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Hight resolution portable timer?

Started by Ey-Lord Jan 5, 2007 at 1:30 PM 8 replies 1.7k views

Original Post

Jan 5, 2007 at 1:30 PM

Hello everyone, i currently use something like this :


	QueryPerformanceCounter(&TimeNow_);
	// *1000 because Frequency_ is in second .
	TimeElapsed_ = 1000.0 * (TimeNow_.QuadPart - TimeLast_.QuadPart) / Frequency_.QuadPart;
	TimeLast_= TimeNow_;

Since i need to include windows.h it's obviously not portable ... do you know something as acurate portable ? Thanxs .

Anon Mike

Jan 5, 2007 at 1:42 PM

There isn't any such thing as a portable high-resolution timer. There may be high-resolution timer functions in various third-party libraries, that would probably be your best bet. The closest you'll get in the standard libraries is probably the clock() function.

dbzprogrammer

Jan 5, 2007 at 1:47 PM

SDL friend.

dmail

Jan 5, 2007 at 2:17 PM

I am not sure what the precision of the boost timer is, but with a couple of defines you can use platform specfic timers. See this for unix timers.

Ey-Lord

Jan 5, 2007 at 2:45 PM

I will doublecheck the precision of SDL, i dont remember what it was and if its good enought i'll stick with that, i'm not a big fan of platform specific function if it can be avoided ;)

dmail

Jan 5, 2007 at 2:50 PM

Quote:
Original post by Ey-Lord
I will doublecheck the precision of SDL, i dont remember what it was and if its good enought i'll stick with that, i'm not a big fan of platform specific function if it can be avoided ;)

It's up to you but your reasoning is a little strange. Boost timer and SDL timer are just wrappers for platform specific timers.

WilyCoder

Jan 5, 2007 at 3:57 PM

Time routines are one of the few things I have had to write multiple versions of, for each platform.

Its not that bad.

b2b3

Jan 6, 2007 at 7:40 AM

On Linux you can use clock_gettime function to obtain time with higher precision than gettimeofday. It supports several different timers and should be available on all newer Linuxes.
To use it, you have to link your program with librt.

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