mirror of https://github.com/friendica/friendica
88 lines
1.7 KiB
PHP
88 lines
1.7 KiB
PHP
<?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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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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* @brief Creates a semaphore key
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*
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* @param string $key Name of the lock
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*
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* @return integer the semaphore key
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*/
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private static function semaphoreKey($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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*
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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 $timeout Seconds until we give up
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*
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* @return boolean Was the lock successful?
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*/
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public function acquireLock($key, $timeout = 120)
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{
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self::$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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* @brief Removes a lock if it was set by us
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*
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* @param string $key Name of the lock
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*
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* @return mixed
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*/
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public function releaseLock($key)
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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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* @brief Checks, if a key is currently locked to a process
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*
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* @param string $key The name of the lock
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* @return bool
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*/
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public function isLocked($key)
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{
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return @sem_get(self::$semaphore[$key]) !== false;
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}
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}
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