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/*
* Copyright (C) 2009 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 TIMED_EVENT_QUEUE_H_
#define TIMED_EVENT_QUEUE_H_
#include <pthread.h>
#include <utils/List.h>
#include <utils/RefBase.h>
#include <utils/threads.h>
namespace android {
struct TimedEventQueue {
struct Event : public RefBase {
Event() {}
virtual ~Event() {}
protected:
virtual void fire(TimedEventQueue *queue, int64_t now_us) = 0;
private:
friend class TimedEventQueue;
Event(const Event &);
Event &operator=(const Event &);
};
TimedEventQueue();
~TimedEventQueue();
// Start executing the event loop.
void start();
// Stop executing the event loop, if flush is false, any pending
// events are discarded, otherwise the queue will stop (and this call
// return) once all pending events have been handled.
void stop(bool flush = false);
// Posts an event to the front of the queue (after all events that
// have previously been posted to the front but before timed events).
void postEvent(const sp<Event> &event);
void postEventToBack(const sp<Event> &event);
// It is an error to post an event with a negative delay.
void postEventWithDelay(const sp<Event> &event, int64_t delay_us);
// If the event is to be posted at a time that has already passed,
// it will fire as soon as possible.
void postTimedEvent(const sp<Event> &event, int64_t realtime_us);
// Returns true iff event is currently in the queue and has been
// successfully cancelled. In this case the event will have been
// removed from the queue and won't fire.
bool cancelEvent(const sp<Event> &event);
static int64_t getRealTimeUs();
private:
struct QueueItem {
sp<Event> event;
int64_t realtime_us;
};
struct StopEvent : public TimedEventQueue::Event {
virtual void fire(TimedEventQueue *queue, int64_t now_us) {
queue->mStopped = true;
}
};
pthread_t mThread;
List<QueueItem> mQueue;
Mutex mLock;
Condition mQueueNotEmptyCondition;
Condition mQueueHeadChangedCondition;
bool mRunning;
bool mStopped;
static void *ThreadWrapper(void *me);
void threadEntry();
TimedEventQueue(const TimedEventQueue &);
TimedEventQueue &operator=(const TimedEventQueue &);
};
} // namespace android
#endif // TIMED_EVENT_QUEUE_H_
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