High resolution clock

addy86 · 09-03-2005, 09:55 AM

How can I get a high resolution time, ie. something similar to times(), but at a much higher resolution (microseconds would be ideal, milliseconds are too long). Requirements:
1) It doesn't have to be wall time.
2) It mustn't be processor time but real time.
3) The above described resolution.
4) If possible, it should be POSIX-compliant or similar, ie. not only available on Linux.

I couldn't find anything fitting, neither with Google nor in this forum.

Linux.tar.gz · 09-03-2005, 10:05 AM

Matir · 09-03-2005, 10:57 AM

Have you looked at setitimer()?

addy86 · 09-03-2005, 02:13 PM

@Matir: No, I haven't, but it seems that setitimer() is a timer, but I need a clock.

@Linux.tar.gz: What frequency does the RTC have? For mplayer I have set it to 1024, I suppose these are Hertz. That's as inaccurate as SDL's SDL_GetTicks() (I'm programming a game and need a time source to measure fps).

I remember there were two API functions in Windows: QueryPerformanceCounter() and QueryPerformanceFreq(). Is there anything similar in Linux?

Linux.tar.gz · 09-03-2005, 11:26 PM

Mmm i suggest you to post another thread named "Need a time source to measure fps", and link it to this one.