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。
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下面我们看看其源码实现：
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 * @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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