U++ framework: U++ Callbacks and Timers » TimerCallBack interval resolution

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Re: TimerCallBack interval resolution [message #58036 is a reply to message #58030]

Sat, 22 January 2022 19:32

mirek
Messages: 14290
Registered: November 2005

Ultimate Member

deep wrote on Fri, 21 January 2022 07:39

Hi Didier,

My issue is not about time profiling.

I am looking at time interval and repeatability of time interval.

When I set TimerCallback time value between -22 to -39 ms. I get interval of 40 ms.
Depending on value of time I set I get time interval in multiple of 20 ms.

If I want 30 ms. time interval for timercallback I am not getting it. I get greater time interval - multiple time interval of 20 ms.

Interval repeatability is 1ms. which is okay for me.

It is supposed to be about 20ms by design and it is not even guaranteed. If you need more precise timing, you need to run it in separate thread.

More details: GUI timer is run each time after the set of GUI events is processed and queue becomes empty. Those 20ms actually apply for the case that there are no events - if there are no event for 20 ms, timer is invoked. That also means if the GUI event (e.g. keystroke) takes more than 20ms to process, the interval can be actually much bigger than 20ms.

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[Message index]

		TimerCallBack interval resolution By: deep on Wed, 19 January 2022 07:41
		Re: TimerCallBack interval resolution By: Tom1 on Wed, 19 January 2022 13:19
		Re: TimerCallBack interval resolution By: deep on Wed, 19 January 2022 14:27
		Re: TimerCallBack interval resolution By: Tom1 on Wed, 19 January 2022 14:40
		Re: TimerCallBack interval resolution By: Didier on Thu, 20 January 2022 21:43
		Re: TimerCallBack interval resolution By: deep on Fri, 21 January 2022 07:39
		Re: TimerCallBack interval resolution By: mirek on Sat, 22 January 2022 19:32
		Re: TimerCallBack interval resolution By: deep on Mon, 24 January 2022 09:56
		Re: TimerCallBack interval resolution By: mirek on Mon, 24 January 2022 10:47
		Re: TimerCallBack interval resolution By: superdev on Wed, 04 January 2023 20:19
		Re: TimerCallBack interval resolution By: mirek on Thu, 05 January 2023 09:29
		Re: TimerCallBack interval resolution By: superdev on Fri, 06 January 2023 16:20
		Re: TimerCallBack interval resolution By: mirek on Sat, 07 January 2023 09:10
		Re: TimerCallBack interval resolution By: superdev on Sat, 07 January 2023 11:05
		Re: TimerCallBack interval resolution By: mirek on Sat, 07 January 2023 13:15
		Re: TimerCallBack interval resolution By: superdev on Sun, 08 January 2023 06:38
		Re: TimerCallBack interval resolution By: superdev on Tue, 10 January 2023 19:12
		Re: TimerCallBack interval resolution By: mirek on Wed, 11 January 2023 10:36
		Re: TimerCallBack interval resolution By: superdev on Wed, 11 January 2023 18:17

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