1/* Copyright 2019 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15#ifndef TENSORFLOW_CORE_COMMON_RUNTIME_SHARED_COUNTER_H_
16#define TENSORFLOW_CORE_COMMON_RUNTIME_SHARED_COUNTER_H_
17
18#include <atomic>
19
20#include "tensorflow/core/platform/types.h"
21
22namespace tensorflow {
23// A lightweight thread-safe monotone counter for establishing
24// temporal ordering.
25class SharedCounter {
26 public:
27 int64_t get() { return value_; }
28 int64_t next() { return ++value_; }
29
30 private:
31 std::atomic<int64_t> value_{0};
32};
33
34} // namespace tensorflow
35#endif // TENSORFLOW_CORE_COMMON_RUNTIME_SHARED_COUNTER_H_
36