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/*-------------------------------------------------------------------------
*
* generic-msvc.h
* Atomic operations support when using MSVC
*
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* NOTES:
*
* Documentation:
* * Interlocked Variable Access
* http://msdn.microsoft.com/en-us/library/ms684122%28VS.85%29.aspx
*
* src/include/port/atomics/generic-msvc.h
*
*-------------------------------------------------------------------------
*/
#include <intrin.h>
/* intentionally no include guards, should only be included by atomics.h */
#ifndef INSIDE_ATOMICS_H
#error "should be included via atomics.h"
#endif
#pragma intrinsic(_ReadWriteBarrier)
#define pg_compiler_barrier_impl() _ReadWriteBarrier()
#ifndef pg_memory_barrier_impl
#define pg_memory_barrier_impl() MemoryBarrier()
#endif
#if defined(HAVE_ATOMICS)
#define PG_HAVE_ATOMIC_U32_SUPPORT
typedef struct pg_atomic_uint32
{
volatile uint32 value;
} pg_atomic_uint32;
#define PG_HAVE_ATOMIC_U64_SUPPORT
typedef struct __declspec(align(8)) pg_atomic_uint64
{
volatile uint64 value;
} pg_atomic_uint64;
#define PG_HAVE_ATOMIC_COMPARE_EXCHANGE_U32
static inline bool
pg_atomic_compare_exchange_u32_impl(volatile pg_atomic_uint32 *ptr,
uint32 *expected, uint32 newval)
{
bool ret;
uint32 current;
current = InterlockedCompareExchange(&ptr->value, newval, *expected);
ret = current == *expected;
*expected = current;
return ret;
}
#define PG_HAVE_ATOMIC_FETCH_ADD_U32
static inline uint32
pg_atomic_fetch_add_u32_impl(volatile pg_atomic_uint32 *ptr, int32 add_)
{
return InterlockedExchangeAdd(&ptr->value, add_);
}
/*
* The non-intrinsics versions are only available in vista upwards, so use the
* intrinsic version. Only supported on >486, but we require XP as a minimum
* baseline, which doesn't support the 486, so we don't need to add checks for
* that case.
*/
#pragma intrinsic(_InterlockedCompareExchange64)
#define PG_HAVE_ATOMIC_COMPARE_EXCHANGE_U64
static inline bool
pg_atomic_compare_exchange_u64_impl(volatile pg_atomic_uint64 *ptr,
uint64 *expected, uint64 newval)
{
bool ret;
uint64 current;
current = _InterlockedCompareExchange64(&ptr->value, newval, *expected);
ret = current == *expected;
*expected = current;
return ret;
}
/* Only implemented on itanium and 64bit builds */
#ifdef _WIN64
#pragma intrinsic(_InterlockedExchangeAdd64)
#define PG_HAVE_ATOMIC_FETCH_ADD_U64
static inline uint64
pg_atomic_fetch_add_u64_impl(volatile pg_atomic_uint64 *ptr, int64 add_)
{
return _InterlockedExchangeAdd64(&ptr->value, add_);
}
#endif /* _WIN64 */
#endif /* HAVE_ATOMICS */
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