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<?php
namespace Amp\Sync;
/**
* A handle on an acquired lock from a synchronization object.
*
* This object is not thread-safe; after acquiring a lock from a mutex or
* semaphore, the lock should reside in the same thread or process until it is
* released.
*/
class Lock
{
/** @var callable|null The function to be called on release or null if the lock has been released. */
private $releaser;
/** @var int */
private $id;
/**
* Creates a new lock permit object.
*
* @param int $id The lock identifier.
* @param callable(self): void $releaser A function to be called upon release.
*/
public function __construct(int $id, callable $releaser)
{
$this->id = $id;
$this->releaser = $releaser;
}
/**
* Checks if the lock has already been released.
*
* @return bool True if the lock has already been released, otherwise false.
*/
public function isReleased(): bool
{
return !$this->releaser;
}
/**
* @return int Lock identifier.
*/
public function getId(): int
{
return $this->id;
}
/**
* Releases the lock. No-op if the lock has already been released.
*/
public function release()
{
if (!$this->releaser) {
return;
}
// Invoke the releaser function given to us by the synchronization source
// to release the lock.
$releaser = $this->releaser;
$this->releaser = null;
$releaser($this);
}
/**
* Releases the lock when there are no more references to it.
*/
public function __destruct()
{
if (!$this->isReleased()) {
$this->release();
}
}
}
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