1// Protocol Buffers - Google's data interchange format
2// Copyright 2012 Google Inc.  All rights reserved.
3// http://code.google.com/p/protobuf/
4//
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are
7// met:
8//
9//     * Redistributions of source code must retain the above copyright
10// notice, this list of conditions and the following disclaimer.
11//     * Redistributions in binary form must reproduce the above
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13// in the documentation and/or other materials provided with the
14// distribution.
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16// contributors may be used to endorse or promote products derived from
17// this software without specific prior written permission.
18//
19// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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25// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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29// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31// This file is an internal atomic implementation, use atomicops.h instead.
32
33#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
34#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
35
36// AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32,
37// which in turn means int. On some LP32 platforms, intptr_t is an int, but
38// on others, it's a long. When AtomicWord and Atomic32 are based on different
39// fundamental types, their pointers are incompatible.
40//
41// This file defines function overloads to allow both AtomicWord and Atomic32
42// data to be used with this interface.
43//
44// On LP64 platforms, AtomicWord and Atomic64 are both always long,
45// so this problem doesn't occur.
46
47#if !defined(GOOGLE_PROTOBUF_ARCH_64_BIT)
48
49namespace google {
50namespace protobuf {
51namespace internal {
52
53inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr,
54                                           AtomicWord old_value,
55                                           AtomicWord new_value) {
56  return NoBarrier_CompareAndSwap(
57      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
58}
59
60inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr,
61                                           AtomicWord new_value) {
62  return NoBarrier_AtomicExchange(
63      reinterpret_cast<volatile Atomic32*>(ptr), new_value);
64}
65
66inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
67                                            AtomicWord increment) {
68  return NoBarrier_AtomicIncrement(
69      reinterpret_cast<volatile Atomic32*>(ptr), increment);
70}
71
72inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
73                                          AtomicWord increment) {
74  return Barrier_AtomicIncrement(
75      reinterpret_cast<volatile Atomic32*>(ptr), increment);
76}
77
78inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
79                                         AtomicWord old_value,
80                                         AtomicWord new_value) {
81  return Acquire_CompareAndSwap(
82      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
83}
84
85inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
86                                         AtomicWord old_value,
87                                         AtomicWord new_value) {
88  return Release_CompareAndSwap(
89      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
90}
91
92inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
93  NoBarrier_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
94}
95
96inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
97  return Acquire_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
98}
99
100inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
101  return Release_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
102}
103
104inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
105  return NoBarrier_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
106}
107
108inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
109  return Acquire_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
110}
111
112inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
113  return Release_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
114}
115
116}   // namespace internal
117}   // namespace protobuf
118}   // namespace google
119
120#endif  // !defined(GOOGLE_PROTOBUF_ARCH_64_BIT)
121
122#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
123