From: "siegfried" <[EMAIL PROTECTED]>
> I have a cron job running perl and it is taking a very long time --
> sometimes over 24 hours.
>
> How can I have cron schedule my job daily, or even hourly, and have the
perl
> code exit if a previouse instance of the job is still running?
>
> Some have suggested creating a file in /tmp and checking it before
> proceding. But what if a cron job exits prematurely, perhaps because of a
> division by zero, and does not delete the /tmp file?
>
> How do I set up a signal handler to gaurentee that the /tmp/do_not_run_yet
> file gets deleted when the cron job exits?
>
Hi,
Try something like:
use File::Pid;
my $pid = File::Pid->new();
exit if $pid->running;
my $exit;
$SIG{INT} = $SIG{BREAK} = $SIG{HUP} = sub {$exit++};
$pid->write() or die "Can't write - $!";
while (!$exit) {
#do program
}
END {
$pid->remove() if $pid->pid() == $$;
}
But if something bad happends like a power off or something like that, the
pid file might be left undeleted.
The problem of File::PID is that it doesn't delete the pid file if the PID
number found inside it is not the pid of a running process.
And in that case the program might not start, or start for more times... I
don't remember well what happend.
But maybe this is not a correct way of using File::PID...
Teddy
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