I have a job that runs on the half-hour via cron to update a local database from a remote (ugh) ODBC-based
thing. Because I recently had to introduce some pauses ( via
sleep(1) to try and compensate for the remote server's latency ( it's swapping out like mad ... and errors out too frequently; my update never gets completed ), the job can now take longer than the window. I could run the updater on the hour instead ( which I may do if I can't find another solution ), but for now, I have something like this:
if (-e "/tmp/.updLock") {
open(FILE, "/tmp/.updLock");
my $line = <FILE>;
close(FILE);
chomp $line;
+
+
warn "PROCESS $line already running \n\n";
+
+
my @ps = `ps -p $line`;
my $count = @ps;
if ($count == 1) {
# IT's FAKING IT!!
+
+
warn "PROCESS $line not actually running. Lockfile deleted. \n\
+n";
unlink("/tmp/.updLock");
}
+
+
# we're still updating from last time
+
+
die "$0 still running\n\n" if $count > 1;
} else {
open(FILE, "> /tmp/.upLock");
print FILE $$;
close(FILE);
}
Thing is, my cron output sends me the
warn and
die messages, but the script is *still* running.
I do have an END block, but all is does is:
$dbh->disconnect() if defined( $dbh );
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