ThreadManager: Lazy-init during getInstance()

src/pocketmine/PocketMine.php

@@ -263,7 +263,6 @@ namespace pocketmine {
 
 			//TODO: move this to a Server field
 			define('pocketmine\START_TIME', microtime(true));
-			ThreadManager::init();
 
 			/*
 			 * We now use the Composer autoloader, but this autoloader is still for loading plugins.

src/pocketmine/ThreadManager.php

@@ -28,10 +28,11 @@ use function spl_object_hash;
 
 class ThreadManager extends \Volatile{
 
-	/** @var ThreadManager */
+	/** @var ThreadManager|null */
 	private static $instance = null;
 
 	/**
+	 * @deprecated
 	 * @return void
 	 */
 	public static function init(){
@@ -42,6 +43,9 @@ class ThreadManager extends \Volatile{
 	 * @return ThreadManager
 	 */
 	public static function getInstance(){
+		if(self::$instance === null){
+			self::$instance = new ThreadManager();
+		}
 		return self::$instance;
 	}