devela::_dep::sdl3::sys::hints

Constant SDL_HINT_WINDOWS_FORCE_SEMAPHORE_KERNEL

pub const SDL_HINT_WINDOWS_FORCE_SEMAPHORE_KERNEL: *const i8 = _; // {alloc40147<imm>: *const i8}
Available on crate feature dep_sdl3 only.
Expand description

A variable controlling whether SDL uses Kernel Semaphores on Windows.

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.

§Availability

This hint is available since SDL 3.2.0.