Line data    Source code

       1             : // Protocol Buffers - Google's data interchange format
       2             : // Copyright 2014 Google Inc.  All rights reserved.
       3             : // https://developers.google.com/protocol-buffers/
       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
      12             : // copyright notice, this list of conditions and the following disclaimer
      13             : // in the documentation and/or other materials provided with the
      14             : // distribution.
      15             : //     * Neither the name of Google Inc. nor the names of its
      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,
      24             : // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      25             : // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      26             : // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      27             : // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      28             : // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      29             : // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      30             : #ifndef GOOGLE_PROTOBUF_ATOMIC_SEQUENCE_NUM_H_
      31             : #define GOOGLE_PROTOBUF_ATOMIC_SEQUENCE_NUM_H_
      32             : 
      33             : #include <google/protobuf/stubs/atomicops.h>
      34             : 
      35             : namespace google {
      36             : namespace protobuf {
      37             : namespace internal {
      38             : 
      39             : class SequenceNumber {
      40             :  public:
      41          46 :   SequenceNumber() : word_(0) {}
      42             : 
      43             :   AtomicWord GetNext() {
      44           0 :     return NoBarrier_AtomicIncrement(&word_, 1) - 1;
      45             :   }
      46             :  private:
      47             :   AtomicWord word_;
      48             : };
      49             : 
      50             : }  // namespace internal
      51             : }  // namespace protobuf
      52             : }  // namespace google
      53             : 
      54             : #endif  // GOOGLE_PROTOBUF_ATOMIC_SEQUENCE_NUM_H_