diff options
Diffstat (limited to '3rdparty/SDL2/src/atomic/SDL_spinlock.c')
-rw-r--r-- | 3rdparty/SDL2/src/atomic/SDL_spinlock.c | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/3rdparty/SDL2/src/atomic/SDL_spinlock.c b/3rdparty/SDL2/src/atomic/SDL_spinlock.c deleted file mode 100644 index f582afb4e2c..00000000000 --- a/3rdparty/SDL2/src/atomic/SDL_spinlock.c +++ /dev/null @@ -1,135 +0,0 @@ -/* - Simple DirectMedia Layer - Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org> - - 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(__WIN32__) || defined(__WINRT__) -#include "../core/windows/SDL_windows.h" -#endif - -#include "SDL_atomic.h" -#include "SDL_mutex.h" -#include "SDL_timer.h" - -#if !defined(HAVE_GCC_ATOMICS) && defined(__SOLARIS__) -#include <atomic.h> -#endif - -/* This function is where all the magic happens... */ -SDL_bool -SDL_AtomicTryLock(SDL_SpinLock *lock) -{ -#if SDL_ATOMIC_DISABLED - /* 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 SDL_TRUE; - } else { - SDL_UnlockMutex(_spinlock_mutex); - return SDL_FALSE; - } - -#elif defined(_MSC_VER) - SDL_COMPILE_TIME_ASSERT(locksize, sizeof(*lock) == sizeof(long)); - return (InterlockedExchange((long*)lock, 1) == 0); - -#elif HAVE_GCC_ATOMICS || HAVE_GCC_SYNC_LOCK_TEST_AND_SET - return (__sync_lock_test_and_set(lock, 1) == 0); - -#elif defined(__GNUC__) && defined(__arm__) && \ - (defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) || \ - defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5TE__) || \ - defined(__ARM_ARCH_5TEJ__)) - int result; - __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(__MACOSX__) || defined(__IPHONEOS__) - /* Maybe used for PowerPC, but the Intel asm or gcc atomics are favored. */ - return OSAtomicCompareAndSwap32Barrier(0, 1, lock); - -#elif defined(__SOLARIS__) && defined(_LP64) - /* Used for Solaris with non-gcc compilers. */ - return (SDL_bool) ((int) atomic_cas_64((volatile uint64_t*)lock, 0, 1) == 0); - -#elif defined(__SOLARIS__) && !defined(_LP64) - /* Used for Solaris with non-gcc compilers. */ - return (SDL_bool) ((int) atomic_cas_32((volatile uint32_t*)lock, 0, 1) == 0); - -#else -#error Please implement for your platform. - return SDL_FALSE; -#endif -} - -void -SDL_AtomicLock(SDL_SpinLock *lock) -{ - /* FIXME: Should we have an eventual timeout? */ - while (!SDL_AtomicTryLock(lock)) { - SDL_Delay(0); - } -} - -void -SDL_AtomicUnlock(SDL_SpinLock *lock) -{ -#if defined(_MSC_VER) - _ReadWriteBarrier(); - *lock = 0; - -#elif HAVE_GCC_ATOMICS || HAVE_GCC_SYNC_LOCK_TEST_AND_SET - __sync_lock_release(lock); - -#elif defined(__SOLARIS__) - /* Used for Solaris when not using gcc. */ - *lock = 0; - membar_producer(); - -#else - *lock = 0; -#endif -} - -/* vi: set ts=4 sw=4 expandtab: */ |