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authorHyungKyu Song <hk76.song@samsung.com>2013-02-15 15:53:36 (GMT)
committerHyungKyu Song <hk76.song@samsung.com>2013-02-15 15:53:36 (GMT)
commit74e42fb0242c25c1fa46e45fcf04e3c88ab40620 (patch)
treeebbbe8a8120031a0a1340161064b1e1a2b2bc2ef /base/atomic_sequence_num.h
parent98fbfad8ece16f88391165f4ad849e87e246bbdb (diff)
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Diffstat (limited to 'base/atomic_sequence_num.h')
-rw-r--r--base/atomic_sequence_num.h31
1 files changed, 31 insertions, 0 deletions
diff --git a/base/atomic_sequence_num.h b/base/atomic_sequence_num.h
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+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_ATOMIC_SEQUENCE_NUM_H_
+#define BASE_ATOMIC_SEQUENCE_NUM_H_
+#pragma once
+
+#include "base/atomicops.h"
+#include "base/basictypes.h"
+
+namespace base {
+
+class AtomicSequenceNumber {
+ public:
+ AtomicSequenceNumber() : seq_(0) { }
+ explicit AtomicSequenceNumber(base::LinkerInitialized x) { /* seq_ is 0 */ }
+
+ int GetNext() {
+ return static_cast<int>(
+ base::subtle::NoBarrier_AtomicIncrement(&seq_, 1) - 1);
+ }
+
+ private:
+ base::subtle::Atomic32 seq_;
+ DISALLOW_COPY_AND_ASSIGN(AtomicSequenceNumber);
+};
+
+} // namespace base
+
+#endif // BASE_ATOMIC_SEQUENCE_NUM_H_