Re: Timer Priority

"Alexander Nickolov" <>
Tue, 3 Jul 2007 11:25:18 -0700
Actually, for a thread-based timer I'd suggest CreateWatableTimer
and friends instead. Then you can set the priority of your timer
thread yourself, unlike with the multimedia threads where the
multimedia timers are fired.

Alexander Nickolov
Microsoft MVP [VC], MCSD

"William DePalo [MVP VC++]" <> wrote in message

"JoDeGr8" <> wrote in message

What will be the priority of the timer thread created using the
function SetTimer? Does it have a high priority? How can i increase
the priority of the timer thread?

If you want a timer to fire in a background thread, check the docs for
timeSetEvent() and perhaps timeBeginPeriod() and timeEndPeriod(). The docs
are silent on much of the implementation detail - for example they don't
say if all the callbacks for a "periodic" timer fire in the same thread or
not - except to say that the timer always fires in a thread different from
the caller's.

In any case it's way to roll your own timer if you have strong feeling as
to priority and threading model. Just call _beginthreadex() or
AfxBeginThread() in an MFC application and then have a thread procedure
something like this which I have not compiled:

#include <windows.h>
#include <mmystem.h>

unsigned __stdcall TimerThreadProc(void *pv)
 SetThreadPriority( GetCurrenThread(), SomeGoodPriority);

 // timeBeginPeriod(1); // Uncomment for high resolution timer

 while ( YourTerminationCondition )

  TimerCallback(Yada, Yada, Yada);

 // timeEndPeriod(1); // End period only if begun above

 return 0;


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