Re: Re: skinning a cat

Jochem Maas wrote: > Per Jessen schreef: >> Jochem Maas wrote: >> >>>> lockfile=/var/lock/<xxxx>/file >>>> # clear out a lock older than 60mins >>>> find $lockfile -cmin +60 | xargs rm >>>> test ! -f $lockfile && ( >>>> touch $lockfile >>>> <run some php> >>>> rm -f $lockfile >>>> ) >>> wouldn't creating a dir be better here? (with regard to atomicity) >>> >> >> I haven't thought it through, but I don't think it would change >> anything. > > directory creation is garanteed to be atomic, even across NFS, or > so Rob said. Maybe so, but to avoid a race-condition, you need the test+touch sequence to be atomic. /Per Jessen, Zürich