mirror of
https://github.com/danog/parallel.git
synced 2024-12-13 09:37:26 +01:00
51 lines
1.0 KiB
PHP
51 lines
1.0 KiB
PHP
<?php declare(strict_types = 1);
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namespace Amp\Parallel\Threading\Internal;
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use Amp\{ Coroutine, Pause };
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use Amp\Parallel\Sync\Lock;
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use Interop\Async\Promise;
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/**
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* @internal
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*/
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class Mutex extends \Threaded {
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const LATENCY_TIMEOUT = 10;
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/** @var bool */
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private $lock = true;
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/**
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* @return \Interop\Async\Promise
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*/
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public function acquire(): Promise {
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return new Coroutine($this->doAcquire());
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}
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/**
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* Attempts to acquire the lock and sleeps for a time if the lock could not be acquired.
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*
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* @return \Generator
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*/
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public function doAcquire(): \Generator {
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$tsl = function () {
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return ($this->lock ? $this->lock = false : true);
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};
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while (!$this->lock || $this->synchronized($tsl)) {
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yield new Pause(self::LATENCY_TIMEOUT);
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}
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return new Lock(function () {
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$this->release();
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});
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}
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/**
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* Releases the lock.
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*/
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protected function release() {
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$this->lock = true;
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}
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}
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