mutex yii怎么用？Yii源码解析之Mutex

Mutex组件允许并发进程的相互执行，以防止“竞争条件”。这是通过使用“锁定”机制实现的。每个可能并发的线程通过在访问相应数据之前获取锁来进行协作。

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用法示例：

if ($mutex->acquire($mutexName)) {    // business logic execution} else {    // execution is blocked!}

这是一个基类，应该扩展它以实现实际的锁机制。

下面我们看看其源码实现：

<?php/** * @link http://www.yiiframework.com/ * @copyright Copyright (c) 2008 Yii Software LLC * @license http://www.yiiframework.com/license/ */ namespace yii\mutex; use yii\base\Component; /** * The Mutex component allows mutual execution of concurrent processes in order to prevent "race conditions". * * This is achieved by using a "lock" mechanism. Each possibly concurrent thread cooperates by acquiring * a lock before accessing the corresponding data. * * Usage example: * * ``` * if ($mutex->acquire($mutexName)) { *     // business logic execution * } else { *     // execution is blocked! * } * ``` * * This is a base class, which should be extended in order to implement the actual lock mechanism. * * @author resurtm <resurtm@gmail.com> * @since 2.0 */abstract class Mutex extends Component{    /**     * @var bool whether all locks acquired in this process (i.e. local locks) must be released automatically     * before finishing script execution. Defaults to true. Setting this property to true means that all locks     * acquired in this process must be released (regardless of errors or exceptions).     */    public $autoRelease = true;//是否自动释放锁     /**     * @var string[] names of the locks acquired by the current PHP process.     */    private $_locks = [];//当前进程拥有的锁信息      /**     * 初始化Mutex组件     */    public function init()    {        if ($this->autoRelease) {//如果是自动释放锁            $locks = &$this->_locks;            //注册shutdown回调函数，在这里做锁的释放动作            register_shutdown_function(function () use (&$locks) {                foreach ($locks as $lock) {                    $this->release($lock);                }            });        }    }     /**     * Acquires a lock by name.     * @param string $name of the lock to be acquired. Must be unique.     * @param int $timeout time (in seconds) to wait for lock to be released. Defaults to zero meaning that method will return     * false immediately in case lock was already acquired.     * @return bool lock acquiring result.     */    public function acquire($name, $timeout = 0)//按名称获取锁    {        if ($this->acquireLock($name, $timeout)) {            $this->_locks[] = $name;             return true;        }         return false;    }     /**     * Releases acquired lock. This method will return false in case the lock was not found.     * @param string $name of the lock to be released. This lock must already exist.     * @return bool lock release result: false in case named lock was not found..     */    public function release($name)//按名称释放锁    {        if ($this->releaseLock($name)) {            $index = array_search($name, $this->_locks);            if ($index !== false) {                unset($this->_locks[$index]);            }             return true;        }         return false;    }     /**     * This method should be extended by a concrete Mutex implementations. Acquires lock by name.     * @param string $name of the lock to be acquired.     * @param int $timeout time (in seconds) to wait for the lock to be released.     * @return bool acquiring result.     */    abstract protected function acquireLock($name, $timeout = 0);//抽象函数，按名称获取锁     /**     * This method should be extended by a concrete Mutex implementations. Releases lock by given name.     * @param string $name of the lock to be released.     * @return bool release result.     */    abstract protected function releaseLock($name);//抽象函数，按名称释放锁}

其作为基础类，子类需要实现acquireLock和releaseLock方法，即具体的加锁和解锁策略。

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