[Xerte-dev] Re: Lockfiles

[David Goodwin]

On 28 Feb 2012, at 23:50, Pat Lockley wrote:

> Stop concurrent access
> 

$fp = fopen('/path/to/something.xml.lock', 'w');
if(flock($fp, LOCK_EX, FALSE)) {
     // we have an exclusive lock on someting.xml.lock; within the scope of this webserver.
}
else {
    // someone else has access.
}

See also http://php.net/flock  - note it's behaviour is slightly different on Windows, and it wouldn't scale past more than one web server.


David.

> On 28 Feb 2012, at 23:45, David Goodwin <david at palepurple.co.uk> wrote:
> 
>> What do you mean by "lock an XML file down"
>> 
>> Are you trying to stop concurrent access to it, or something else?
>> 
>> David.
>> 
>> On 28 Feb 2012, at 22:26, Pat Lockley wrote:
>> 
>>> Hi all,
>>> 
>>> Thoughts on how to lock an XML file down?
>>> 
>>> I think it might be the session expiring, or the js might not fire properly. I am pretty sure the lockfile remove code doesn't use the session anymore.
>>> 
>>> 
>>> 
>> 
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'Business Web Application Development and Training in PHP'

http://www.palepurple.co.uk   
Office: 0845 0046746     Mobile: 07792380669 

Follow us on Twitter: @PalePurpleLtd