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 --- contrib/SDL-3.2.8/src/atomic/SDL_spinlock.c | 203 ---------------------------- 1 file changed, 203 deletions(-) delete mode 100644 contrib/SDL-3.2.8/src/atomic/SDL_spinlock.c (limited to 'contrib/SDL-3.2.8/src/atomic/SDL_spinlock.c') diff --git a/contrib/SDL-3.2.8/src/atomic/SDL_spinlock.c b/contrib/SDL-3.2.8/src/atomic/SDL_spinlock.c deleted file mode 100644 index 8e35c8a..0000000 --- a/contrib/SDL-3.2.8/src/atomic/SDL_spinlock.c +++ /dev/null @@ -1,203 +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" - -#if defined(SDL_PLATFORM_WINDOWS) -#include "../core/windows/SDL_windows.h" -#endif - -#if !defined(HAVE_GCC_ATOMICS) && defined(SDL_PLATFORM_SOLARIS) -#include -#endif - -#if !defined(HAVE_GCC_ATOMICS) && defined(SDL_PLATFORM_RISCOS) -#include -#endif - -#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64)) -#include -#endif - -#ifdef PS2 -#include -#endif - -#if !defined(HAVE_GCC_ATOMICS) && defined(SDL_PLATFORM_MACOS) -#include -#endif - -/* *INDENT-OFF* */ // clang-format off -#if defined(__WATCOMC__) && defined(__386__) -SDL_COMPILE_TIME_ASSERT(locksize, 4==sizeof(SDL_SpinLock)); -extern __inline int _SDL_xchg_watcom(volatile int *a, int v); -#pragma aux _SDL_xchg_watcom = \ - "lock xchg [ecx], eax" \ - parm [ecx] [eax] \ - value [eax] \ - modify exact [eax]; -#endif // __WATCOMC__ && __386__ -/* *INDENT-ON* */ // clang-format on - -// This function is where all the magic happens... -bool SDL_TryLockSpinlock(SDL_SpinLock *lock) -{ -#if defined(HAVE_GCC_ATOMICS) || defined(HAVE_GCC_SYNC_LOCK_TEST_AND_SET) - return __sync_lock_test_and_set(lock, 1) == 0; - -#elif defined(_MSC_VER) && (defined(_M_ARM) || defined(_M_ARM64)) - return _InterlockedExchange_acq(lock, 1) == 0; - -#elif defined(_MSC_VER) - SDL_COMPILE_TIME_ASSERT(locksize, sizeof(*lock) == sizeof(long)); - return InterlockedExchange((long *)lock, 1) == 0; - -#elif defined(__WATCOMC__) && defined(__386__) - return _SDL_xchg_watcom(lock, 1) == 0; - -#elif defined(__GNUC__) && defined(__arm__) && \ - (defined(__ARM_ARCH_3__) || defined(__ARM_ARCH_3M__) || \ - defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) || \ - defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5TE__) || \ - defined(__ARM_ARCH_5TEJ__)) - int result; - -#ifdef SDL_PLATFORM_RISCOS - if (__cpucap_have_rex()) { - __asm__ __volatile__( - "ldrex %0, [%2]\nteq %0, #0\nstrexeq %0, %1, [%2]" - : "=&r"(result) - : "r"(1), "r"(lock) - : "cc", "memory"); - return result == 0; - } -#endif - - __asm__ __volatile__( - "swp %0, %1, [%2]\n" - : "=&r,&r"(result) - : "r,0"(1), "r,r"(lock) - : "memory"); - return result == 0; - -#elif defined(__GNUC__) && defined(__arm__) - int result; - __asm__ __volatile__( - "ldrex %0, [%2]\nteq %0, #0\nstrexeq %0, %1, [%2]" - : "=&r"(result) - : "r"(1), "r"(lock) - : "cc", "memory"); - return result == 0; - -#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) - int result; - __asm__ __volatile__( - "lock ; xchgl %0, (%1)\n" - : "=r"(result) - : "r"(lock), "0"(1) - : "cc", "memory"); - return result == 0; - -#elif defined(SDL_PLATFORM_MACOS) || defined(SDL_PLATFORM_IOS) || defined(SDL_PLATFORM_TVOS) - // Maybe used for PowerPC, but the Intel asm or gcc atomics are favored. - return OSAtomicCompareAndSwap32Barrier(0, 1, lock); - -#elif defined(SDL_PLATFORM_SOLARIS) && defined(_LP64) - // Used for Solaris with non-gcc compilers. - return ((int)atomic_cas_64((volatile uint64_t *)lock, 0, 1) == 0); - -#elif defined(SDL_PLATFORM_SOLARIS) && !defined(_LP64) - // Used for Solaris with non-gcc compilers. - return ((int)atomic_cas_32((volatile uint32_t *)lock, 0, 1) == 0); -#elif defined(PS2) - uint32_t oldintr; - bool res = false; - // disable interruption - oldintr = DIntr(); - - if (*lock == 0) { - *lock = 1; - res = true; - } - // enable interruption - if (oldintr) { - EIntr(); - } - return res; -#else - // Terrible terrible damage - static SDL_Mutex *_spinlock_mutex; - - if (!_spinlock_mutex) { - // Race condition on first lock... - _spinlock_mutex = SDL_CreateMutex(); - } - SDL_LockMutex(_spinlock_mutex); - if (*lock == 0) { - *lock = 1; - SDL_UnlockMutex(_spinlock_mutex); - return true; - } else { - SDL_UnlockMutex(_spinlock_mutex); - return false; - } -#endif -} - -void SDL_LockSpinlock(SDL_SpinLock *lock) -{ - int iterations = 0; - // FIXME: Should we have an eventual timeout? - while (!SDL_TryLockSpinlock(lock)) { - if (iterations < 32) { - iterations++; - SDL_CPUPauseInstruction(); - } else { - // !!! FIXME: this doesn't definitely give up the current timeslice, it does different things on various platforms. - SDL_Delay(0); - } - } -} - -void SDL_UnlockSpinlock(SDL_SpinLock *lock) -{ -#if defined(HAVE_GCC_ATOMICS) || defined(HAVE_GCC_SYNC_LOCK_TEST_AND_SET) - __sync_lock_release(lock); - -#elif defined(_MSC_VER) && (defined(_M_ARM) || defined(_M_ARM64)) - _InterlockedExchange_rel(lock, 0); - -#elif defined(_MSC_VER) - _ReadWriteBarrier(); - *lock = 0; - -#elif defined(__WATCOMC__) && defined(__386__) - SDL_CompilerBarrier(); - *lock = 0; - -#elif defined(SDL_PLATFORM_SOLARIS) - // Used for Solaris when not using gcc. - *lock = 0; - membar_producer(); - -#else - *lock = 0; -#endif -} -- cgit v1.2.3