On Sun, 2008-08-31 at 17:10 +0200, Jochem Maas wrote:
> Robert Cummings schreef:
> > On Sun, 2008-08-31 at 12:12 +0200, Per Jessen wrote:
> >> Robert Cummings wrote:
> >>
> >>>> That's easily taken care of. Instead of a cron-job, you could have a
> >>>> script running as a daemon, checking for emails to be sent every
> >>>> 5mins.
> >>> That's the same as running a cron every 5 minutes except now you also
> >>> need to detect if your daemon dies :) On the plus side though, you
> >>> eliminate the overhead of starting up the script every 5 minutes :)
> >> It is not the same as it will prevent multiple scripts running
> >> concurrently in case a batch of emails takes longer that 5 minutes.
> >> Checking if the daemon dies - I guess it's a matter of taste or
> >> paranoia, but I don't think it's necessary when the script is
> >> sufficiently simple:
> >>
> >> #!/bin/sh
> >> while true
> >> do
> >> <yourscript>
> >> sleep 300
> >> done
> >
> > I accomplish the same with cron scripts by using locks with expiry.
>
> got an example? my cat skinning skills need to be improved, the cat
> won't like it but screw the cat, right?
<?php
$lockName = 'myLockForSomething';
$mLock = &$this->getService( 'lockManager' );
if( !($lock = &$mLock->get( $lockName )) )
{
$age = $mLock->getAge( $lockName );
if( $age > (60 * 60) ) // 1 hour
{
$mLock->forceRemoval( $lockName );
}
}
if( !($lock = &$mLock->getRef( $lockName )) )
{
exit;
}
// Do stuff... current process has the lock.
$lock->destroy();
?>
Never really thought to until now... but I could easily roll the age
check into the lock code itself and pass a parameter to the get()
method. It would shrink the above code considerably.
I implemented my own lock class which uses directory creation and the
return value to determine if the lock was successful. Unlike file
creation (or so I read several years ago) directory creation is atomic
and works across NFS. As an added benefit, I'm able to store lock
related data into the lock directory as files.
Cheers,
Rob.
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