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/*
* Copyright (C) 2015-2016 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.
*/
#ifndef ANDROID_WORKER_H_
#define ANDROID_WORKER_H_
#include <stdint.h>
#include <stdlib.h>
#include <condition_variable>
#include <mutex>
#include <string>
#include <thread>
namespace android {
class Worker {
public:
void Lock() {
mutex_.lock();
}
void Unlock() {
mutex_.unlock();
}
void Signal() {
cond_.notify_all();
}
void Exit();
bool initialized() const {
return initialized_;
}
protected:
Worker(const char *name, int priority);
virtual ~Worker();
int InitWorker();
virtual void Routine() = 0;
/*
* Must be called with the lock acquired. max_nanoseconds may be negative to
* indicate infinite timeout, otherwise it indicates the maximum time span to
* wait for a signal before returning.
* Returns -EINTR if interrupted by exit request, or -ETIMEDOUT if timed out
*/
int WaitForSignalOrExitLocked(int64_t max_nanoseconds = -1);
bool should_exit() const {
return exit_;
}
std::mutex mutex_;
std::condition_variable cond_;
private:
void InternalRoutine();
std::string name_;
int priority_;
std::unique_ptr<std::thread> thread_;
bool exit_;
bool initialized_;
};
} // namespace android
#endif
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