diff options
Diffstat (limited to '3rdparty/SDL2/src/atomic/SDL_atomic.c')
-rw-r--r-- | 3rdparty/SDL2/src/atomic/SDL_atomic.c | 246 |
1 files changed, 0 insertions, 246 deletions
diff --git a/3rdparty/SDL2/src/atomic/SDL_atomic.c b/3rdparty/SDL2/src/atomic/SDL_atomic.c deleted file mode 100644 index db86d6eda82..00000000000 --- a/3rdparty/SDL2/src/atomic/SDL_atomic.c +++ /dev/null @@ -1,246 +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" - -#include "SDL_atomic.h" - -#if defined(_MSC_VER) && (_MSC_VER >= 1500) -#include <intrin.h> -#define HAVE_MSC_ATOMICS 1 -#endif - -#if defined(__MACOSX__) /* !!! FIXME: should we favor gcc atomics? */ -#include <libkern/OSAtomic.h> -#endif - -#if !defined(HAVE_GCC_ATOMICS) && defined(__SOLARIS__) -#include <atomic.h> -#endif - -/* - If any of the operations are not provided then we must emulate some - of them. That means we need a nice implementation of spin locks - that avoids the "one big lock" problem. We use a vector of spin - locks and pick which one to use based on the address of the operand - of the function. - - To generate the index of the lock we first shift by 3 bits to get - rid on the zero bits that result from 32 and 64 bit allignment of - data. We then mask off all but 5 bits and use those 5 bits as an - index into the table. - - Picking the lock this way insures that accesses to the same data at - the same time will go to the same lock. OTOH, accesses to different - data have only a 1/32 chance of hitting the same lock. That should - pretty much eliminate the chances of several atomic operations on - different data from waiting on the same "big lock". If it isn't - then the table of locks can be expanded to a new size so long as - the new size is a power of two. - - Contributed by Bob Pendleton, bob@pendleton.com -*/ - -#if !defined(HAVE_MSC_ATOMICS) && !defined(HAVE_GCC_ATOMICS) && !defined(__MACOSX__) && !defined(__SOLARIS__) -#define EMULATE_CAS 1 -#endif - -#if EMULATE_CAS -static SDL_SpinLock locks[32]; - -static SDL_INLINE void -enterLock(void *a) -{ - uintptr_t index = ((((uintptr_t)a) >> 3) & 0x1f); - - SDL_AtomicLock(&locks[index]); -} - -static SDL_INLINE void -leaveLock(void *a) -{ - uintptr_t index = ((((uintptr_t)a) >> 3) & 0x1f); - - SDL_AtomicUnlock(&locks[index]); -} -#endif - - -SDL_bool -SDL_AtomicCAS(SDL_atomic_t *a, int oldval, int newval) -{ -#ifdef HAVE_MSC_ATOMICS - return (_InterlockedCompareExchange((long*)&a->value, (long)newval, (long)oldval) == (long)oldval); -#elif defined(__MACOSX__) /* !!! FIXME: should we favor gcc atomics? */ - return (SDL_bool) OSAtomicCompareAndSwap32Barrier(oldval, newval, &a->value); -#elif defined(HAVE_GCC_ATOMICS) - return (SDL_bool) __sync_bool_compare_and_swap(&a->value, oldval, newval); -#elif defined(__SOLARIS__) && defined(_LP64) - return (SDL_bool) ((int) atomic_cas_64((volatile uint64_t*)&a->value, (uint64_t)oldval, (uint64_t)newval) == oldval); -#elif defined(__SOLARIS__) && !defined(_LP64) - return (SDL_bool) ((int) atomic_cas_32((volatile uint32_t*)&a->value, (uint32_t)oldval, (uint32_t)newval) == oldval); -#elif EMULATE_CAS - SDL_bool retval = SDL_FALSE; - - enterLock(a); - if (a->value == oldval) { - a->value = newval; - retval = SDL_TRUE; - } - leaveLock(a); - - return retval; -#else - #error Please define your platform. -#endif -} - -SDL_bool -SDL_AtomicCASPtr(void **a, void *oldval, void *newval) -{ -#if defined(HAVE_MSC_ATOMICS) && (_M_IX86) - return (_InterlockedCompareExchange((long*)a, (long)newval, (long)oldval) == (long)oldval); -#elif defined(HAVE_MSC_ATOMICS) && (!_M_IX86) - return (_InterlockedCompareExchangePointer(a, newval, oldval) == oldval); -#elif defined(__MACOSX__) && defined(__LP64__) /* !!! FIXME: should we favor gcc atomics? */ - return (SDL_bool) OSAtomicCompareAndSwap64Barrier((int64_t)oldval, (int64_t)newval, (int64_t*) a); -#elif defined(__MACOSX__) && !defined(__LP64__) /* !!! FIXME: should we favor gcc atomics? */ - return (SDL_bool) OSAtomicCompareAndSwap32Barrier((int32_t)oldval, (int32_t)newval, (int32_t*) a); -#elif defined(HAVE_GCC_ATOMICS) - return __sync_bool_compare_and_swap(a, oldval, newval); -#elif defined(__SOLARIS__) - return (SDL_bool) (atomic_cas_ptr(a, oldval, newval) == oldval); -#elif EMULATE_CAS - SDL_bool retval = SDL_FALSE; - - enterLock(a); - if (*a == oldval) { - *a = newval; - retval = SDL_TRUE; - } - leaveLock(a); - - return retval; -#else - #error Please define your platform. -#endif -} - -int -SDL_AtomicSet(SDL_atomic_t *a, int v) -{ -#ifdef HAVE_MSC_ATOMICS - return _InterlockedExchange((long*)&a->value, v); -#elif defined(HAVE_GCC_ATOMICS) - return __sync_lock_test_and_set(&a->value, v); -#elif defined(__SOLARIS__) && defined(_LP64) - return (int) atomic_swap_64((volatile uint64_t*)&a->value, (uint64_t)v); -#elif defined(__SOLARIS__) && !defined(_LP64) - return (int) atomic_swap_32((volatile uint32_t*)&a->value, (uint32_t)v); -#else - int value; - do { - value = a->value; - } while (!SDL_AtomicCAS(a, value, v)); - return value; -#endif -} - -void* -SDL_AtomicSetPtr(void **a, void *v) -{ -#if defined(HAVE_MSC_ATOMICS) && (_M_IX86) - return (void *) _InterlockedExchange((long *)a, (long) v); -#elif defined(HAVE_MSC_ATOMICS) && (!_M_IX86) - return _InterlockedExchangePointer(a, v); -#elif defined(HAVE_GCC_ATOMICS) - return __sync_lock_test_and_set(a, v); -#elif defined(__SOLARIS__) - return atomic_swap_ptr(a, v); -#else - void *value; - do { - value = *a; - } while (!SDL_AtomicCASPtr(a, value, v)); - return value; -#endif -} - -int -SDL_AtomicAdd(SDL_atomic_t *a, int v) -{ -#ifdef HAVE_MSC_ATOMICS - return _InterlockedExchangeAdd((long*)&a->value, v); -#elif defined(HAVE_GCC_ATOMICS) - return __sync_fetch_and_add(&a->value, v); -#elif defined(__SOLARIS__) - int pv = a->value; - membar_consumer(); -#if defined(_LP64) - atomic_add_64((volatile uint64_t*)&a->value, v); -#elif !defined(_LP64) - atomic_add_32((volatile uint32_t*)&a->value, v); -#endif - return pv; -#else - int value; - do { - value = a->value; - } while (!SDL_AtomicCAS(a, value, (value + v))); - return value; -#endif -} - -int -SDL_AtomicGet(SDL_atomic_t *a) -{ - int value; - do { - value = a->value; - } while (!SDL_AtomicCAS(a, value, value)); - return value; -} - -void * -SDL_AtomicGetPtr(void **a) -{ - void *value; - do { - value = *a; - } while (!SDL_AtomicCASPtr(a, value, value)); - return value; -} - -#ifdef __thumb__ -#if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6T2__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) -__asm__( -" .align 2\n" -" .globl _SDL_MemoryBarrierRelease\n" -" .globl _SDL_MemoryBarrierAcquire\n" -"_SDL_MemoryBarrierRelease:\n" -"_SDL_MemoryBarrierAcquire:\n" -" mov r0, #0\n" -" mcr p15, 0, r0, c7, c10, 5\n" -" bx lr\n" -); -#endif -#endif - -/* vi: set ts=4 sw=4 expandtab: */ |