[fpc-pascal]High resolution timers on linux ?

[kenneth at computercafeen.dk]

486 ?

This piece of software is meant to be running on a 
SingleBoardComputer running a Intel 386EX Microprocessor @ 25 Mhz
with a 2.2."something" kernel

I suppose it still can use the usleep function, 
if it is implementet into fpc ?

Or if the nanosleep function works on old x386 type processors ?


marcov at stack.nl (Marco van de Voort) wrote ..
> > On Mon, 27 Aug 2001, Kenneth Due wrote:
> > 
> > > Hello list
> > > 
> > > I need some way to determine when 1/10000 sec has passed
> > > 
> > > I suppose it can be done with the timerchip in the PC - but how ?
> > > 
> > > anyone ......
> > > 
> > 
> > man usleep
> > 
> > usleep(X) suspends the execution of calling process for X microseconds
> > (10^-6 sec). The accuracy may not be (== is not) 100% due to the
> > multitasking nature of UNIX-type operating systems.
> > 
> > There are also setitimer() and getitimer()-functions that can be used
> > to get a callback-type timed action.
> 
> nanosleep in the Unix/Linux unit works for both Linux and FreeBSD.
> 
> To properly work, it needs a machine with the rdtsc instruction (IIRC later
> Intel 486's and all but the old pentiums)
> 
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