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1 /* Copyright 2019 The TensorFlow Authors. All Rights Reserved.
2 
3 Licensed under the Apache License, Version 2.0 (the "License");
4 you may not use this file except in compliance with the License.
5 You may obtain a copy of the License at
6 
7     http://www.apache.org/licenses/LICENSE-2.0
8 
9 Unless required by applicable law or agreed to in writing, software
10 distributed under the License is distributed on an "AS IS" BASIS,
11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 See the License for the specific language governing permissions and
13 limitations under the License.
14 ==============================================================================*/
15 #ifndef TENSORFLOW_CORE_COMMON_RUNTIME_SHARED_COUNTER_H_
16 #define TENSORFLOW_CORE_COMMON_RUNTIME_SHARED_COUNTER_H_
17 
18 namespace tensorflow {
19 // A lightweight thread-safe monotone counter for establishing
20 // temporal ordering.
21 class SharedCounter {
22  public:
get()23   int64 get() { return value_; }
next()24   int64 next() { return ++value_; }
25 
26  private:
27   std::atomic<int64> value_{0};
28 };
29 
30 }  // namespace tensorflow
31 #endif  // TENSORFLOW_CORE_COMMON_RUNTIME_SHARED_COUNTER_H_
32