1 // Copyright 2020 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 //     https://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, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14 #pragma once
15 
16 #include <condition_variable>
17 #include <limits>
18 #include <mutex>
19 
20 namespace pw::sync::backend {
21 
22 struct NativeCountingSemaphore {
23   std::mutex mutex;
24   std::condition_variable_any condition;
25   ptrdiff_t count;
26 };
27 using NativeCountingSemaphoreHandle = NativeCountingSemaphore&;
28 
29 inline constexpr ptrdiff_t kCountingSemaphoreMaxValue =
30     std::numeric_limits<ptrdiff_t>::max();
31 
32 }  // namespace pw::sync::backend
33