(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)

SDL_MUSTLOCK

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

Header File

Defined in [SDL_surface.h](https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_surface.h), but apps should _only_ `#include "SDL.h"`!

Syntax

#define SDL_MUSTLOCK(S) (((S)->flags & SDL_RLEACCEL) != 0)

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CategoryAPI, CategoryAPIMacro, CategorySurface

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