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Showing content from https://www.yiiframework.com/doc/api/2.0/yii-mutex-filemutex below:

FileMutex, yii\mutex\FileMutex | API Documentation for Yii 2.0

FileMutex implements mutex "lock" mechanism via local file system files.

This component relies on PHP flock() function.

Application configuration example:

[
    'components' => [
        'mutex' => [
            'class' => 'yii\mutex\FileMutex'
        ],
    ],
]

Note: this component can maintain the locks only for the single web server, it probably will not suffice in case you are using cloud server solution.

Warning: due to flock() function nature this component is unreliable when using a multithreaded server API like ISAPI.

See also __get().

Source code

                public function __set($name, $value)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        
        $this->$setter($value);
        return;
    } elseif (strncmp($name, 'on ', 3) === 0) {
        
        $this->on(trim(substr($name, 3)), $value);
        return;
    } elseif (strncmp($name, 'as ', 3) === 0) {
        
        $name = trim(substr($name, 3));
        if ($value instanceof Behavior) {
            $this->attachBehavior($name, $value);
        } elseif ($value instanceof \Closure) {
            $this->attachBehavior($name, call_user_func($value));
        } elseif (isset($value['__class']) && is_subclass_of($value['__class'], Behavior::class)) {
            $this->attachBehavior($name, Yii::createObject($value));
        } elseif (!isset($value['__class']) && isset($value['class']) && is_subclass_of($value['class'], Behavior::class)) {
            $this->attachBehavior($name, Yii::createObject($value));
        } elseif (is_string($value) && is_subclass_of($value, Behavior::class, true)) {
            $this->attachBehavior($name, Yii::createObject($value));
        } else {
            throw new InvalidConfigException('Class is not of type ' . Behavior::class . ' or its subclasses');
        }
        return;
    }
    
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canSetProperty($name)) {
            $behavior->$name = $value;
            return;
        }
    }
    if (method_exists($this, 'get' . $name)) {
        throw new InvalidCallException('Setting read-only property: ' . get_class($this) . '::' . $name);
    }
    throw new UnknownPropertyException('Setting unknown property: ' . get_class($this) . '::' . $name);
}

Defined in: yii\base\Component::__unset()

Sets a component property to be null.

This method will check in the following order and act accordingly:

a property defined by a setter: set the property value to be null
a property of a behavior: set the property value to be null

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing unset($component->property).

Source code

                public function __unset($name)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        $this->$setter(null);
        return;
    }
    
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canSetProperty($name)) {
            $behavior->$name = null;
            return;
        }
    }
    throw new InvalidCallException('Unsetting an unknown or read-only property: ' . get_class($this) . '::' . $name);
}

public boolean acquire ( $name, $timeout = 0 ) $name string

Of the lock to be acquired. Must be unique.

$timeout integer

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 boolean

Lock acquiring result.

Source code

                public function acquire($name, $timeout = 0)
{
    if (!in_array($name, $this->_locks, true) && $this->acquireLock($name, $timeout)) {
        $this->_locks[] = $name;
        return true;
    }
    return false;
}

Acquires lock by given name.

protected boolean acquireLock ( $name, $timeout = 0 ) $name string

Of the lock to be acquired.

$timeout integer

Time (in seconds) to wait for lock to become released.

return boolean

Acquiring result.

Source code

                protected function acquireLock($name, $timeout = 0)
{
    $filePath = $this->getLockFilePath($name);
    return $this->retryAcquire($timeout, function () use ($filePath, $name) {
        $file = fopen($filePath, 'w+');
        if ($file === false) {
            return false;
        }
        if ($this->fileMode !== null) {
            @chmod($filePath, $this->fileMode);
        }
        if (!flock($file, LOCK_EX | LOCK_NB)) {
            fclose($file);
            return false;
        }
        
        
        
        
        
        
        
        
        
        
        if (DIRECTORY_SEPARATOR !== '\\' && fstat($file)['ino'] !== @fileinode($filePath)) {
            clearstatcache(true, $filePath);
            flock($file, LOCK_UN);
            fclose($file);
            return false;
        }
        $this->_files[$name] = $file;
        return true;
    });
}

Source code

                public function attachBehavior($name, $behavior)
{
    $this->ensureBehaviors();
    return $this->attachBehaviorInternal($name, $behavior);
}

public void attachBehaviors ( $behaviors ) $behaviors array

List of behaviors to be attached to the component

Source code

                public function attachBehaviors($behaviors)
{
    $this->ensureBehaviors();
    foreach ($behaviors as $name => $behavior) {
        $this->attachBehaviorInternal($name, $behavior);
    }
}

Defined in: yii\base\Component::behaviors()

Returns a list of behaviors that this component should behave as.

Child classes may override this method to specify the behaviors they want to behave as.

The return value of this method should be an array of behavior objects or configurations indexed by behavior names. A behavior configuration can be either a string specifying the behavior class or an array of the following structure:

'behaviorName' => [
    'class' => 'BehaviorClass',
    'property1' => 'value1',
    'property2' => 'value2',
]

Note that a behavior class must extend from yii\base\Behavior. Behaviors can be attached using a name or anonymously. When a name is used as the array key, using this name, the behavior can later be retrieved using getBehavior() or be detached using detachBehavior(). Anonymous behaviors can not be retrieved or detached.

Behaviors declared in this method will be attached to the component automatically (on demand).

Source code

                public function behaviors()
{
    return [];
}

Defined in: yii\base\Component::canGetProperty()

Returns a value indicating whether a property can be read.

A property can be read if:

the class has a getter method associated with the specified name (in this case, property name is case-insensitive);
the class has a member variable with the specified name (when $checkVars is true);
an attached behavior has a readable property of the given name (when $checkBehaviors is true).