timer in thread (ie createwaitabletimer for 9.x)

[Neil Hosgood]

Hi people,

How does one create a timer in a thread that does not have
a dialog? pretty much like CreatWaitableTimer under NT.
Cant use sleep cos I am using waitForMultipleObjects and waiting
for a button click aswell as a timer. I can create a timer in
the main thread and set an event to triger the waitfor when the
timer fires, but the thread cant reset the timer in the
main thread when its done ?

Any ideas ?

TA.

NJH.




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[Michael Mattias]

Instead of a timer in the "worker" thread, you can leave your timer in the mian thread. When the WM_TIMER message is received, you do a SetEvent of an event you created with CreateEvent.

The "worker" thread does its "Waitfor" on the Event, rather than on the timer.

MCM

[Neil Hosgood]

Michael.

I thought of that, but from what I read the second thread
cant reset the timer, Only the thread that owns the dialog
can ?
when the timer fires I need to be able to kill the timer
so it doesnt fire again while the second thread is still
working from the first time the timer fired. When the second
thread is done it needs to restart the timer and go back into
a waitstate.

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[Guest]

In your Timer process (don't use WM_TIMER message for the timer) you could call SetEvent as michael suggested then in the timer proc wait for another event (WaitForSingleObject) your thread will signal with SetEvent when it has finished it task. Depending upon the timing required you might even want to look at the multimedia timers. They are very accurate and better for this type of use I feel.

Ron

[Neil Hosgood]

Thanks Ron, will have a good look at that.
I take it that by using a separate timer proc the
waitforsingleobject wont hold up the main message queue ?




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[Guest]

That's correct. Or in another variation using the WM_TIMER message, you could let the timer continue firing while waiting for the worker thread to signal an event when it has completed its work. Until the event is signaled by the thread the code associated with the WM_TIMER message does nothing.

[Neil Hosgood]

That did it, and with alot less code changes
thanx guys.

N.

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