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unlying

Hello. Currently i have to use timers in my app. I was confused after that because it doesn't works as it should works. We expect events on same time every time when timer tick. But it isn't same time.
Here it is very simple app

timer = Timer.new(100, 10)
 
function onTimer(e)
	print(os.timer())
 
end
 
timer:addEventListener(Event.TIMER, onTimer)
timer:start()

Os.timer() should be printed every 100ms. It is. But not every time.

532.43867148027
532.53866848176
532.63867357923
532.7386786767
532.83868437387
532.93868437387
533.05472820008
533.1547488898
533.25475128861
533.37170576224

For me it is not problem now, because i check current position of sound in my app. But may be you now how to fix this?

ar2rsawseen

OR os.timer is not "precise" as it should be >:)
but seriously, it probably could depend on performance of the app. If app microfreezes or gets blocked for some milliseconds, timer is delayed.

Magnusviri

Look at it this way.

532.4386
532.5386
532.6386
532.7386
532.8386
532.9386
533.0547 <- garbage collection probably occurred
533.1547
533.2547
533.3717 <- garbage collection probably occurred

If you want that precise of a timer you probably should calculate the delta every time.

atilim

In your example, the difference between each timer event is about 100-110 milliseconds. This is very normal in event-driven systems. In this case, you don't expect to see exact 100 millisecond intervals.

atilim

@ar2rsawseen :D you can't beat os.timer() :)

unlying

It is so small because of app. It is just example. When i try timers in real app(i have to show something each 500ms), there are strong assynchronization.

atilim

Maybe you want to register an ENTER_FRAME event and check the time with os.timer() but still in that case your precision will be 1000/60fps ~= 16ms

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