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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.
*/
#undef __STRICT_ANSI__
#define __STDINT_LIMITS
#define __STDC_LIMIT_MACROS
#include <stdint.h>
#define LOG_TAG "TimedEventQueue"
#include <utils/Log.h>
#include <sys/time.h>
#undef NDEBUG
#include <assert.h>
#include <media/stagefright/TimedEventQueue.h>
namespace android {
TimedEventQueue::TimedEventQueue()
: mRunning(false),
mStopped(false) {
}
TimedEventQueue::~TimedEventQueue() {
stop();
}
void TimedEventQueue::start() {
if (mRunning) {
return;
}
mStopped = false;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
pthread_create(&mThread, &attr, ThreadWrapper, this);
pthread_attr_destroy(&attr);
mRunning = true;
}
void TimedEventQueue::stop(bool flush) {
if (!mRunning) {
return;
}
if (flush) {
postEventToBack(new StopEvent);
} else {
postTimedEvent(new StopEvent, INT64_MIN);
}
void *dummy;
pthread_join(mThread, &dummy);
mQueue.clear();
mRunning = false;
}
void TimedEventQueue::postEvent(const sp<Event> &event) {
// Reserve an earlier timeslot an INT64_MIN to be able to post
// the StopEvent to the absolute head of the queue.
postTimedEvent(event, INT64_MIN + 1);
}
void TimedEventQueue::postEventToBack(const sp<Event> &event) {
postTimedEvent(event, INT64_MAX);
}
void TimedEventQueue::postEventWithDelay(
const sp<Event> &event, int64_t delay_us) {
assert(delay_us >= 0);
postTimedEvent(event, getRealTimeUs() + delay_us);
}
void TimedEventQueue::postTimedEvent(
const sp<Event> &event, int64_t realtime_us) {
Mutex::Autolock autoLock(mLock);
List<QueueItem>::iterator it = mQueue.begin();
while (it != mQueue.end() && realtime_us >= (*it).realtime_us) {
++it;
}
QueueItem item;
item.event = event;
item.realtime_us = realtime_us;
if (it == mQueue.begin()) {
mQueueHeadChangedCondition.signal();
}
mQueue.insert(it, item);
mQueueNotEmptyCondition.signal();
}
bool TimedEventQueue::cancelEvent(const sp<Event> &event) {
Mutex::Autolock autoLock(mLock);
List<QueueItem>::iterator it = mQueue.begin();
while (it != mQueue.end() && (*it).event != event) {
++it;
}
if (it == mQueue.end()) {
return false;
}
if (it == mQueue.begin()) {
mQueueHeadChangedCondition.signal();
}
mQueue.erase(it);
return true;
}
// static
int64_t TimedEventQueue::getRealTimeUs() {
struct timeval tv;
gettimeofday(&tv, NULL);
return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
}
// static
void *TimedEventQueue::ThreadWrapper(void *me) {
static_cast<TimedEventQueue *>(me)->threadEntry();
return NULL;
}
void TimedEventQueue::threadEntry() {
for (;;) {
int64_t now_us;
sp<Event> event;
{
Mutex::Autolock autoLock(mLock);
if (mStopped) {
break;
}
while (mQueue.empty()) {
mQueueNotEmptyCondition.wait(mLock);
}
List<QueueItem>::iterator it;
for (;;) {
it = mQueue.begin();
now_us = getRealTimeUs();
int64_t when_us = (*it).realtime_us;
int64_t delay_us;
if (when_us < 0 || when_us == INT64_MAX) {
delay_us = 0;
} else {
delay_us = when_us - now_us;
}
if (delay_us <= 0) {
break;
}
status_t err = mQueueHeadChangedCondition.waitRelative(
mLock, delay_us * 1000);
if (err == -ETIMEDOUT) {
now_us = getRealTimeUs();
break;
}
}
event = (*it).event;
mQueue.erase(it);
}
// Fire event with the lock NOT held.
event->fire(this, now_us);
}
}
} // namespace android
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