shared-lockableclass.php

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<?PHP

class lockableClass
{
        var $lockfile;              
        
        function lock()
        {
                $maxtime = 600; // Wait for a maximum of 60 seconds before failing
                $i = 0;
                
                while( file_exists( $this->lockfile ) )
                {
                        usleep( 100 );
                        if( $i++ > $maxtime )
                        {
                                // If this lock is older than the possible execution time for PHP scripts on this server, something borked and we can safely unlock
                                if( filemtime( $this->lockfile ) < time() - ini_get( "max_execution_time" ) )
                                        break;
                                else
                                        return false;
                        }
                }
                touch( $this->lockfile );
                return true;
        }
        
        function unlock()
        {
                unlink( $this->lockfile );
        }
}
?>

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