From 30f41c02aec763d32e62351452da9ef582bc3472 Mon Sep 17 00:00:00 2001 From: 3gg <3gg@shellblade.net> Date: Fri, 6 Mar 2026 13:30:59 -0800 Subject: Move contrib libraries to contrib repo --- .../SDL-3.2.8/src/thread/windows/SDL_sysmutex.c | 238 --------------------- 1 file changed, 238 deletions(-) delete mode 100644 contrib/SDL-3.2.8/src/thread/windows/SDL_sysmutex.c (limited to 'contrib/SDL-3.2.8/src/thread/windows/SDL_sysmutex.c') diff --git a/contrib/SDL-3.2.8/src/thread/windows/SDL_sysmutex.c b/contrib/SDL-3.2.8/src/thread/windows/SDL_sysmutex.c deleted file mode 100644 index 88ec004..0000000 --- a/contrib/SDL-3.2.8/src/thread/windows/SDL_sysmutex.c +++ /dev/null @@ -1,238 +0,0 @@ -/* - Simple DirectMedia Layer - Copyright (C) 1997-2025 Sam Lantinga - - This software is provided 'as-is', without any express or implied - warranty. In no event will the authors be held liable for any damages - arising from the use of this software. - - Permission is granted to anyone to use this software for any purpose, - including commercial applications, and to alter it and redistribute it - freely, subject to the following restrictions: - - 1. The origin of this software must not be misrepresented; you must not - claim that you wrote the original software. If you use this software - in a product, an acknowledgment in the product documentation would be - appreciated but is not required. - 2. Altered source versions must be plainly marked as such, and must not be - misrepresented as being the original software. - 3. This notice may not be removed or altered from any source distribution. -*/ -#include "SDL_internal.h" - -#ifdef SDL_THREAD_WINDOWS - -/** - * Mutex functions using the Win32 API - * There are two implementations available based on: - * - Critical Sections. Available on all OS versions since Windows XP. - * - Slim Reader/Writer Locks. Requires Windows 7 or newer. - * which are chosen at runtime. - */ - -#include "SDL_sysmutex_c.h" - -// Implementation will be chosen at runtime based on available Kernel features -SDL_mutex_impl_t SDL_mutex_impl_active = { 0 }; - -/** - * Implementation based on Slim Reader/Writer (SRW) Locks for Win 7 and newer. - */ - -typedef VOID(WINAPI *pfnInitializeSRWLock)(PSRWLOCK); -typedef VOID(WINAPI *pfnReleaseSRWLockExclusive)(PSRWLOCK); -typedef VOID(WINAPI *pfnAcquireSRWLockExclusive)(PSRWLOCK); -typedef BOOLEAN(WINAPI *pfnTryAcquireSRWLockExclusive)(PSRWLOCK); -static pfnInitializeSRWLock pInitializeSRWLock = NULL; -static pfnReleaseSRWLockExclusive pReleaseSRWLockExclusive = NULL; -static pfnAcquireSRWLockExclusive pAcquireSRWLockExclusive = NULL; -static pfnTryAcquireSRWLockExclusive pTryAcquireSRWLockExclusive = NULL; - -static SDL_Mutex *SDL_CreateMutex_srw(void) -{ - SDL_mutex_srw *mutex = (SDL_mutex_srw *)SDL_calloc(1, sizeof(*mutex)); - if (mutex) { - pInitializeSRWLock(&mutex->srw); - } - return (SDL_Mutex *)mutex; -} - -static void SDL_DestroyMutex_srw(SDL_Mutex *mutex) -{ - // There are no kernel allocated resources - SDL_free(mutex); -} - -static void SDL_LockMutex_srw(SDL_Mutex *_mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes -{ - SDL_mutex_srw *mutex = (SDL_mutex_srw *)_mutex; - const DWORD this_thread = GetCurrentThreadId(); - - if (mutex->owner == this_thread) { - ++mutex->count; - } else { - /* The order of operations is important. - We set the locking thread id after we obtain the lock - so unlocks from other threads will fail. - */ - pAcquireSRWLockExclusive(&mutex->srw); - SDL_assert(mutex->count == 0 && mutex->owner == 0); - mutex->owner = this_thread; - mutex->count = 1; - } -} - -static bool SDL_TryLockMutex_srw(SDL_Mutex *_mutex) -{ - SDL_mutex_srw *mutex = (SDL_mutex_srw *)_mutex; - const DWORD this_thread = GetCurrentThreadId(); - bool retval = true; - - if (mutex->owner == this_thread) { - ++mutex->count; - } else { - if (pTryAcquireSRWLockExclusive(&mutex->srw) != 0) { - SDL_assert(mutex->count == 0 && mutex->owner == 0); - mutex->owner = this_thread; - mutex->count = 1; - } else { - retval = false; - } - } - return retval; -} - -static void SDL_UnlockMutex_srw(SDL_Mutex *_mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes -{ - SDL_mutex_srw *mutex = (SDL_mutex_srw *)_mutex; - - if (mutex->owner == GetCurrentThreadId()) { - if (--mutex->count == 0) { - mutex->owner = 0; - pReleaseSRWLockExclusive(&mutex->srw); - } - } else { - SDL_assert(!"mutex not owned by this thread"); // undefined behavior...! - } -} - -static const SDL_mutex_impl_t SDL_mutex_impl_srw = { - &SDL_CreateMutex_srw, - &SDL_DestroyMutex_srw, - &SDL_LockMutex_srw, - &SDL_TryLockMutex_srw, - &SDL_UnlockMutex_srw, - SDL_MUTEX_SRW, -}; - -/** - * Fallback Mutex implementation using Critical Sections (before Win 7) - */ - -static SDL_Mutex *SDL_CreateMutex_cs(void) -{ - SDL_mutex_cs *mutex = (SDL_mutex_cs *)SDL_malloc(sizeof(*mutex)); - if (mutex) { - // Initialize - // On SMP systems, a non-zero spin count generally helps performance - // This function always succeeds - (void)InitializeCriticalSectionAndSpinCount(&mutex->cs, 2000); - } - return (SDL_Mutex *)mutex; -} - -static void SDL_DestroyMutex_cs(SDL_Mutex *mutex_) -{ - SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_; - DeleteCriticalSection(&mutex->cs); - SDL_free(mutex); -} - -static void SDL_LockMutex_cs(SDL_Mutex *mutex_) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes -{ - SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_; - EnterCriticalSection(&mutex->cs); -} - -static bool SDL_TryLockMutex_cs(SDL_Mutex *mutex_) -{ - SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_; - return (TryEnterCriticalSection(&mutex->cs) == TRUE); -} - -static void SDL_UnlockMutex_cs(SDL_Mutex *mutex_) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes -{ - SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_; - LeaveCriticalSection(&mutex->cs); -} - -static const SDL_mutex_impl_t SDL_mutex_impl_cs = { - &SDL_CreateMutex_cs, - &SDL_DestroyMutex_cs, - &SDL_LockMutex_cs, - &SDL_TryLockMutex_cs, - &SDL_UnlockMutex_cs, - SDL_MUTEX_CS, -}; - -/** - * Runtime selection and redirection - */ - -SDL_Mutex *SDL_CreateMutex(void) -{ - if (!SDL_mutex_impl_active.Create) { - const SDL_mutex_impl_t *impl = &SDL_mutex_impl_cs; - - // Try faster implementation for Windows 7 and newer - HMODULE kernel32 = GetModuleHandle(TEXT("kernel32.dll")); - if (kernel32) { - // Requires Vista: - pInitializeSRWLock = (pfnInitializeSRWLock)GetProcAddress(kernel32, "InitializeSRWLock"); - pReleaseSRWLockExclusive = (pfnReleaseSRWLockExclusive)GetProcAddress(kernel32, "ReleaseSRWLockExclusive"); - pAcquireSRWLockExclusive = (pfnAcquireSRWLockExclusive)GetProcAddress(kernel32, "AcquireSRWLockExclusive"); - // Requires 7: - pTryAcquireSRWLockExclusive = (pfnTryAcquireSRWLockExclusive)GetProcAddress(kernel32, "TryAcquireSRWLockExclusive"); - if (pInitializeSRWLock && pReleaseSRWLockExclusive && pAcquireSRWLockExclusive && pTryAcquireSRWLockExclusive) { - impl = &SDL_mutex_impl_srw; - } - } - - // Copy instead of using pointer to save one level of indirection - SDL_copyp(&SDL_mutex_impl_active, impl); - } - return SDL_mutex_impl_active.Create(); -} - -void SDL_DestroyMutex(SDL_Mutex *mutex) -{ - if (mutex) { - SDL_mutex_impl_active.Destroy(mutex); - } -} - -void SDL_LockMutex(SDL_Mutex *mutex) -{ - if (mutex) { - SDL_mutex_impl_active.Lock(mutex); - } -} - -bool SDL_TryLockMutex(SDL_Mutex *mutex) -{ - bool result = true; - - if (mutex) { - result = SDL_mutex_impl_active.TryLock(mutex); - } - return result; -} - -void SDL_UnlockMutex(SDL_Mutex *mutex) -{ - if (mutex) { - SDL_mutex_impl_active.Unlock(mutex); - } -} - -#endif // SDL_THREAD_WINDOWS -- cgit v1.2.3