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parallel/lib/Threading/Internal/Mutex.php
2016-11-14 17:43:44 -06:00

51 lines
1.0 KiB
PHP

<?php declare(strict_types = 1);
namespace Amp\Parallel\Threading\Internal;
use Amp\{ Coroutine, Pause };
use Amp\Parallel\Sync\Lock;
use Interop\Async\Promise;
/**
* @internal
*/
class Mutex extends \Threaded {
const LATENCY_TIMEOUT = 10;
/** @var bool */
private $lock = true;
/**
* @return \Interop\Async\Promise
*/
public function acquire(): Promise {
return new Coroutine($this->doAcquire());
}
/**
* Attempts to acquire the lock and sleeps for a time if the lock could not be acquired.
*
* @return \Generator
*/
public function doAcquire(): \Generator {
$tsl = function () {
return ($this->lock ? $this->lock = false : true);
};
while (!$this->lock || $this->synchronized($tsl)) {
yield new Pause(self::LATENCY_TIMEOUT);
}
return new Lock(function () {
$this->release();
});
}
/**
* Releases the lock.
*/
protected function release() {
$this->lock = true;
}
}