1// Protocol Buffers - Google's data interchange format
2// Copyright 2012 Google Inc.  All rights reserved.
3// https://developers.google.com/protocol-buffers/
4//
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30
31// This file is an internal atomic implementation, use atomicops.h instead.
32
33#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PNACL_H_
34#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PNACL_H_
35
36namespace google {
37namespace protobuf {
38namespace internal {
39
40inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
41                                         Atomic32 old_value,
42                                         Atomic32 new_value) {
43  return __sync_val_compare_and_swap(ptr, old_value, new_value);
44}
45
46inline void MemoryBarrier() {
47  __sync_synchronize();
48}
49
50inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
51                                       Atomic32 old_value,
52                                       Atomic32 new_value) {
53  Atomic32 ret = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
54  MemoryBarrier();
55  return ret;
56}
57
58inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
59  MemoryBarrier();
60  *ptr = value;
61}
62
63inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
64  Atomic32 value = *ptr;
65  MemoryBarrier();
66  return value;
67}
68
69}  // namespace internal
70}  // namespace protobuf
71}  // namespace google
72
73#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PNACL_H_
74