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/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "os/utils.h"
namespace bluetooth {
namespace os {
// A event_fd work in non-blocking and Semaphore mode
class ReactiveSemaphore {
public:
// Creates a new ReactiveSemaphore with an initial value of |value|.
explicit ReactiveSemaphore(unsigned int value);
ReactiveSemaphore(const ReactiveSemaphore&) = delete;
ReactiveSemaphore& operator=(const ReactiveSemaphore&) = delete;
~ReactiveSemaphore();
// Decrements the value of |fd_|, this will cause a crash if |fd_| unreadable.
void Decrease();
// Increase the value of |fd_|, this will cause a crash if |fd_| unwritable.
void Increase();
int GetFd();
private:
int fd_;
};
} // namespace os
} // namespace bluetooth
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