69 lines
1.4 KiB
PHP
69 lines
1.4 KiB
PHP
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<?php
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namespace Friendica\Core\Lock;
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class SemaphoreLockDriver extends AbstractLockDriver
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{
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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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* @brief Creates a semaphore key
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*
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* @param string $key Name of the lock
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*
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* @return integer the semaphore key
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*/
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private static function semaphoreKey(string $key): int
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{
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$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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*
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* @brief Sets a lock for a given name
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*
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* @param string $key The Name of the lock
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* @param integer $timeout Seconds until we give up
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*
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* @return boolean Was the lock successful?
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*/
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public function acquireLock(string $key, int $timeout = 120)
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{
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$this->acquiredLocks[$key] = sem_get(self::semaphoreKey($key));
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if ($this->acquiredLocks[$key]) {
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return sem_acquire($this->acquiredLocks[$key], ($timeout == 0));
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}
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}
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/**
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* @brief Removes a lock if it was set by us
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*
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* @param string $key Name of the lock
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*
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* @return mixed
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*/
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public function releaseLock(string $key)
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{
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if (empty($this->acquiredLocks[$key])) {
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return false;
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} else {
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$success = @sem_release($this->acquiredLocks[$key]);
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unset($this->acquiredLocks[$key]);
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return $success;
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}
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}
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}
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