59 #ifndef _SDL_atomic_h_
60 #define _SDL_atomic_h_
69 #if defined(_MSC_VER) && (_MSC_VER >= 1500)
71 #define HAVE_MSC_ATOMICS 1
96 typedef int SDL_SpinLock;
128 #if defined(_MSC_VER) && (_MSC_VER > 1200)
129 void _ReadWriteBarrier(
void);
130 #pragma intrinsic(_ReadWriteBarrier)
131 #define SDL_CompilerBarrier() _ReadWriteBarrier()
132 #elif defined(__GNUC__)
133 #define SDL_CompilerBarrier() __asm__ __volatile__ ("" : : : "memory")
135 #define SDL_CompilerBarrier() \
136 { SDL_SpinLock _tmp = 0; SDL_AtomicLock(&_tmp); SDL_AtomicUnlock(&_tmp); }
158 #if defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
159 #define SDL_MemoryBarrierRelease() __asm__ __volatile__ ("lwsync" : : : "memory")
160 #define SDL_MemoryBarrierAcquire() __asm__ __volatile__ ("lwsync" : : : "memory")
161 #elif defined(__GNUC__) && defined(__arm__)
162 #if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7EM__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__)
163 #define SDL_MemoryBarrierRelease() __asm__ __volatile__ ("dmb ish" : : : "memory")
164 #define SDL_MemoryBarrierAcquire() __asm__ __volatile__ ("dmb ish" : : : "memory")
165 #elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6T2__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__)
169 extern DECLSPEC
void SDLCALL SDL_MemoryBarrierAcquire();
171 #define SDL_MemoryBarrierRelease() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" : : "r"(0) : "memory")
172 #define SDL_MemoryBarrierAcquire() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" : : "r"(0) : "memory")
175 #define SDL_MemoryBarrierRelease() __asm__ __volatile__ ("" : : : "memory")
176 #define SDL_MemoryBarrierAcquire() __asm__ __volatile__ ("" : : : "memory")
180 #define SDL_MemoryBarrierRelease() SDL_CompilerBarrier()
181 #define SDL_MemoryBarrierAcquire() SDL_CompilerBarrier()
188 #if defined(SDL_ATOMIC_DISABLED) && SDL_ATOMIC_DISABLED
189 #define SDL_DISABLE_ATOMIC_INLINE
191 #ifndef SDL_DISABLE_ATOMIC_INLINE
193 #ifdef HAVE_MSC_ATOMICS
195 #define SDL_AtomicSet(a, v) _InterlockedExchange((long*)&(a)->value, (v))
196 #define SDL_AtomicAdd(a, v) _InterlockedExchangeAdd((long*)&(a)->value, (v))
197 #define SDL_AtomicCAS(a, oldval, newval) (_InterlockedCompareExchange((long*)&(a)->value, (newval), (oldval)) == (oldval))
198 #define SDL_AtomicSetPtr(a, v) _InterlockedExchangePointer((a), (v))
200 #define SDL_AtomicCASPtr(a, oldval, newval) (_InterlockedCompareExchange((long*)(a), (long)(newval), (long)(oldval)) == (long)(oldval))
202 #define SDL_AtomicCASPtr(a, oldval, newval) (_InterlockedCompareExchangePointer((a), (newval), (oldval)) == (oldval))
205 #elif defined(__MACOSX__)
206 #include <libkern/OSAtomic.h>
208 #define SDL_AtomicCAS(a, oldval, newval) OSAtomicCompareAndSwap32Barrier((oldval), (newval), &(a)->value)
210 #define SDL_AtomicCASPtr(a, oldval, newval) OSAtomicCompareAndSwap64Barrier((int64_t)(oldval), (int64_t)(newval), (int64_t*)(a))
212 #define SDL_AtomicCASPtr(a, oldval, newval) OSAtomicCompareAndSwap32Barrier((int32_t)(oldval), (int32_t)(newval), (int32_t*)(a))
215 #elif defined(HAVE_GCC_ATOMICS)
217 #define SDL_AtomicSet(a, v) __sync_lock_test_and_set(&(a)->value, v)
218 #define SDL_AtomicAdd(a, v) __sync_fetch_and_add(&(a)->value, v)
219 #define SDL_AtomicSetPtr(a, v) __sync_lock_test_and_set(a, v)
220 #define SDL_AtomicCAS(a, oldval, newval) __sync_bool_compare_and_swap(&(a)->value, oldval, newval)
221 #define SDL_AtomicCASPtr(a, oldval, newval) __sync_bool_compare_and_swap(a, oldval, newval)
232 #ifndef SDL_atomic_t_defined
243 #ifndef SDL_AtomicCAS
244 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCAS(
SDL_atomic_t *a,
int oldval,
int newval);
252 #ifndef SDL_AtomicSet
253 SDL_FORCE_INLINE
int SDL_AtomicSet(
SDL_atomic_t *a,
int v)
258 }
while (!SDL_AtomicCAS(a, value, v));
266 #ifndef SDL_AtomicGet
269 int value = a->value;
282 #ifndef SDL_AtomicAdd
283 SDL_FORCE_INLINE
int SDL_AtomicAdd(
SDL_atomic_t *a,
int v)
288 }
while (!SDL_AtomicCAS(a, value, (value + v)));
296 #ifndef SDL_AtomicIncRef
297 #define SDL_AtomicIncRef(a) SDL_AtomicAdd(a, 1)
306 #ifndef SDL_AtomicDecRef
307 #define SDL_AtomicDecRef(a) (SDL_AtomicAdd(a, -1) == 1)
317 #ifndef SDL_AtomicCASPtr
318 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCASPtr(
void* *a,
void *oldval,
void *newval);
326 #ifndef SDL_AtomicSetPtr
327 SDL_FORCE_INLINE
void* SDL_AtomicSetPtr(
void* *a,
void* v)
332 }
while (!SDL_AtomicCASPtr(a, value, v));
340 #ifndef SDL_AtomicGetPtr
SDL_FORCE_INLINE void * SDL_AtomicGetPtr(void **a)
Set a pointer to a new value if it is currently an old value.
Definition: SDL_atomic.h:341
#define SDL_CompilerBarrier()
Definition: SDL_atomic.h:135
DECLSPEC SDL_bool SDLCALL SDL_AtomicTryLock(SDL_SpinLock *lock)
Try to lock a spin lock by setting it to a non-zero value.
#define SDL_MemoryBarrierRelease()
Definition: SDL_atomic.h:180
SDL_FORCE_INLINE int SDL_AtomicGet(SDL_atomic_t *a)
Set an atomic variable to a new value if it is currently an old value.
Definition: SDL_atomic.h:267
DECLSPEC void SDLCALL SDL_AtomicLock(SDL_SpinLock *lock)
Lock a spin lock by setting it to a non-zero value.
A type representing an atomic integer value. It is a struct so people don't accidentally use numeric ...
Definition: SDL_atomic.h:233
DECLSPEC void SDLCALL SDL_AtomicUnlock(SDL_SpinLock *lock)
Unlock a spin lock by setting it to 0. Always returns immediately.