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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
commit | 6eb9c5a5657d1fe77b55cc261450f3538d35a94d (patch) | |
tree | 657d8194422a5daccecfd42d654b8a245ef7b4c8 /src/include/port/atomics/generic-msvc.h | |
parent | Initial commit. (diff) | |
download | postgresql-13-upstream.tar.xz postgresql-13-upstream.zip |
Adding upstream version 13.4.upstream/13.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/include/port/atomics/generic-msvc.h')
-rw-r--r-- | src/include/port/atomics/generic-msvc.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/include/port/atomics/generic-msvc.h b/src/include/port/atomics/generic-msvc.h new file mode 100644 index 0000000..c74c609 --- /dev/null +++ b/src/include/port/atomics/generic-msvc.h @@ -0,0 +1,101 @@ +/*------------------------------------------------------------------------- + * + * generic-msvc.h + * Atomic operations support when using MSVC + * + * Portions Copyright (c) 1996-2020, 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 */ |