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


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