Man page - sdl_mustlock(3)

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Manual

SDL_MUSTLOCK(3) SDL3 FUNCTIONS SDL_MUSTLOCK(3)

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

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 3.2.10 Simple Directmedia Layer