public void deleteEvents(EventDeleter deleter)
// The deleter that checks whether an event
// should be removed.
{
lock (this)
{
TclEvent evt, prev;
TclEvent servicedEvent = null;
// Handle the special case of deletion of a single event that was just
// processed by the serviceEvent() method.
if (deleter == this)
{
servicedEvent = this.servicedEvent;
if (servicedEvent == null)
{
throw new TclRuntimeError("servicedEvent was not set by serviceEvent()");
}
this.servicedEvent = null;
}
for (prev = null, evt = firstEvent; evt != null; evt = evt.next)
{
if (((servicedEvent == null) && (deleter.deleteEvent(evt) == 1)) || (evt == servicedEvent))
{
if (evt == firstEvent)
{
firstEvent = evt.next;
}
else
{
prev.next = evt.next;
}
if (evt.next == null)
{
lastEvent = prev;
}
if (evt == markerEvent)
{
markerEvent = prev;
}
if (evt == servicedEvent)
{
servicedEvent = null;
break; // Just service this one event in the special case
}
}
else
{
prev = evt;
}
}
if (servicedEvent != null)
{
throw new TclRuntimeError("servicedEvent was not removed from the queue");
}
}
}
private Notifier(System.Threading.Thread primaryTh)
{
primaryThread = primaryTh;
firstEvent = null;
lastEvent = null;
markerEvent = null;
timerList = new ArrayList(10);
timerGeneration = 0;
idleList = new ArrayList(10);
idleGeneration = 0;
timerPending = false;
refCount = 0;
}
private TclEvent getAvailableEvent(TclEvent skipEvent)
// Indicates that the given event should not
// be returned. This argument can be null.
{
lock (this)
{
TclEvent evt;
for (evt = firstEvent; evt != null; evt = evt.next)
{
if ((evt.isProcessing == false) && (evt.isProcessed == false) && (evt != skipEvent))
{
return(evt);
}
}
return(null);
}
}
private Notifier(System.Threading.Thread primaryTh)
{
primaryThread = primaryTh;
firstEvent = null;
lastEvent = null;
markerEvent = null;
timerList = new ArrayList(10);
timerGeneration = 0;
idleList = new ArrayList(10);
idleGeneration = 0;
timerPending = false;
refCount = 0;
}
private TclEvent getAvailableEvent(TclEvent skipEvent)
// Indicates that the given event should not
// be returned. This argument can be null.
{
lock (this)
{
TclEvent evt;
for (evt = firstEvent; evt != null; evt = evt.next)
{
if ((evt.isProcessing == false) && (evt.isProcessed == false) && (evt != skipEvent))
{
return evt;
}
}
return null;
}
}
internal int serviceEvent(int flags)
// Indicates what events should be processed.
// May be any combination of TCL.WINDOW_EVENTS
// TCL.FILE_EVENTS, TCL.TIMER_EVENTS, or other
// flags defined elsewhere. Events not
// matching this will be skipped for processing
// later.
{
TclEvent evt;
// No event flags is equivalent to TCL_ALL_EVENTS.
if ((flags & TCL.ALL_EVENTS) == 0)
{
flags |= TCL.ALL_EVENTS;
}
// Loop through all the events in the queue until we find one
// that can actually be handled.
evt = null;
while ((evt = getAvailableEvent(evt)) != null)
{
// Call the handler for the event. If it actually handles the
// event then free the storage for the event. There are two
// tricky things here, both stemming from the fact that the event
// code may be re-entered while servicing the event:
//
// 1. Set the "isProcessing" field to true. This is a signal to
// ourselves that we shouldn't reexecute the handler if the
// event loop is re-entered.
// 2. When freeing the event, must search the queue again from the
// front to find it. This is because the event queue could
// change almost arbitrarily while handling the event, so we
// can't depend on pointers found now still being valid when
// the handler returns.
evt.isProcessing = true;
if (evt.processEvent(flags) != 0)
{
evt.isProcessed = true;
// Don't allocate/grab the monitor for the event unless sync()
// has been called in another thread. This is thread safe
// since sync() checks the isProcessed flag before calling wait.
if (evt.needsNotify)
{
lock (evt)
{
System.Threading.Monitor.PulseAll(evt);
}
}
// Remove this specific event from the queue
servicedEvent = evt;
deleteEvents(this);
return 1;
}
else
{
// The event wasn't actually handled, so we have to
// restore the isProcessing field to allow the event to be
// attempted again.
evt.isProcessing = false;
}
// The handler for this event asked to defer it. Just go on to
// the next event.
continue;
}
return 0;
}
public int deleteEvent(TclEvent evt)
{
throw new TclRuntimeError("The Notifier.deleteEvent() method should not be called");
}
public void deleteEvents(EventDeleter deleter)
// The deleter that checks whether an event
// should be removed.
{
lock (this)
{
TclEvent evt, prev;
TclEvent servicedEvent = null;
// Handle the special case of deletion of a single event that was just
// processed by the serviceEvent() method.
if (deleter == this)
{
servicedEvent = this.servicedEvent;
if (servicedEvent == null)
throw new TclRuntimeError("servicedEvent was not set by serviceEvent()");
this.servicedEvent = null;
}
for (prev = null, evt = firstEvent; evt != null; evt = evt.next)
{
if (((servicedEvent == null) && (deleter.deleteEvent(evt) == 1)) || (evt == servicedEvent))
{
if (evt == firstEvent)
{
firstEvent = evt.next;
}
else
{
prev.next = evt.next;
}
if (evt.next == null)
{
lastEvent = prev;
}
if (evt == markerEvent)
{
markerEvent = prev;
}
if (evt == servicedEvent)
{
servicedEvent = null;
break; // Just service this one event in the special case
}
}
else
{
prev = evt;
}
}
if (servicedEvent != null)
{
throw new TclRuntimeError("servicedEvent was not removed from the queue");
}
}
}
public void queueEvent(TclEvent evt, int position)
// One of TCL.QUEUE_TAIL,
// TCL.QUEUE_HEAD or TCL.QUEUE_MARK.
{
lock (this)
{
evt.notifier = this;
if (position == TCL.QUEUE_TAIL)
{
// Append the event on the end of the queue.
evt.next = null;
if (firstEvent == null)
{
firstEvent = evt;
}
else
{
lastEvent.next = evt;
}
lastEvent = evt;
}
else if (position == TCL.QUEUE_HEAD)
{
// Push the event on the head of the queue.
evt.next = firstEvent;
if (firstEvent == null)
{
lastEvent = evt;
}
firstEvent = evt;
}
else if (position == TCL.QUEUE_MARK)
{
// Insert the event after the current marker event and advance
// the marker to the new event.
if (markerEvent == null)
{
evt.next = firstEvent;
firstEvent = evt;
}
else
{
evt.next = markerEvent.next;
markerEvent.next = evt;
}
markerEvent = evt;
if (evt.next == null)
{
lastEvent = evt;
}
}
else
{
// Wrong flag.
throw new TclRuntimeError("wrong position \"" + position + "\", must be TCL.QUEUE_HEAD, TCL.QUEUE_TAIL or TCL.QUEUE_MARK");
}
if (System.Threading.Thread.CurrentThread != primaryThread)
{
System.Threading.Monitor.PulseAll(this);
}
}
}
internal int serviceEvent(int flags)
// Indicates what events should be processed.
// May be any combination of TCL.WINDOW_EVENTS
// TCL.FILE_EVENTS, TCL.TIMER_EVENTS, or other
// flags defined elsewhere. Events not
// matching this will be skipped for processing
// later.
{
TclEvent evt;
// No event flags is equivalent to TCL_ALL_EVENTS.
if ((flags & TCL.ALL_EVENTS) == 0)
{
flags |= TCL.ALL_EVENTS;
}
// Loop through all the events in the queue until we find one
// that can actually be handled.
evt = null;
while ((evt = getAvailableEvent(evt)) != null)
{
// Call the handler for the event. If it actually handles the
// event then free the storage for the event. There are two
// tricky things here, both stemming from the fact that the event
// code may be re-entered while servicing the event:
//
// 1. Set the "isProcessing" field to true. This is a signal to
// ourselves that we shouldn't reexecute the handler if the
// event loop is re-entered.
// 2. When freeing the event, must search the queue again from the
// front to find it. This is because the event queue could
// change almost arbitrarily while handling the event, so we
// can't depend on pointers found now still being valid when
// the handler returns.
evt.isProcessing = true;
if (evt.processEvent(flags) != 0)
{
evt.isProcessed = true;
// Don't allocate/grab the monitor for the event unless sync()
// has been called in another thread. This is thread safe
// since sync() checks the isProcessed flag before calling wait.
if (evt.needsNotify)
{
lock ( evt )
{
System.Threading.Monitor.PulseAll(evt);
}
}
// Remove this specific event from the queue
servicedEvent = evt;
deleteEvents(this);
return(1);
}
else
{
// The event wasn't actually handled, so we have to
// restore the isProcessing field to allow the event to be
// attempted again.
evt.isProcessing = false;
}
// The handler for this event asked to defer it. Just go on to
// the next event.
continue;
}
return(0);
}
public int deleteEvent(TclEvent evt)
{
throw new TclRuntimeError("The Notifier.deleteEvent() method should not be called");
}
public void queueEvent(TclEvent evt, int position)
// One of TCL.QUEUE_TAIL,
// TCL.QUEUE_HEAD or TCL.QUEUE_MARK.
{
lock (this)
{
evt.notifier = this;
if (position == TCL.QUEUE_TAIL)
{
// Append the event on the end of the queue.
evt.next = null;
if (firstEvent == null)
{
firstEvent = evt;
}
else
{
lastEvent.next = evt;
}
lastEvent = evt;
}
else if (position == TCL.QUEUE_HEAD)
{
// Push the event on the head of the queue.
evt.next = firstEvent;
if (firstEvent == null)
{
lastEvent = evt;
}
firstEvent = evt;
}
else if (position == TCL.QUEUE_MARK)
{
// Insert the event after the current marker event and advance
// the marker to the new event.
if (markerEvent == null)
{
evt.next = firstEvent;
firstEvent = evt;
}
else
{
evt.next = markerEvent.next;
markerEvent.next = evt;
}
markerEvent = evt;
if (evt.next == null)
{
lastEvent = evt;
}
}
else
{
// Wrong flag.
throw new TclRuntimeError("wrong position \"" + position + "\", must be TCL.QUEUE_HEAD, TCL.QUEUE_TAIL or TCL.QUEUE_MARK");
}
if (System.Threading.Thread.CurrentThread != primaryThread)
{
System.Threading.Monitor.PulseAll(this);
}
}
}
