Current File : //usr/include/mysql/server/private/atomic/generic-msvc.h
#ifndef ATOMIC_MSC_INCLUDED
#define ATOMIC_MSC_INCLUDED
/* Copyright (c) 2006, 2014, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
#include <windows.h>
static inline int my_atomic_cas32(int32 volatile *a, int32 *cmp, int32 set)
{
int32 initial_cmp= *cmp;
int32 initial_a= InterlockedCompareExchange((volatile LONG*)a,
set, initial_cmp);
int ret= (initial_a == initial_cmp);
if (!ret)
*cmp= initial_a;
return ret;
}
static inline int my_atomic_cas64(int64 volatile *a, int64 *cmp, int64 set)
{
int64 initial_cmp= *cmp;
int64 initial_a= InterlockedCompareExchange64((volatile LONGLONG*)a,
(LONGLONG)set,
(LONGLONG)initial_cmp);
int ret= (initial_a == initial_cmp);
if (!ret)
*cmp= initial_a;
return ret;
}
static inline int my_atomic_casptr(void * volatile *a, void **cmp, void *set)
{
void *initial_cmp= *cmp;
void *initial_a= InterlockedCompareExchangePointer(a, set, initial_cmp);
int ret= (initial_a == initial_cmp);
if (!ret)
*cmp= initial_a;
return ret;
}
static inline int32 my_atomic_add32(int32 volatile *a, int32 v)
{
return (int32)InterlockedExchangeAdd((volatile LONG*)a, v);
}
static inline int64 my_atomic_add64(int64 volatile *a, int64 v)
{
return (int64)InterlockedExchangeAdd64((volatile LONGLONG*)a, (LONGLONG)v);
}
/*
According to MSDN:
Simple reads and writes to properly-aligned 32-bit variables are atomic
operations.
...
Simple reads and writes to properly aligned 64-bit variables are atomic on
64-bit Windows. Reads and writes to 64-bit values are not guaranteed to be
atomic on 32-bit Windows.
https://msdn.microsoft.com/en-us/library/windows/desktop/ms684122(v=vs.85).aspx
*/
static inline int32 my_atomic_load32(int32 volatile *a)
{
int32 value= *a;
MemoryBarrier();
return value;
}
static inline int64 my_atomic_load64(int64 volatile *a)
{
#ifdef _M_X64
int64 value= *a;
MemoryBarrier();
return value;
#else
return (int64) InterlockedCompareExchange64((volatile LONGLONG *) a, 0, 0);
#endif
}
static inline void* my_atomic_loadptr(void * volatile *a)
{
void *value= *a;
MemoryBarrier();
return value;
}
static inline int32 my_atomic_fas32(int32 volatile *a, int32 v)
{
return (int32)InterlockedExchange((volatile LONG*)a, v);
}
static inline int64 my_atomic_fas64(int64 volatile *a, int64 v)
{
return (int64)InterlockedExchange64((volatile LONGLONG*)a, v);
}
static inline void * my_atomic_fasptr(void * volatile *a, void * v)
{
return InterlockedExchangePointer(a, v);
}
static inline void my_atomic_store32(int32 volatile *a, int32 v)
{
MemoryBarrier();
*a= v;
}
static inline void my_atomic_store64(int64 volatile *a, int64 v)
{
#ifdef _M_X64
MemoryBarrier();
*a= v;
#else
(void) InterlockedExchange64((volatile LONGLONG *) a, v);
#endif
}
static inline void my_atomic_storeptr(void * volatile *a, void *v)
{
MemoryBarrier();
*a= v;
}
#endif /* ATOMIC_MSC_INCLUDED */
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