al_run_detached_thread - Allegro 5 API

       Runs  the passed function in its own thread, with arg passed to it as only parameter.  This is similar to
       calling  al_create_thread(3alleg5),  al_start_thread(3alleg5)  and  (after  the  thread   has   finished)
       al_destroy_thread(3alleg5)  -  but you don’t have the possibility of ever calling al_join_thread(3alleg5)
       on the thread.

Allegro reference manual                                                         al_run_detached_thread(3alleg5)

       al_run_detached_thread - Allegro 5 API

              #include <allegro5/allegro.h>

              void al_run_detached_thread(void *(*proc)(void *arg), void *arg)