al_start_thread - Allegro 5 API

       When  a  thread  is created, it is initially in a suspended state.  Calling al_start_thread(3alleg5) will
       start its actual execution.

       Starting a thread which has already been started does nothing.

       al_start_thread - Allegro 5 API

al_create_thread(3alleg5).

Allegro reference manual                                                                al_start_thread(3alleg5)

              #include <allegro5/allegro.h>

              void al_start_thread(ALLEGRO_THREAD *thread)