(PECL pthreads >= 2.0.0) Collect references to completed tasks
(PECL pthreads >= 2.0.0) Shutdown all Workers
(PECL pthreads >= 2.0.0) Submits an object for execution
(PECL pthreads >= 2.0.0) Resize the Pool public
(PECL pthreads >= 2.0.0) Creates a new Pool of Workers