lock( ) == FALSE ) error("Locking failed"); //-- //Do your work here //-- //unlock $lock->unlock(); =================================================================== */ class ExclusiveLock { protected $key = null; //user given value protected $file = null; //resource to lock protected $own = FALSE; //have we locked resource function __construct( $key ) { $this->key = $key; //create a new resource or get exisitng with same key $this->file = fopen(RUN_DIR.DS."Lock".DS."$key.lockfile", 'w+'); } function __destruct() { if( $this->own == TRUE ) $this->unlock( ); } function lock( ) { if( !flock($this->file, LOCK_EX)) { //failed $key = $this->key; error_log("ExclusiveLock::acquire_lock FAILED to acquire lock [$key]"); return FALSE; } ftruncate($this->file, 0); // truncate file //write something to just help debugging fwrite( $this->file, "Locked\n"); fflush( $this->file ); $this->own = TRUE; return $this->own; } function unlock( ) { $key = $this->key; if( $this->own == TRUE ) { if( !flock($this->file, LOCK_UN) ) { //failed error_log("ExclusiveLock::lock FAILED to release lock [$key]"); return FALSE; } ftruncate($this->file, 0); // truncate file //write something to just help debugging fwrite( $this->file, "Unlocked\n"); fflush( $this->file ); } else { error_log("ExclusiveLock::unlock called on [$key] but its not acquired by caller"); } $this->own = FALSE; return $this->own; } } WebSVN - freenet-router - Blame - Rev 2 - /trunk/freenet-router/var/www/freenet-router/Framework/Core/ExclusiveLock.php

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