license.bot | f003cfe | 2008-08-24 09:55:55 +0900 | [diff] [blame] | 1 | // Copyright (c) 2006-2008 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. |
deanm@google.com | 1579ec7 | 2008-08-05 18:57:36 +0900 | [diff] [blame] | 4 | |
| 5 | #ifndef BASE_ATOMIC_SEQUENCE_NUM_H_ |
| 6 | #define BASE_ATOMIC_SEQUENCE_NUM_H_ |
| 7 | |
| 8 | #include "base/atomicops.h" |
| 9 | #include "base/basictypes.h" |
| 10 | |
| 11 | namespace base { |
| 12 | |
| 13 | class AtomicSequenceNumber { |
| 14 | public: |
| 15 | AtomicSequenceNumber() : seq_(0) { } |
deanm@google.com | 35e0260 | 2008-09-02 22:11:46 +0900 | [diff] [blame] | 16 | explicit AtomicSequenceNumber(base::LinkerInitialized x) { /* seq_ is 0 */ } |
deanm@google.com | 1579ec7 | 2008-08-05 18:57:36 +0900 | [diff] [blame] | 17 | |
| 18 | int GetNext() { |
| 19 | return static_cast<int>( |
| 20 | base::subtle::NoBarrier_AtomicIncrement(&seq_, 1) - 1); |
| 21 | } |
| 22 | |
| 23 | private: |
| 24 | base::subtle::Atomic32 seq_; |
| 25 | DISALLOW_COPY_AND_ASSIGN(AtomicSequenceNumber); |
| 26 | }; |
| 27 | |
| 28 | } // namespace base |
| 29 | |
| 30 | #endif // BASE_ATOMIC_SEQUENCE_NUM_H_ |