increment);
49 }
50
Acquire_CompareAndSwap(volatile AtomicWord * ptr,AtomicWord old_value,AtomicWord new_value)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
Release_CompareAndSwap(volatile AtomicWord * ptr,AtomicWord old_value,AtomicWord new_value)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
NoBarrier_Store(volatile AtomicWord * ptr,AtomicWord value)65 inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
66 NoBarrier_Store(
67 reinterpret_cast<volatile Atomic32*>(ptr), value);
68 }
69
Acquire_Store(volatile AtomicWord * ptr,AtomicWord value)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
Release_Store(volatile AtomicWord * ptr,AtomicWord value)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
NoBarrier_Load(volatile const AtomicWord * ptr)80 inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
81 return NoBarrier_Load(
82 reinterpret_cast<volatile const Atomic32*>(ptr));
83 }
84
Acquire_Load(volatile const AtomicWord * ptr)85 inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
86 return base::subtle::Acquire_Load(
87 reinterpret_cast<volatile const Atomic32*>(ptr));
88 }
89
Release_Load(volatile const AtomicWord * ptr)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_
101