framework/mutex/Mutex.php
public function init()
    {
        if ($this->autoRelease) {
            $locks = &$this->_locks;
            register_shutdown_function(function () use (&$locks) {
                foreach ($locks as $lock) {
                    $this->release($lock);
                }
            });
        }
    }
public function init()
    {
        if ($this->autoRelease) {
            $locks = &$this->_locks;
            register_shutdown_function(function () use (&$locks) {
                foreach ($locks as $lock) {
                    $this->release($lock);
                }
            });
        }
    }
Initializes the Mutex component.