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Add SDL_sem implementation using Atomics and WaitOnAddress API.

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Keep Semaphore Kernel Object impl for Windows 7 and older - choose at runtime

v2: - Fix mixed int/LONG types
    - Reorder definitions
    - Add missing include

v3: - Use `GetModuleHandle()` to load the API Set
This commit is contained in:
Joel Linn 2020-12-23 13:36:46 -08:00
parent 2b040cebbe
commit d0b8295c0d
2 changed files with 339 additions and 23 deletions
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16
include/SDL_hints.h
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@ -1210,6 +1210,22 @@ extern "C" {
*/
#define SDL_HINT_WINDOWS_FORCE_MUTEX_CRITICAL_SECTIONS "SDL_WINDOWS_FORCE_MUTEX_CRITICAL_SECTIONS"
/**
* \brief Force SDL to use 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.
*
* This variable can be set to the following values:
* "0" - Use Atomics and WaitOnAddress API when available. If not, fall back to Kernel Objects. (default)
* "1" - Force the use of Kernel Objects in all cases.
*
*/
#define SDL_HINT_WINDOWS_FORCE_SEMAPHORE_KERNEL "SDL_WINDOWS_FORCE_SEMAPHORE_KERNEL"
/**
* \brief Tell SDL which Dispmanx layer to use on a Raspberry PI
*