SDL_MUSTLOCK - Evaluates to true if the surface needs to be locked before access.

       This macro is available since SDL 3.2.0.

Simple Directmedia Layer                           SDL 3.2.20                                    SDL_MUSTLOCK(3)

       SDL_MUSTLOCK - Evaluates to true if the surface needs to be locked before access.

#include<SDL3/SDL_surface.h>#defineSDL_MUSTLOCK(S)(((S)->flags&SDL_SURFACE_LOCK_NEEDED)==SDL_SURFACE_LOCK_NEEDED)