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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。
相关推荐：yii教程
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：
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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