Here's a basic draft project for clock_gettime(CLOCK_MONOTONIC, ...)
http://sert.homedns.org/hs/mnsec/
http://sert.homedns.org/hs/mnsec/dist/mnsec-1.0.0.tar.gz
It could be extended to cover other clock types than just monotonic.
Regards,
CS
2009/1/9 John Goerzen
Steve Schafer wrote:
On Fri, 09 Jan 2009 11:01:18 -0200, you wrote:
I'm writing a program that will read medical signs from many patients. It's important to have a precise measure of the time interval between some signs, and that can't depend on adjustments of time. (Supose my software is running midnight at the end of a year with leap seconds. I would get wrong time intervals.)
If you really need that level of accuracy, there is nothing available on an off-the-shelf machine that will do the job. You need an independent timekeeping source of some kind, one that is not subject to the vagaries
I'm not sure that the original question implied *that* level of need.
Linux has High-Resolution Timers (HRTs) that may be appropriate. See the manpage for clock_gettime(), which defines these HRTs:
CLOCK_REALTIME System-wide real-time clock. Setting this clock requires appropriate privi- leges.
CLOCK_MONOTONIC Clock that cannot be set and represents monotonic time since some unspeci- fied starting point.
CLOCK_PROCESS_CPUTIME_ID High-resolution per-process timer from the CPU.
CLOCK_THREAD_CPUTIME_ID Thread-specific CPU-time clock.
CLOCK_MONOTONIC, in particular, looks suitable. Using it could be a matter of just a few quick likes in FFI.
I don't know if Windows has similar features.
-- John _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe