From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001 From: 3gg <3gg@shellblade.net> Date: Sat, 27 Dec 2025 12:03:39 -0800 Subject: Initial commit --- .../SDL-3.2.8/src/thread/pthread/SDL_sysmutex.c | 154 +++++++++++++++++++++ 1 file changed, 154 insertions(+) create mode 100644 contrib/SDL-3.2.8/src/thread/pthread/SDL_sysmutex.c (limited to 'contrib/SDL-3.2.8/src/thread/pthread/SDL_sysmutex.c') diff --git a/contrib/SDL-3.2.8/src/thread/pthread/SDL_sysmutex.c b/contrib/SDL-3.2.8/src/thread/pthread/SDL_sysmutex.c new file mode 100644 index 0000000..7bba286 --- /dev/null +++ b/contrib/SDL-3.2.8/src/thread/pthread/SDL_sysmutex.c @@ -0,0 +1,154 @@ +/* + 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" + +#include +#include + +#include "SDL_sysmutex_c.h" + +SDL_Mutex *SDL_CreateMutex(void) +{ + SDL_Mutex *mutex; + pthread_mutexattr_t attr; + + // Allocate the structure + mutex = (SDL_Mutex *)SDL_calloc(1, sizeof(*mutex)); + if (mutex) { + pthread_mutexattr_init(&attr); +#ifdef SDL_THREAD_PTHREAD_RECURSIVE_MUTEX + pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); +#elif defined(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP) + pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP); +#else + // No extra attributes necessary +#endif + if (pthread_mutex_init(&mutex->id, &attr) != 0) { + SDL_SetError("pthread_mutex_init() failed"); + SDL_free(mutex); + mutex = NULL; + } + } + return mutex; +} + +void SDL_DestroyMutex(SDL_Mutex *mutex) +{ + if (mutex) { + pthread_mutex_destroy(&mutex->id); + SDL_free(mutex); + } +} + +void SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes +{ + if (mutex) { +#ifdef FAKE_RECURSIVE_MUTEX + pthread_t this_thread = pthread_self(); + if (mutex->owner == this_thread) { + ++mutex->recursive; + } 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. + */ + const int rc = pthread_mutex_lock(&mutex->id); + SDL_assert(rc == 0); // assume we're in a lot of trouble if this assert fails. + mutex->owner = this_thread; + mutex->recursive = 0; + } +#else + const int rc = pthread_mutex_lock(&mutex->id); + SDL_assert(rc == 0); // assume we're in a lot of trouble if this assert fails. +#endif + } +} + +bool SDL_TryLockMutex(SDL_Mutex *mutex) +{ + bool result = true; + + if (mutex) { +#ifdef FAKE_RECURSIVE_MUTEX + pthread_t this_thread = pthread_self(); + if (mutex->owner == this_thread) { + ++mutex->recursive; + } 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. + */ + const int rc = pthread_mutex_trylock(&mutex->id); + if (rc == 0) { + mutex->owner = this_thread; + mutex->recursive = 0; + } else if (rc == EBUSY) { + result = false; + } else { + SDL_assert(!"Error trying to lock mutex"); // assume we're in a lot of trouble if this assert fails. + result = false; + } + } +#else + const int rc = pthread_mutex_trylock(&mutex->id); + if (rc != 0) { + if (rc == EBUSY) { + result = false; + } else { + SDL_assert(!"Error trying to lock mutex"); // assume we're in a lot of trouble if this assert fails. + result = false; + } + } +#endif + } + + return result; +} + +void SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes +{ + if (mutex) { +#ifdef FAKE_RECURSIVE_MUTEX + // We can only unlock the mutex if we own it + if (pthread_self() == mutex->owner) { + if (mutex->recursive) { + --mutex->recursive; + } else { + /* The order of operations is important. + First reset the owner so another thread doesn't lock + the mutex and set the ownership before we reset it, + then release the lock semaphore. + */ + mutex->owner = 0; + pthread_mutex_unlock(&mutex->id); + } + } else { + SDL_SetError("mutex not owned by this thread"); + return; + } + +#else + const int rc = pthread_mutex_unlock(&mutex->id); + SDL_assert(rc == 0); // assume we're in a lot of trouble if this assert fails. +#endif // FAKE_RECURSIVE_MUTEX + } +} + -- cgit v1.2.3