Provided by: libsdl3-doc_3.2.4+ds-2_all 

NAME
SDL_MUSTLOCK - Evaluates to true if the surface needs to be locked before access.
HEADER FILE
Defined in SDL3/SDL_surface.h
SYNOPSIS
#include "SDL3/SDL.h" #define SDL_MUSTLOCK(S) (((S)->flags & SDL_SURFACE_LOCK_NEEDED) == SDL_SURFACE_LOCK_NEEDED)
AVAILABILITY
This macro is available since SDL 3.2.0.