man os_multitasking () - Indicates if the OS is multitasking. Allegro game programming library.
NAME
os_multitasking - Indicates if the OS is multitasking. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
extern int os_multitasking;
DESCRIPTION
Set by allegro_init() to either TRUE or FALSE depending on whether your Operating System is multitasking or not.