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(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


A variable controlling whether SDL uses Kernel Semaphores on Windows.

Header File

Defined in <SDL3/SDL_hints.h>




Kernel Semaphores are inter-process and require a context switch on every interaction. On Windows 8 and newer, the WaitOnAddress API is available. Using that and atomics to implement semaphores increases performance. SDL will fall back to Kernel Objects on older OS versions or if forced to by this hint.

The variable can be set to the following values:

This hint should be set before SDL is initialized.


This hint is available since SDL 3.0.0.

CategoryAPI, CategoryAPIMacro, CategoryHints

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