File locking

[Bassoukos Tassos]

On Wed, 25 Aug 1999, Michalis Kabrianis wrote:

> 1) Thanks.
> Ayta ta iksera (kai malista to oti afaireis ena arxeio alla ta inodes
> paramenoun valid to antimetwpisa poly prosfata - molis xthes, kai exasa ligo
> ton bousoula mexri na to katalabw), alla pali den yparxei tropos na min kanw
> open ena idi locked arxeio. H na min kanw remove apo allo process, ena arxeio
> poy to prwto process den prolabe na anoiksei. Dystyxws diladi den mou lynoun to
> problima. Ektos an den katalaba kati.

Katarxhn, as arxisoume apo ta apla, giati me mperdepses ligo: xwris kernel
modification den yparxei 'mandatory' locking, dhladh ena non-locking-aware
programma mporei kallista na paei kai na grapsei panw se locked
arxeia/perioxes arxeiwn, kai sy to mono pou mporeis na kaneis einai na
alla3eis ta permissions tou arxeiou se -w[0] ... 

Ean twra milas gia programmata pou einai locking-aware[1], tote den
yparxei problhma, giati aplws grafeis ena wrapper gyrw apo thn open() me
onoma open_and_lock() pou kanei ayto akribws.

Tassos
[0] exw thn entypwsh pws ef'oson anoi3eis ena arxeio ws rw kai to kanei
    -w, 8a synexiseis na mporeis na grafeis apo to syngekrimeno file
    descriptor. Einai swsto ayto (kaneis ekei e3w? Ricudi?)
[1] diabase: ta egrapses esy gia enan syngekrimeno skopo, px gia na
    elengxeis apo pollous xrhstes thn idia bash etc.

-- 
Bassoukos Tassos   +30 31 996011 / +30 93 7109954
 Computer Shaman and Informatics Thaumaturge

The IQ of any group is the lowest individual
IQ divided by the number of feet. - PCDC in /.


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