Make sure one copy of php script running in background -

i'm using cronjob run php script executed every 1 minute

i need make sure of copy running if php script still running after 2 minutes, cronjob should not run version.

currently have 2 options , see feedback , if have more options

option 1: create tmp file when php script start , remove when php script finish (and check if file exists) ---> problem me option if have php script crash reason, not run again (the tmp file not deleted)

option 2: run bash script 1 below control php script execution ---> looking can done within php

#!/bin/bash function rerun {         basedir=$(dirname $0)         echo $basedir/$1         if ps -ef | grep -v grep | grep $1;             echo "running"             exit 0     else             echo "not running";             /usr/local/bin/php $basedir/$1 &             exit $?     fi  }   rerun myphpscript.php 

ps: saw "mutex class" @ http://www.php.net/manual/en/class.mutex.php not sure if it's stable , tried it.

you might want use library ninja-mutex provides simple interface handling mutex. can use flock, memcache, redis or mysql handle lock.

below example uses memcache:

<?php require 'vendor/autoload.php';  use ninjamutex\lock\memcachelock; use ninjamutex\mutex;  $memcache = new memcache(); $memcache->connect('127.0.0.1', 11211); $lock = new memcachelock($memcache); $mutex = new mutex('very-critical-stuff', $lock); if ($mutex->acquirelock(1000)) {     // critical stuff      // , release lock after finish     $mutex->releaselock(); } else {     throw new exception('unable gain lock!'); }