Rename *CacheDriver to *Cache because they don't act as driver anymore

src/Core/Lock/SemaphoreLock.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace Friendica\Core\Lock;
+
+use Friendica\Core\Cache;
+
+class SemaphoreLock extends AbstractLock
+{
+	private static $semaphore = [];
+
+	public function __construct()
+	{
+		if (!function_exists('sem_get')) {
+			throw new \Exception('Semaphore lock not supported');
+		}
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	private static function semaphoreKey($key)
+	{
+		$temp = get_temppath();
+
+		$file = $temp . '/' . $key . '.sem';
+
+		if (!file_exists($file)) {
+			file_put_contents($file, $key);
+		}
+
+		return ftok($file, 'f');
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function acquireLock($key, $timeout = 120, $ttl = Cache::FIVE_MINUTES)
+	{
+		self::$semaphore[$key] = sem_get(self::semaphoreKey($key));
+		if (self::$semaphore[$key]) {
+			if (sem_acquire(self::$semaphore[$key], ($timeout == 0))) {
+				$this->markAcquire($key);
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function releaseLock($key, $override = false)
+	{
+		if (empty(self::$semaphore[$key])) {
+			return false;
+		} else {
+			$success = @sem_release(self::$semaphore[$key]);
+			unset(self::$semaphore[$key]);
+			$this->markRelease($key);
+			return $success;
+		}
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function isLocked($key)
+	{
+		return isset(self::$semaphore[$key]);
+	}
+}