poll

[Liakakis Kostas]

On Fri, 2 May 1997, Alexios Chouchoulas wrote:

> struct timeval {
>         int     tv_sec;         /* seconds */
>         int     tv_usec;        /* microseconds */
> };
> 
>   Ara mporeis na oriseis kathysterhseis se akribeia 1e-6 sec. Fantazomai oti

Oxi, to oti mporei na ypostirizei usec, den shmainei automata oti ka0e 
ylopoihsh dinei tetoia akribeia. Synh0os yparxoun kai software kai 
hardware periorismoi. Software, px ekeino to #define HZ 100 se kapoio 
header arxeio tou linux kernel. Auto periorizei thn akribeia tou 
timestamp tou kernel se 10ms  (0.01sec, 1/100). Hardware opos to rtc 
chipaki pou exei sxedon ka0e motherboard kai (shmfona me ta grafomena 
ston rtc driver ston /linux/Documentation) den mporei na bgalei pano apo 
8192Hz.

Se alles arxitektonikes mporei na einai efikth h akribeia usec. Se intel 
pantos einai komati adynath... pros to paron.

-K.

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