/* Simple DirectMedia Layer Copyright (C) 1997-2014 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 "SDL_atomic.h" #if defined(_MSC_VER) && (_MSC_VER >= 1500) #include #define HAVE_MSC_ATOMICS 1 #endif #if defined(__MACOSX__) /* !!! FIXME: should we favor gcc atomics? */ #include #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__) #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 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 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); #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); #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); #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: */