PHP Buzz Forum - PHP Command Line - Avoid several Instances of your App.

Articles |
News |
Weblogs |
Books |
Forums

Artima Forums | Articles | Weblogs | Java Answers | News

Sponsored Link •

PHP Buzz Forum
PHP Command Line - Avoid several Instances of your App.

0 replies on 1 page.

Welcome Guest
Sign In

Back to Topic List

Reply to this Topic

Search Forum

Threaded View


Previous Topic		Next Topic

Flat View: This topic has 0 replies on 1 page

Pure-PHP

Posts: 20
Nickname: purephp
Registered: Mar, 2005

Pure-PHP is kind of Blog about PHP, and unconventional methodes to boost PHP-apps

PHP Command Line - Avoid several Instances of your App.

Posted: Mar 21, 2005 11:04 PM

This post originated from an RSS feed registered with PHP Buzz by Pure-PHP.
Original Post: PHP Command Line - Avoid several Instances of your App. Feed Title: Pure PHP - PHP unconventional Feed URL: http://www.iran-fun.com/ Feed Description: Unconventional methodes to boost php apps	Latest PHP Buzz Posts Latest PHP Buzz Posts by Pure-PHP Latest Posts From Pure PHP - PHP unconventional

Since PHP 4, you can also write command line apps in php. If you have a critical app, and you want to avoid several, or mor than one instance of your app, to run, you can use the following class. It works only on unix and linux operating sytems.

Usage:

<?php

inlude("ProcessHandler.class.php");
if(ProcessHandler::isActive()){
   die("Already running!\n";);
}else{
   ProcessHandler::activate();
   //run my app
}

?>

<?php

if (!defined('PID')) {
    define("PID","/tmp/pid.php");
}
class ProcessHandler{
    function isActive(){
        $pid = ProcessHandler::getPID();
        if($pid == null){
            $ret = false;
        }else{
            $ret = posix_kill ( $pid, 0 );
        }
        if($ret == false){
            ProcessHandler::activate();
        }
        return $ret;
    }
    function activate(){
        $pidfile = PID;
        $pid = ProcessHandler::getPID();
        if($pid != null && $pid == getmypid()){
            return "Already running!\n";
        }else{
            $fp = fopen($pidfile,"w+");
            if($fp){
                if(!fwrite($fp,"<"."?php\n\$pid = ".getmypid().";\n?".">")){
                    die("Can not create pid file!\n");
                }
                fclose($fp);
            }else{
                die("Can not create pid file!\n");
            }
        }
    }
    function getPID(){
        if(file_exists(PID)){
            require(PID);
            return $pid;
        }else{
            return null;
        }
    }
}

?>

Read: PHP Command Line - Avoid several Instances of your App.

Previous Topic

Next Topic


	Web Artima.com