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Add SDL_mutex implementation using Windows Slim Reader/Writer Locks Keep Critical Section impl for Windows XP/Vista - choose at runtime

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v2: - Add SRW definitions as suggested by Ozkan Sezer
      Allows building against older platform headers.
    - Rename "hidden" function parameter `mutex_` to `_mutex`

v3: - Use GetModuleHandle instead of LoadLibrary
    - Fix typo in comment
This commit is contained in:
Joel Linn 2020-12-23 13:33:36 -08:00
parent 090fffac6a
commit 548cb90893
2 changed files with 259 additions and 19 deletions
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14
include/SDL_hints.h
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@ -1196,6 +1196,20 @@ extern "C" {
*/
#define SDL_HINT_WINDOWS_DISABLE_THREAD_NAMING "SDL_WINDOWS_DISABLE_THREAD_NAMING"
/**
* \brief Force SDL to use Critical Sections for mutexes on Windows.
* On Windows 7 and newer, Slim Reader/Writer Locks are available.
* They offer better performance, allocate no kernel ressources and
* use less memory. SDL will fall back to Critical Sections on older
* OS versions or if forced to by this hint.
*
* This variable can be set to the following values:
* "0" - Use SRW Locks when available. If not, fall back to Critical Sections. (default)
* "1" - Force the use of Critical Sections in all cases.
*
*/
#define SDL_HINT_WINDOWS_FORCE_MUTEX_CRITICAL_SECTIONS "SDL_WINDOWS_FORCE_MUTEX_CRITICAL_SECTIONS"
/**
* \brief Tell SDL which Dispmanx layer to use on a Raspberry PI
*