1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ipc/chromium/src/base/atomic_sequence_num.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,30 @@
1.4 +// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#ifndef BASE_ATOMIC_SEQUENCE_NUM_H_
1.9 +#define BASE_ATOMIC_SEQUENCE_NUM_H_
1.10 +
1.11 +#include "base/atomicops.h"
1.12 +#include "base/basictypes.h"
1.13 +
1.14 +namespace base {
1.15 +
1.16 +class AtomicSequenceNumber {
1.17 + public:
1.18 + AtomicSequenceNumber() : seq_(0) { }
1.19 + explicit AtomicSequenceNumber(base::LinkerInitialized x) { /* seq_ is 0 */ }
1.20 +
1.21 + int GetNext() {
1.22 + return static_cast<int>(
1.23 + base::subtle::NoBarrier_AtomicIncrement(&seq_, 1) - 1);
1.24 + }
1.25 +
1.26 + private:
1.27 + base::subtle::Atomic32 seq_;
1.28 + DISALLOW_COPY_AND_ASSIGN(AtomicSequenceNumber);
1.29 +};
1.30 +
1.31 +} // namespace base
1.32 +
1.33 +#endif // BASE_ATOMIC_SEQUENCE_NUM_H_
