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SetTimer Priority

Posted on 2001-07-17
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Last Modified: 2013-12-03
Hi

How do you set a priority for a timer, I want to make an IDLE timer, but is'nt there a function like

.SetPriority(LOW);

CB.
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Question by:win32
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11 Comments
 

Expert Comment

by:_ov
ID: 6290152
Hmmm... You can move it to the separate thread and set priority for it.
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LVL 32

Accepted Solution

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jhance earned 50 total points
ID: 6290264
A timer doesn't "run" like a thread.  It's set.  When it happens, Windows will send a message.  There is no priority for the timer itself.  The place for priority is in the thread that gets the timer message (WM_TIMER).  Set that thread to be a low priority.
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Expert Comment

by:NickRepin
ID: 6291188
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Author Comment

by:win32
ID: 6292543
But I am having some prublems, When my timer starts, my Redraw functions does'nt seem to work. eg. I click a button, but the button is not redrawn.
CB.
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Expert Comment

by:_ov
ID: 6292595
AFAIR WM_PAINT is a low-priority message too. Could you describe your problem in more detail?
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Author Comment

by:win32
ID: 6293761
Only problem is sometimes a bit of flicker, because of the Paint() and Timer() running "at the same thread" at same time!

If a timer is running, can you reset it ?.. I mean, if i set the timer to 2 sec, and 1 second has elapsed, and for some reson I want to reset the timer, so it starts from the time 0 sec..

How can I do that ?, I mean I can't realy kill the timer it does'nt work, the timer will not be killed untill the next event.

Or can I kill the timer in a way, so I won't have to wait for the next event ?
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Expert Comment

by:_ov
ID: 6293851
Of course you can kill the timer.

You can use this pair: KillTimer() SetTimer() even if you have no any timer at this time.

So, you can use something like this:
void ResetTimer(HWND hWnd, int id, int elapse) {
  KillTimer(hWnd, id);
  SetTimer(hWnd, id, elapse, NULL);
}
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LVL 7

Expert Comment

by:peterchen092700
ID: 6294912
a) can you explain your problem? I'd like to doubt that two messages are handled at the same time in the same thread...

What windows does is: When Message Queue is empty, it sends WM_PAINT messages to windows with invalid regions. Only after that, pending WM_TIMER messages are sent.

Is all your painting in the WM_PAINT handler, or are you doing some of the painting in WM_TIMER? (you shouldn't....)


Peter
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LVL 7

Expert Comment

by:peterchen092700
ID: 6294926
BTW... your WM_TIMER handler can also set a flag, that is processed & cleared in the Idle handler

VC++ frameworks (MFC, ATL) provide OnIdle handlers somewhere, or if you are in raw Win32, you might need to adjust your message loop for this.

Peter
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Author Comment

by:win32
ID: 6297343
My painting is not in the Timer, but the timer makes some changes in some variables and call RePaint();

CB.
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LVL 7

Expert Comment

by:peterchen092700
ID: 6297896
what is repaint?? You should just call InvalidateRect to invalidate theregions that need repainting.
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