如何构建PHP队列系统

我不得不构建一个 PHP队列系统,并找到了这篇精彩的文章
http://squirrelshaterobots.com/programming/php/building-a-queue-server-in-php-part-1-understanding-the-project/和我用它来创建一个PHP队列系统,它非常容易设置和使用.

下面是queue.php的代码,从shell运行(puTTy或somesuch).

<?PHP 

//. set this constant to false if we ever need to debug
//. the application in a terminal.
define('QUEUESERVER_FORK',true);

//////// fork into a background process ////////
if(QUEUESERVER_FORK){    
    $pid = pcntl_fork(); 
    if($pid === -1) die('error: unable to fork.');    
    else if($pid) exit(0);        
    posix_setsid();    
    sleep(1);        
    ob_start();
}

$queue = array();

//////// setup our named pipe ////////
$pipefile = '/tmp/queueserver-input';

if(file_exists($pipefile))    
    if(!unlink($pipefile))         
        die('unable to remove stale file');

umask(0);


if(!posix_mkfifo($pipefile,0666))    
    die('unable to create named pipe');

$pipe = fopen($pipefile,'r+');

if(!$pipe) die('unable to open the named pipe');

stream_set_blocking($pipe,false);

//////// process the queue ////////
while(1){    

    while($input = trim(fgets($pipe))){        
        stream_set_blocking($pipe,false);        
        $queue[] = $input;    
    }    

    $job = current($queue);    
    $jobkey = key($queue);    

    if($job){        
        echo 'processing job ',$job,PHP_EOL;                
        process($job);                
        next($queue);        
        unset($job,$queue[$jobkey]);            
    }else{        
        echo 'no jobs to do - waiting...',PHP_EOL;        
        stream_set_blocking($pipe,true);    
    }        

    if(QUEUESERVER_FORK) ob_clean();

}

?>

最困难的部分是让pcntl功能在我的服务器上运行.

我的问题是“如果服务器必须重新启动,我如何才能自动启动作业？”