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inc: fsctl.h: atomics

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Bill Zissimopoulos 2022-01-17 14:33:34 +00:00
parent 04c2f0120c
commit 362b9ceb7c
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1 changed files with 87 additions and 0 deletions
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inc/winfsp/fsctl.h
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@ -699,6 +699,93 @@ FSP_API NTSTATUS FspMountSet(FSP_MOUNT_DESC *Desc);
FSP_API NTSTATUS FspMountRemove(FSP_MOUNT_DESC *Desc);
#endif
/*
* Atomics
*
* See https://www.cl.cam.ac.uk/~pes20/cpp/cpp0xmappings.html (https://archive.is/mJfFX)
*/
#if _MSC_VER >= 1920 /* VS2019 or later */
__int32 __iso_volatile_load32(const volatile __int32 *);
void __iso_volatile_store32(volatile __int32 *, __int32);
__int64 __iso_volatile_load64(const volatile __int64 *);
void __iso_volatile_store64(volatile __int64 *, __int64);
#define FSP_ATOMIC_VOLATILE_LOAD32(p) __iso_volatile_load32(p)
#define FSP_ATOMIC_VOLATILE_STORE32(p,v)__iso_volatile_store32(p,v)
#define FSP_ATOMIC_VOLATILE_LOAD64(p) __iso_volatile_load64(p)
#define FSP_ATOMIC_VOLATILE_STORE64(p,v)__iso_volatile_store64(p,v)
#else
#define FSP_ATOMIC_VOLATILE_LOAD32(p) (*(p))
#define FSP_ATOMIC_VOLATILE_STORE32(p,v)(*(p) = (v))
#define FSP_ATOMIC_VOLATILE_LOAD64(p) (*(p))
#define FSP_ATOMIC_VOLATILE_STORE64(p,v)(*(p) = (v))
#endif
static inline INT32 FspAtomicLoad32(INT32 volatile *p)
{
#if defined(_M_ARM64)
void __dmb(unsigned int);
INT32 v = FSP_ATOMIC_VOLATILE_LOAD32(p);
__dmb(0xb);
return v;
#elif defined(_M_X64) || defined(_M_IX86)
void _ReadWriteBarrier(void);
INT32 v = FSP_ATOMIC_VOLATILE_LOAD32(p);
_ReadWriteBarrier();
return v;
#endif
}
static inline VOID FspAtomicStore32(INT32 volatile *p, INT32 v)
{
#if defined(_M_ARM64)
void __dmb(unsigned int);
__dmb(0xb);
FSP_ATOMIC_VOLATILE_STORE32(p, v);
__dmb(0xb);
#elif defined(_M_X64) || defined(_M_IX86)
long _InterlockedExchange(long volatile *, long);
_InterlockedExchange((long volatile *)p, v);
#endif
}
static inline VOID *FspAtomicLoadPointer(VOID *volatile *p)
{
#if defined(_M_ARM64)
void __dmb(unsigned int);
VOID *v = (VOID *)FSP_ATOMIC_VOLATILE_LOAD64((__int64 volatile *)(p));
__dmb(0xb);
return v;
#elif defined(_M_X64)
void _ReadWriteBarrier(void);
VOID *v = (VOID *)FSP_ATOMIC_VOLATILE_LOAD64((__int64 volatile *)(p));
_ReadWriteBarrier();
return v;
#elif defined(_M_IX86)
void _ReadWriteBarrier(void);
VOID *v = (VOID *)FSP_ATOMIC_VOLATILE_LOAD32((__int32 volatile *)(p));
_ReadWriteBarrier();
return v;
#endif
}
static inline VOID FspAtomicStorePointer(VOID *volatile *p, VOID *v)
{
#if defined(_M_ARM64)
void __dmb(unsigned int);
__dmb(0xb);
FSP_ATOMIC_VOLATILE_STORE64((__int64 volatile *)(p), (__int64)(v));
__dmb(0xb);
#elif defined(_M_X64) || defined(_M_IX86)
void *_InterlockedExchangePointer(void *volatile *, void *);
_InterlockedExchangePointer(p, v);
#endif
}
#ifdef __cplusplus
}
#endif