(This is the documentation for SDL3, which is the current stable version. SDL2 was the previous version!)

SDL_HINT_WINDOWS_FORCE_SEMAPHORE_KERNEL

A variable controlling whether SDL uses Kernel Semaphores on Windows.

Header File

Defined in <SDL3/SDL_hints.h>

Syntax

#define SDL_HINT_WINDOWS_FORCE_SEMAPHORE_KERNEL "SDL_WINDOWS_FORCE_SEMAPHORE_KERNEL"

Remarks

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:

• "0": Use Atomics and WaitOnAddress API when available, otherwise fall back to Kernel Objects. (default)
• "1": Force the use of Kernel Objects in all cases.

This hint should be set before SDL is initialized.

Version

This hint is available since SDL 3.1.3.

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CategoryAPI, CategoryAPIMacro, CategoryHints

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