High Resolution Timers
BlitzMax Forums/BlitzMax Programming/High Resolution Timers
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| Hi Guys n Gals, I was playing around a bit last night and came up with something relatively useful- a high resolution timer class for Win32. It can be seen here: http://www.blitzbasic.com/codearcs/codearcs.php?code=1909 If you Linux/MacOS users can wrap these same functions to make it Cross Platform, that'd benefit everyone here. Also, any problems, or potential probs, lemme know :D [edit] There's some other code on the forum by REDi which seems remarkably similar. Whilst I have seen this code before, It wasn't around when I coded mine! :O |
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| I don't know how yours works but regretably I'm now dubious of such timers due to Dual core chips and different CPU stepping blah blah having a dodgy affect on such times...:-( |
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| I have dual core, and this seems to work on mine and non-dual core. You have to use the provided commands to get an accurate frequency reading and then use that *carefully* (long int maths- avoid division where possible. Even I used more division than I would have liked...) to get accurate results. |
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| yeah I'm not trying to dis your code dude, I just looked into it a while ago and kept finding info like this: http://www.virtualdub.org/blog/pivot/entry.php?id=106 |
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| All you have to do is use TimeGetTime() as a backup and if QueryPerformanceCounter appears to have jumped a few seconds compared to the value returned by TimeGetTime(), reset it with what you got from TimeGetTime(). You still get the nanosecond accuracy, but you can spot and correct jumps. |
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| interesting! |
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| Nono, I didn't think you were Grey :) That was an interesting read. I'll do more testing of my own and try it on a laptop or two. the TimeGetTime trick sounds neat for a failsafe :) |
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