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


Force SDL to use Kernel Semaphores on Windows.

Header File

Defined in 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.

This variable can be set to the following values:

CategoryAPI, CategoryAPIMacro, CategoryHints

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