Provided by: allegro4-doc_4.4.2-7_all 

NAME
lock_bitmap - Locks the memory used by a bitmap. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
void lock_bitmap(BITMAP *bitmap);
DESCRIPTION
Under DOS, locks all the memory used by a bitmap. You don't normally need to call this function unless
you are doing very weird things in your program.
Allegro version 4.4.2 lock_bitmap(3alleg4)