73 lines
1.2 KiB
PHP
73 lines
1.2 KiB
PHP
<?php
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namespace Friendica\Core\Lock;
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use Friendica\Core\Cache;
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class SemaphoreLock extends Lock
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{
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private static $semaphore = [];
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public function __construct()
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{
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if (!function_exists('sem_get')) {
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throw new \Exception('Semaphore lock not supported');
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}
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}
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/**
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* (@inheritdoc)
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*/
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private static function semaphoreKey($key)
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{
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$temp = get_temppath();
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$file = $temp . '/' . $key . '.sem';
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if (!file_exists($file)) {
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file_put_contents($file, $key);
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}
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return ftok($file, 'f');
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}
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/**
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* (@inheritdoc)
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*/
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public function acquireLock($key, $timeout = 120, $ttl = Cache::FIVE_MINUTES)
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{
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self::$semaphore[$key] = sem_get(self::semaphoreKey($key));
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if (self::$semaphore[$key]) {
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if (sem_acquire(self::$semaphore[$key], ($timeout == 0))) {
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$this->markAcquire($key);
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return true;
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}
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}
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return false;
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}
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/**
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* (@inheritdoc)
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*/
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public function releaseLock($key, $override = false)
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{
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if (empty(self::$semaphore[$key])) {
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return false;
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} else {
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$success = @sem_release(self::$semaphore[$key]);
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unset(self::$semaphore[$key]);
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$this->markRelease($key);
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return $success;
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}
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}
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/**
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* (@inheritdoc)
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*/
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public function isLocked($key)
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{
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return isset(self::$semaphore[$key]);
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}
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}
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