Re: [chiPHPug-discuss] Run a script 5 min later

[Richard L. <ce...@l-...>]

fork/exec/sleep is rife with shoals for the newbie, so test thoroughly
if you go that route.

As far as the program execution time exceeding the interval of a cron
job goes, one easy thing to do is to have a mkdir() [which is
guaranteed atomic] something like this:

<?php
  $lock_file = "/var/run/thisscriptname.lock";
  $lock_stale = 60 * 5; // 5 minutes, for example
  if (file_exists($lock_file)){
    if (filemtime($lock_file) < time() - $lock_stale)){
      error_log("Removing stale lock: $lock_file");
      unlink($lock_file);
    }
    else{
      error_log("Aborting run due to lock: $lock_file");
      exit;
    }
  }
  mkdir($lock_file);
  while ( ... ){
    //process your records or whatever, and do this a LOT:
    touch($lock_file);
  }
?>

Damn!  touch() on a dir in Windows is broken?!  Sheesh.  You're on
your own for Windows, kid...   Sorry.
http://php.net/touch

On Tue, November 14, 2006 8:08 am, Jason Rexilius wrote:
> A job queue in the DB and a cron job that reads the DB and executes it
> is the best way probably.
>
> If you did not have access to cron on your system, another way would
> be
> to use fork/exec and have the child job sleep for 5 minutes and then
> check the state of a flat file or DB for cancellation.
>
>
> Hank Marquardt wrote:
>> Ohhh, one gotcha.   Never set your interval shorter than the time
>> the
>> job takes to run ... bad things happen :)
>>
>> On 11/13/06, *Hank Marquardt* < hma...@gm...
>> <mailto:hma...@gm...>> wrote:
>>
>>     cron job.   put a time stamp in the database, cron job checks
>> the
>>     timestamp and executes all records > 5 minutes ... if you
>> execute
>>     the cronjob every 5 minutes then the longest one would sit is
>> 9:59
>>     ... shorten the interval, shorten the length ...
>>
>>     Could do the same thing with timestamps on files if you don't
>> want
>>     to do the database thing.
>>
>>
>>
>>     On 11/13/06, * Terry* < ma...@ao...
>> <mailto:ma...@ao...>> wrote:
>>
>>
>>         How can I run a script 5 min after a user does something?
>>
>>         I want to give a user 5 minutes to cancel an action, and if
>> they
>>         don't
>>         then it actually happens. So, I'd like to run a script 5
>> minutes
>>         later,
>>         and have it perform any actions in the queue that are 5+
>> minutes
>>         old. 5
>>         min is not critical, but I don't think I should wait longer
>> than 10
>>         min.
>>
>>         What if it's only needed very infrequently?
>>
>>         I'm thinking the options are to use a cron job that runs
>> every few
>>         minutes, or, call the script with curl and have it sleep for
>> 5
>>         minutes
>>         first.
>>
>>         Terry
>>
>>
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>
> -------------------------------------------------------------------------
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> easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache
> Geronimo
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