public TimerHandler(Notifier n, int milliseconds)
{
int i;
atTime = (System.DateTime.Now.Ticks - 621355968000000000) / 10000 + milliseconds;
notifier = (Notifier)n;
isCancelled = false;
/*
* Add the event to the queue in the correct position (ordered by
* event firing time).
*
* NOTE: it's very important that if two timer handlers have the
* same atTime, the newer timer handler always goes after the
* older handler in the list. See comments in
* Notifier.TimerEvent.processEvent() for details.
*/
lock ( notifier )
{
generation = notifier.timerGeneration;
for (i = 0; i < notifier.timerList.Count; i++)
{
TimerHandler q = (TimerHandler)notifier.timerList[i];
if (atTime < q.atTime)
{
break;
}
}
notifier.timerList.Insert(i, this);
if (System.Threading.Thread.CurrentThread != notifier.primaryThread)
{
System.Threading.Monitor.PulseAll(notifier);
}
}
}
public int doOneEvent(int flags)
// Miscellaneous flag values: may be any
// combination of TCL.DONT_WAIT,
// TCL.WINDOW_EVENTS, TCL.FILE_EVENTS,
// TCL.TIMER_EVENTS, TCL.IDLE_EVENTS,
// or others defined by event sources.
{
int result = 0;
// No event flags is equivalent to TCL_ALL_EVENTS.
if ((flags & TCL.ALL_EVENTS) == 0)
{
flags |= TCL.ALL_EVENTS;
}
// The core of this procedure is an infinite loop, even though
// we only service one event. The reason for this is that we
// may be processing events that don't do anything inside of Tcl.
while (true)
{
// If idle events are the only things to service, skip the
// main part of the loop and go directly to handle idle
// events (i.e. don't wait even if TCL_DONT_WAIT isn't set).
if ((flags & TCL.ALL_EVENTS) == TCL.IDLE_EVENTS)
{
return(serviceIdle());
}
long sysTime = (System.DateTime.Now.Ticks - 621355968000000000) / 10000;
// If some timers have been expired, queue them into the
// event queue. We can't process expired times right away,
// because there may already be other events on the queue.
if (!timerPending && (timerList.Count > 0))
{
TimerHandler h = (TimerHandler)timerList[0];
if (h.atTime <= sysTime)
{
TimerEvent Tevent = new TimerEvent();
Tevent.notifier = this;
queueEvent(Tevent, TCL.QUEUE_TAIL);
timerPending = true;
}
}
// Service a queued event, if there are any.
if (serviceEvent(flags) != 0)
{
result = 1;
break;
}
// There is no event on the queue. Check for idle events.
if ((flags & TCL.IDLE_EVENTS) != 0)
{
if (serviceIdle() != 0)
{
result = 1;
break;
}
}
if ((flags & TCL.DONT_WAIT) != 0)
{
break;
}
// We don't have any event to service. We'll wait if
// TCL.DONT_WAIT. When the following wait() call returns,
// one of the following things may happen:
//
// (1) waitTime milliseconds has elasped (if waitTime != 0);
//
// (2) The primary notifier has been notify()'ed by other threads:
// (a) an event is queued by queueEvent().
// (b) a timer handler was created by new TimerHandler();
// (c) an idle handler was created by new IdleHandler();
// (3) We receive an InterruptedException.
//
try
{
// Don't acquire the monitor until we are about to wait
// for notification from another thread. It is critical
// that this entire method not be synchronized since
// a call to processEvent via serviceEvent could take
// a very long time. We don't want the monitor held
// during that time since that would force calls to
// queueEvent in other threads to wait.
lock (this)
{
if (timerList.Count > 0)
{
TimerHandler h = (TimerHandler)timerList[0];
long waitTime = h.atTime - sysTime;
if (waitTime > 0)
{
System.Threading.Monitor.Wait(this, TimeSpan.FromMilliseconds(waitTime));
}
}
else
{
System.Threading.Monitor.Wait(this);
}
} // synchronized (this)
}
catch (System.Threading.ThreadInterruptedException e)
{
// We ignore any InterruptedException and loop continuously
// until we receive an event.
}
}
return(result);
}