Re: Re: skinning a cat

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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


--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php


[Index of Archives]     [PHP Home]     [Apache Users]     [PHP on Windows]     [Kernel Newbies]     [PHP Install]     [PHP Classes]     [Pear]     [Postgresql]     [Postgresql PHP]     [PHP on Windows]     [PHP Database Programming]     [PHP SOAP]

  Powered by Linux