SDL_MUSTLOCK - Man Page

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

Header File

Defined in SDL3/SDL_surface.h

#include "SDL3/SDL.h"

#define SDL_MUSTLOCK(S) ((((S)->flags & SDL_SURFACE_LOCK_NEEDED)) == SDL_SURFACE_LOCK_NEEDED)

This macro is available since SDL 3.2.0.

SDL 3.2.2 Simple Directmedia Layer SDL3 FUNCTIONS