/**
* Reschedules this timer.
*
* @param next The time when this timer should be called again. Use -1 to let
* the timer figure out a suitable time based on the interval.
*/
void Timer::Reschedule(double next)
{
ASSERT(!OwnsLock());
boost::mutex::scoped_lock lock(l_Mutex);
if (next < 0) {
/* Don't schedule the next call if this is not a periodic timer. */
if (m_Interval <= 0)
return;
next = Utility::GetTime() + m_Interval;
}
m_Next = next;
if (m_Started) {
/* Remove and re-add the timer to update the index. */
l_Timers.erase(GetSelf());
l_Timers.insert(GetSelf());
/* Notify the worker that we've rescheduled a timer. */
l_CV.notify_all();
}
}
/**
* Reschedules this timer.
*
* @param completed Whether the timer has just completed its callback.
* @param next The time when this timer should be called again. Use -1 to let
* the timer figure out a suitable time based on the interval.
*/
void Timer::InternalReschedule(bool completed, double next)
{
ASSERT(!OwnsLock());
boost::mutex::scoped_lock lock(l_TimerMutex);
if (completed)
m_Running = false;
if (next < 0) {
/* Don't schedule the next call if this is not a periodic timer. */
if (m_Interval <= 0)
return;
next = Utility::GetTime() + m_Interval;
}
m_Next = next;
if (m_Started && !m_Running) {
/* Remove and re-add the timer to update the index. */
l_Timers.erase(this);
l_Timers.insert(this);
/* Notify the worker that we've rescheduled a timer. */
l_TimerCV.notify_all();
}
}
/**
* Unregisters the timer and stops processing events for it.
*/
void Timer::Stop(void)
{
ASSERT(!OwnsLock());
boost::mutex::scoped_lock lock(l_Mutex);
m_Started = false;
l_Timers.erase(GetSelf());
/* Notify the worker thread that we've disabled a timer. */
l_CV.notify_all();
}
/**
* Adjusts all timers by adding the specified amount of time to their
* next scheduled timestamp.
*
* @param adjustment The adjustment.
*/
void Timer::AdjustTimers(double adjustment)
{
boost::mutex::scoped_lock lock(l_TimerMutex);
double now = Utility::GetTime();
typedef boost::multi_index::nth_index<TimerSet, 1>::type TimerView;
TimerView& idx = boost::get<1>(l_Timers);
std::vector<Timer *> timers;
BOOST_FOREACH(Timer *timer, idx) {
if (std::fabs(now - (timer->m_Next + adjustment)) <
std::fabs(now - timer->m_Next)) {
timer->m_Next += adjustment;
timers.push_back(timer);
}
}
BOOST_FOREACH(Timer *timer, timers) {
l_Timers.erase(timer);
l_Timers.insert(timer);
}
/**
* Adjusts all timers by adding the specified amount of time to their
* next scheduled timestamp.
*
* @param adjustment The adjustment.
*/
void Timer::AdjustTimers(double adjustment)
{
boost::mutex::scoped_lock lock(l_Mutex);
double now = Utility::GetTime();
typedef boost::multi_index::nth_index<TimerSet, 1>::type TimerView;
TimerView& idx = boost::get<1>(l_Timers);
TimerView::iterator it;
for (it = idx.begin(); it != idx.end(); it++) {
Timer::Ptr timer = it->lock();
if (abs(now - (timer->m_Next + adjustment)) <
abs(now - timer->m_Next)) {
timer->m_Next += adjustment;
l_Timers.erase(timer);
l_Timers.insert(timer);
}
}
/* Notify the worker that we've rescheduled some timers. */
l_CV.notify_all();
}
/**
* Worker thread proc for Timer objects.
*/
void Timer::TimerThreadProc(void)
{
Utility::SetThreadName("Timer Thread");
for (;;) {
boost::mutex::scoped_lock lock(l_Mutex);
typedef boost::multi_index::nth_index<TimerSet, 1>::type NextTimerView;
NextTimerView& idx = boost::get<1>(l_Timers);
/* Wait until there is at least one timer. */
while (idx.empty() && !l_StopThread)
l_CV.wait(lock);
if (l_StopThread)
break;
NextTimerView::iterator it = idx.begin();
Timer::Ptr timer = it->lock();
if (!timer) {
/* Remove the timer from the list if it's not alive anymore. */
idx.erase(it);
continue;
}
double wait = timer->m_Next - Utility::GetTime();
if (wait > 0) {
/* Make sure the timer we just examined can be destroyed while we're waiting. */
timer.reset();
/* Wait for the next timer. */
l_CV.timed_wait(lock, boost::posix_time::milliseconds(wait * 1000));
continue;
}
/* Remove the timer from the list so it doesn't get called again
* until the current call is completed. */
l_Timers.erase(timer);
lock.unlock();
/* Asynchronously call the timer. */
Utility::QueueAsyncCallback(boost::bind(&Timer::Call, timer));
}
}
/**
* Unregisters the timer and stops processing events for it.
*/
void Timer::Stop(bool wait)
{
ASSERT(!OwnsLock());
if (l_StopTimerThread)
return;
boost::mutex::scoped_lock lock(l_TimerMutex);
m_Started = false;
l_Timers.erase(this);
/* Notify the worker thread that we've disabled a timer. */
l_TimerCV.notify_all();
while (wait && m_Running)
l_TimerCV.wait(lock);
}
