first commit

engine/lib/Lock.class.php

@@ -0,0 +1,51 @@
+<?php
+class Lock{
+	const LOCKTIME = 3;
+	private static $locked = array();
+	private static $memcache = false;
+	private static function init(){
+		if( self::$memcache == false ){
+			self::$memcache = memcache_init();
+		}
+	}
+	public static function add( $key ){
+		self::init();
+		if( self::$memcache !== false ){
+			$time = self::LOCKTIME;
+			while( $time > 0 ){
+				if( memcache_add( self::$memcache , $key , 'Locking' ,false , self::LOCKTIME ) ){
+					self::$locked[$key] = 1;
+					return;
+				}else{
+					$time--;
+					sleep(1);
+				}
+			}	
+		}	
+	}
+	public static function del( $key ){
+		if( self::$locked[$key] ){
+			self::init();
+			if( self::$memcache !== false ){
+				if(  memcache_delete( self::$memcache , $key  ) ){
+					unset(  self::$locked[$key] );
+					return true;
+				}
+			}
+		}
+		
+	}
+	public static function delAll(){
+		if( self::$locked && self::$memcache ){
+			foreach( self::$locked as $k => $v ){
+				if( memcache_delete( self::$memcache , $k  ) ){
+					unset(  self::$locked[$k] );
+				}
+			}
+		}
+	}
+}
+function autounLock(){
+	Lock::delAll();
+}
+register_shutdown_function( 'autounLock' );