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<?php
/* zLibrary
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
class Semaphore
{
/**
* @param int $semaphoreID
* @return null|resource
public static function fetch($semaphoreID)
global $useSemaphores, $semaphoreModulus;
if (!isset($useSemaphores)) $useSemaphores = false;
if ($useSemaphores == false) return null;
===
When comparing two booleans, it is generally considered safer to use the strict comparison operator.
if (!isset($semaphoreModulus)) $semaphoreModulus = 10;
$sem = sem_get($semaphoreID % $semaphoreModulus);
if (!sem_acquire($sem)) return null;
return $sem;
}
* @param null|resource $semaphoreResource
public static function release($semaphoreResource)
if ($semaphoreResource != null) sem_release($semaphoreResource);