poll

[Liakakis Kostas]

On Fri, 2 May 1997, Giannis Tsakiris wrote:

> malista! kai giati egw edw kai ena xrono sxedon nomiza oti n
> tv_usec antiprosopeve ari8mo ekatostwn tou defteroleptou ???
> (apokliontas tin etsi apo metriseis POLY megalis akrivias)
> thanx pou mou anoikses ta matia toso kairo den eixa ti leksi MICRO.

To 'u' sto tv_usec, moiazei to ellhniko 'm' pou einai to symbolo to 
pro0ematos micro. 

> wstosw, dokimasa tin akrivia tis select() se ena sparcstation 1+
> kai paratirisa oti i akrivia tis einai aparadekti gia times stin
> timeval mikroteres twn 10.000 microsecond. Gia na eksigisw afto to

Me alla logia sou dinei akribeia 10msec (milli...) Oti akribos pairneis 
kai sto linux.

> gegonos fantazomai oti i diekpereosi mia klisis select() 8a apetei
> to ligotero 10.000 microsec, opote den exei noima na bazoume times 

Oxi, mporei na pairnei poly ligotero, alla esy empisteuesai apo 4hs ta3hs 
kai pano pshfia sto tv_usec.

> mikroteres apo aftin (se isxirotera mixanimata isws o elaxistos xronos
> ti select() na einai mikroteros).

Einai poio poly 0ema arxitektonikhs kai kernel.

> Pantws gia metriseis me akrivia ekatostou defteroleptou opos blepw twra
> i select() einai mia POLY kali lisi afou einai kai portable :)

Sou ta xalao tora alla oute kai to ekatosto einai eggyhmeno pantou. An exei 
kapoios to standar as to ri3ei mia matia... Px. prosfata douleua (ti sto 
kalo, olous mazi mas epiase?) sthn Turbo C 2.0 kati kai xrhsimopoiousa 
thn ftime, ths opou to field gia milliseconds (10^-3 oxi -6) profanos den 
eixe kanena nohma, dioti se (logika) xronismeno loop  (eixe na kanei 
me io apo seiriakh) epairna times me kapos etsi: 0,0,0,0,50,60,0,0,...

A, mhn 3exname kiolas oti h select den ftiaxthke gia timer, alla gia 
asynxronh eisodo/e3odo... :-)

-K.
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