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/generic/SDL_sysrwlock.c | 194 --------------------- 1 file changed, 194 deletions(-) delete mode 100644 contrib/SDL-3.2.8/src/thread/generic/SDL_sysrwlock.c (limited to 'contrib/SDL-3.2.8/src/thread/generic/SDL_sysrwlock.c') diff --git a/contrib/SDL-3.2.8/src/thread/generic/SDL_sysrwlock.c b/contrib/SDL-3.2.8/src/thread/generic/SDL_sysrwlock.c deleted file mode 100644 index 24caf51..0000000 --- a/contrib/SDL-3.2.8/src/thread/generic/SDL_sysrwlock.c +++ /dev/null @@ -1,194 +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" - -// An implementation of rwlocks using mutexes, condition variables, and atomics. - -#include "SDL_systhread_c.h" - -#include "../generic/SDL_sysrwlock_c.h" - -/* If two implementations are to be compiled into SDL (the active one - * will be chosen at runtime), the function names need to be - * suffixed - */ -// !!! FIXME: this is quite a tapdance with macros and the build system, maybe we can simplify how we do this. --ryan. -#ifndef SDL_THREAD_GENERIC_RWLOCK_SUFFIX -#define SDL_CreateRWLock_generic SDL_CreateRWLock -#define SDL_DestroyRWLock_generic SDL_DestroyRWLock -#define SDL_LockRWLockForReading_generic SDL_LockRWLockForReading -#define SDL_LockRWLockForWriting_generic SDL_LockRWLockForWriting -#define SDL_UnlockRWLock_generic SDL_UnlockRWLock -#endif - -struct SDL_RWLock -{ -#ifdef SDL_THREADS_DISABLED - int unused; -#else - SDL_Mutex *lock; - SDL_Condition *condition; - SDL_ThreadID writer_thread; - SDL_AtomicInt reader_count; - SDL_AtomicInt writer_count; -#endif -}; - -SDL_RWLock *SDL_CreateRWLock_generic(void) -{ - SDL_RWLock *rwlock = (SDL_RWLock *) SDL_calloc(1, sizeof (*rwlock)); - - if (!rwlock) { - return NULL; - } - -#ifndef SDL_THREADS_DISABLED - rwlock->lock = SDL_CreateMutex(); - if (!rwlock->lock) { - SDL_free(rwlock); - return NULL; - } - - rwlock->condition = SDL_CreateCondition(); - if (!rwlock->condition) { - SDL_DestroyMutex(rwlock->lock); - SDL_free(rwlock); - return NULL; - } - - SDL_SetAtomicInt(&rwlock->reader_count, 0); - SDL_SetAtomicInt(&rwlock->writer_count, 0); -#endif - - return rwlock; -} - -void SDL_DestroyRWLock_generic(SDL_RWLock *rwlock) -{ - if (rwlock) { -#ifndef SDL_THREADS_DISABLED - SDL_DestroyMutex(rwlock->lock); - SDL_DestroyCondition(rwlock->condition); -#endif - SDL_free(rwlock); - } -} - -void SDL_LockRWLockForReading_generic(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes -{ -#ifndef SDL_THREADS_DISABLED - if (rwlock) { - // !!! FIXME: these don't have to be atomic, we always gate them behind a mutex. - SDL_LockMutex(rwlock->lock); - SDL_assert(SDL_GetAtomicInt(&rwlock->writer_count) == 0); // shouldn't be able to grab lock if there's a writer! - SDL_AddAtomicInt(&rwlock->reader_count, 1); - SDL_UnlockMutex(rwlock->lock); // other readers can attempt to share the lock. - } -#endif -} - -void SDL_LockRWLockForWriting_generic(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes -{ -#ifndef SDL_THREADS_DISABLED - if (rwlock) { - SDL_LockMutex(rwlock->lock); - while (SDL_GetAtomicInt(&rwlock->reader_count) > 0) { // while something is holding the shared lock, keep waiting. - SDL_WaitCondition(rwlock->condition, rwlock->lock); // release the lock and wait for readers holding the shared lock to release it, regrab the lock. - } - - // we hold the lock! - SDL_AddAtomicInt(&rwlock->writer_count, 1); // we let these be recursive, but the API doesn't require this. It _does_ trust you unlock correctly! - } -#endif -} - -bool SDL_TryLockRWLockForReading_generic(SDL_RWLock *rwlock) -{ -#ifndef SDL_THREADS_DISABLED - if (rwlock) { - if (!SDL_TryLockMutex(rwlock->lock)) { - // !!! FIXME: there is a small window where a reader has to lock the mutex, and if we hit that, we will return SDL_RWLOCK_TIMEDOUT even though we could have shared the lock. - return false; - } - - SDL_assert(SDL_GetAtomicInt(&rwlock->writer_count) == 0); // shouldn't be able to grab lock if there's a writer! - SDL_AddAtomicInt(&rwlock->reader_count, 1); - SDL_UnlockMutex(rwlock->lock); // other readers can attempt to share the lock. - } -#endif - - return true; -} - -#ifndef SDL_THREAD_GENERIC_RWLOCK_SUFFIX -bool SDL_TryLockRWLockForReading(SDL_RWLock *rwlock) -{ - return SDL_TryLockRWLockForReading_generic(rwlock); -} -#endif - -bool SDL_TryLockRWLockForWriting_generic(SDL_RWLock *rwlock) -{ -#ifndef SDL_THREADS_DISABLED - if (rwlock) { - if (!SDL_TryLockMutex(rwlock->lock)) { - return false; - } - - if (SDL_GetAtomicInt(&rwlock->reader_count) > 0) { // a reader is using the shared lock, treat it as unavailable. - SDL_UnlockMutex(rwlock->lock); - return false; - } - - // we hold the lock! - SDL_AddAtomicInt(&rwlock->writer_count, 1); // we let these be recursive, but the API doesn't require this. It _does_ trust you unlock correctly! - } -#endif - - return true; -} - -#ifndef SDL_THREAD_GENERIC_RWLOCK_SUFFIX -bool SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock) -{ - return SDL_TryLockRWLockForWriting_generic(rwlock); -} -#endif - -void SDL_UnlockRWLock_generic(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes -{ -#ifndef SDL_THREADS_DISABLED - if (rwlock) { - SDL_LockMutex(rwlock->lock); // recursive lock for writers, readers grab lock to make sure things are sane. - - if (SDL_GetAtomicInt(&rwlock->reader_count) > 0) { // we're a reader - SDL_AddAtomicInt(&rwlock->reader_count, -1); - SDL_BroadcastCondition(rwlock->condition); // alert any pending writers to attempt to try to grab the lock again. - } else if (SDL_GetAtomicInt(&rwlock->writer_count) > 0) { // we're a writer - SDL_AddAtomicInt(&rwlock->writer_count, -1); - SDL_UnlockMutex(rwlock->lock); // recursive unlock. - } - - SDL_UnlockMutex(rwlock->lock); - } -#endif -} - -- cgit v1.2.3