How to implement PHP process lock
<?php
/**
* CacheLock 进程锁,主要用来进行cache失效时的单进程cache获取，防止过多的SQL请求穿透到数据库
* 用于解决PHP在并发时候的锁控制,通过文件/eaccelerator进行进程间锁定
* 如果没有使用eaccelerator则进行进行文件锁处理，会做对应目录下产生对应粒度的锁
* 使用了eaccelerator则在内存中处理，性能相对较高
* 不同的锁之间并行执行，类似mysql innodb的行级锁
* 本类在sunli的phplock的基础上做了少许修改 http://code.google.com/p/phplock
* @author yangxinqi
*
*/
namespace Common\Business;
class PhpLock
{
//文件锁存放路径
private $path = null;
//文件句柄
private $fp = null;
//锁粒度,设置越大粒度越小
private $hashNum = 100;
//cache key
private $name;
//是否存在eaccelerator标志
private $eAccelerator = false;
/**
* 构造函数
* 传入锁的存放路径，及cache key的名称，这样可以进行并发
* @param string $path 锁的存放目录，以"/"结尾
* @param string $name cache key
*/
public function __construct($name,$path='lock\\')
{
$app_path = str_replace('ThinkPHP/', '', THINK_PATH);
$is_cli = php_sapi_name();
if($is_cli == 'cli' || $is_cli == 'cli_server')
{
$app_path = trim(APP_PATH, '.');
}
else
{
$app_path = $app_path . trim(APP_PATH, '.');
}
$path = $app_path.'/Common/Business/lockfile/';
if(!file_exists($path))
{
mkdir($path);
chmod($path,777);
}
//$path .= '/protected/runtime/cache/';
//判断是否存在eAccelerator,这里启用了eAccelerator之后可以进行内存锁提高效率
$this->eAccelerator = function_exists("eaccelerator_lock");
if(!$this->eAccelerator)
{
//$this->path = $path.($this->_mycrc32($name) % $this->hashNum).'.txt';
$this->path = $path.sha1($name).'.txt';
}
$this->name = $name;
}
/**
* crc32
* crc32封装
* @param int $string
* @return int
*/
private function _mycrc32($string)
{
$crc = abs (crc32($string));
if ($crc & 0x80000000) {
$crc ^= 0xffffffff;
$crc += 1;
}
return $crc;
}
/**
* 加锁
* Enter description here ...
*/
public function lock()
{
//如果无法开启ea内存锁，则开启文件锁
if(!$this->eAccelerator)
{
//配置目录权限可写
$this->fp = fopen($this->path, 'w+');
if($this->fp === false)
{
return false;
}
return flock($this->fp, LOCK_EX);
}else{
return eaccelerator_lock($this->name);
}
}
/**
* 解锁
* Enter description here ...
*/
public function unlock()
{
if(!$this->eAccelerator)
{
if($this->fp !== false)
{
flock($this->fp, LOCK_UN);
clearstatcache();
}
//进行关闭
fclose($this->fp);
}else{
return eaccelerator_unlock($this->name);
}
}
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