<?php// 使用Memache 作为进程锁 class lock_processlock{ // key 的前缀 protected $sLockKeyPre; // 重试间隔 protected $iLockRetryInterval; //重试次数 protected $iLockRetryCount; //锁的过期时间 protected $iLockCacheTimeout; // 锁过期后的回调函数 protected $onLockTimeoutFunc; // memache 的实例 protected $oMemcache; // 存储memcache失败后重试次数 protected $iMemcacheRetryCount; public function __construct ($onLockTimeoutFunc=NULL) { $aLockConfig = get_config('', 'lock'); $this->sLockKeyPre = self::LOCK_KEY_PRE; $this->iLockRetryInterval = self::LOCK_RETRY_INTERVAL; $this->iLockRetryCount =self::LOCK_RETRY_COUNT; $this->iLockCacheTimeout = self::LOCK_CACHE_TIMEOUT; $this->iMemcacheRetryCount = self::LOCK_CACHE_TIMEOUT; if(!$onLockTimeoutFunc){ // 如果加锁不成功则调用回调函数,如果没有回调函数,使用本类中所带的 $onLockTimeoutFunc ='onLockTimeout' ; } $this->onLockTimeoutFunc = $onLockTimeoutFunc; } /** 连接memcache 服务器 */ public function connect() { if (! isset ( $this->oMemcache )) { $this->oMemcache = new Memcache (); $this->oMemcache->connect ( '127.0.0.1', 11211 ); } return $this->oMemcache; } public addMemcache($sKey, $sValue, $iTimeout){ for($i= 0 ; $i<$this->iMemcacheRetryCount){ $bRes = $this->oMemcache->add($sKey, $sValue, $iTimeout); if($bRes){ return true ; } // 如果加锁不成功,sleep 之后,从新加锁 usleep($this->iLockRetryInterval*1000); } return false ; } public function lock($sLockID){ $oMemcache = $this->connect(); $sKey = $this->sLockKeyPre . $sLockID; // 加锁如果不成功可以多试几次 for($i = 0 ; $i <$this->iLockRetryCount ; $i++){ // 这里设置value 的值可以随便设置 if($this->addMemcache($sKey,'1',$this->iLockCacheTimeout)){ return true ; } // 如果加锁不成功,sleep 之后,从新加锁 usleep($this->iLockRetryInterval*1000); } // 若还不成功,则加锁失败,调用回调函数,.也就是失败后需要处理的操作 if(is_callable($this->onLockTimeoutFunc)){ // 调用函数 call_user_func($this->onLockTimeoutFunc); } } public function unlock($sLockID){ $oMemcache = $this->connect(); $sKey = $this->sLockKeyPre . $sLockID; // 删除key return $this->oMemcache->delete($sKey); } /** 如果加锁不成功,则执行如下操作 */ public function onLockTimeout(){ echo ("加锁超时"); } }// 应用实例 $oLock = new lock_processlock(); $lockResource = "test"; // 加锁 $oLock->lock($lockResource); // 解锁 $oLock->unlock($lockResource);