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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2010. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Description: Native atomics ethread support when using VC++
* Author: Rickard Green
*/
#ifndef ETHR_WIN_ATOMIC_H__
#define ETHR_WIN_ATOMIC_H__
#ifdef _MSC_VER
# if _MSC_VER < 1300
# define ETHR_IMMED_ATOMIC_SET_GET_SAFE__ 0 /* Dont trust really old compilers */
# else
# if defined(_M_IX86)
# define ETHR_IMMED_ATOMIC_SET_GET_SAFE__ 1
# else /* I.e. IA64 */
# if _MSC_VER >= 1400
# define ETHR_IMMED_ATOMIC_SET_GET_SAFE__ 1
# else
# define ETHR_IMMED_ATOMIC_SET_GET_SAFE__ 0
# endif
# endif
# endif
# if _MSC_VER >= 1400
# include <intrin.h>
# undef ETHR_COMPILER_BARRIER
# define ETHR_COMPILER_BARRIER _ReadWriteBarrier()
# endif
#pragma intrinsic(_ReadWriteBarrier)
#pragma intrinsic(_InterlockedAnd)
#pragma intrinsic(_InterlockedOr)
#else
# define ETHR_IMMED_ATOMIC_SET_GET_SAFE__ 0
#endif
/*
* No configure test checking for _Interlocked*_{acq,rel} and
* Interlocked*{Acquire,Release} have been written yet...
*
* Note, that these are pure optimizations for the itanium
* processor.
*/
#ifdef ETHR_HAVE_INTERLOCKEDCOMPAREEXCHANGE_ACQ
#pragma intrinsic(_InterlockedCompareExchange_acq)
#endif
#ifdef ETHR_HAVE_INTERLOCKEDCOMPAREEXCHANGE_REL
#pragma intrinsic(_InterlockedCompareExchange_rel)
#endif
typedef struct {
volatile LONG value;
} ethr_native_atomic_t;
#define ETHR_MEMORY_BARRIER \
do { \
volatile LONG x___ = 0; \
_InterlockedCompareExchange(&x___, (LONG) 1, (LONG) 0); \
} while (0)
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_AUX_IMPL__)
static ETHR_INLINE void
ethr_native_atomic_init(ethr_native_atomic_t *var, long i)
{
var->value = (LONG) i;
}
static ETHR_INLINE void
ethr_native_atomic_set(ethr_native_atomic_t *var, long i)
{
#if ETHR_IMMED_ATOMIC_SET_GET_SAFE__
var->value = (LONG) i;
#else
(void) InterlockedExchange(&var->value, (LONG) i);
#endif
}
static ETHR_INLINE long
ethr_native_atomic_read(ethr_native_atomic_t *var)
{
#if ETHR_IMMED_ATOMIC_SET_GET_SAFE__
return var->value;
#else
return InterlockedExchangeAdd(&var->value, (LONG) 0);
#endif
}
static ETHR_INLINE void
ethr_native_atomic_add(ethr_native_atomic_t *var, long incr)
{
(void) InterlockedExchangeAdd(&var->value, (LONG) incr);
}
static ETHR_INLINE long
ethr_native_atomic_add_return(ethr_native_atomic_t *var, long i)
{
LONG tmp = InterlockedExchangeAdd(&var->value, (LONG) i);
return tmp + i;
}
static ETHR_INLINE void
ethr_native_atomic_inc(ethr_native_atomic_t *var)
{
(void) InterlockedIncrement(&var->value);
}
static ETHR_INLINE void
ethr_native_atomic_dec(ethr_native_atomic_t *var)
{
(void) InterlockedDecrement(&var->value);
}
static ETHR_INLINE long
ethr_native_atomic_inc_return(ethr_native_atomic_t *var)
{
return (long) InterlockedIncrement(&var->value);
}
static ETHR_INLINE long
ethr_native_atomic_dec_return(ethr_native_atomic_t *var)
{
return (long) InterlockedDecrement(&var->value);
}
static ETHR_INLINE long
ethr_native_atomic_and_retold(ethr_native_atomic_t *var, long mask)
{
return (long) _InterlockedAnd(&var->value, mask);
}
static ETHR_INLINE long
ethr_native_atomic_or_retold(ethr_native_atomic_t *var, long mask)
{
return (long) _InterlockedOr(&var->value, mask);
}
static ETHR_INLINE long
ethr_native_atomic_cmpxchg(ethr_native_atomic_t *var, long new, long old)
{
return (long) _InterlockedCompareExchange(&var->value, (LONG) new, (LONG) old);
}
static ETHR_INLINE long
ethr_native_atomic_xchg(ethr_native_atomic_t *var, long new)
{
return (long) InterlockedExchange(&var->value, (LONG) new);
}
/*
* Atomic ops with at least specified barriers.
*/
static ETHR_INLINE long
ethr_native_atomic_read_acqb(ethr_native_atomic_t *var)
{
#ifdef ETHR_HAVE_INTERLOCKEDEXCHANGEADDACQUIRE
return (long) InterlockedExchangeAddAcquire(&var->value, (LONG) 0);
#else
return (long) InterlockedExchangeAdd(&var->value, (LONG) 0);
#endif
}
static ETHR_INLINE long
ethr_native_atomic_inc_return_acqb(ethr_native_atomic_t *var)
{
#ifdef ETHR_HAVE_INTERLOCKEDINCREMENTACQUIRE
return (long) InterlockedIncrementAcquire(&var->value);
#else
return (long) InterlockedIncrement(&var->value);
#endif
}
static ETHR_INLINE void
ethr_native_atomic_set_relb(ethr_native_atomic_t *var, long i)
{
(void) InterlockedExchange(&var->value, (LONG) i);
}
static ETHR_INLINE void
ethr_native_atomic_dec_relb(ethr_native_atomic_t *var)
{
#ifdef ETHR_HAVE_INTERLOCKEDDECREMENTRELEASE
(void) InterlockedDecrementRelease(&var->value);
#else
(void) InterlockedDecrement(&var->value);
#endif
}
static ETHR_INLINE long
ethr_native_atomic_dec_return_relb(ethr_native_atomic_t *var)
{
#ifdef ETHR_HAVE_INTERLOCKEDDECREMENTRELEASE
return (long) InterlockedDecrementRelease(&var->value);
#else
return (long) InterlockedDecrement(&var->value);
#endif
}
static ETHR_INLINE long
ethr_native_atomic_cmpxchg_acqb(ethr_native_atomic_t *var, long new, long old)
{
#ifdef ETHR_HAVE_INTERLOCKEDCOMPAREEXCHANGE_ACQ
return (long) _InterlockedCompareExchange_acq(&var->value, (LONG) new, (LONG) old);
#else
return (long) _InterlockedCompareExchange(&var->value, (LONG) new, (LONG) old);
#endif
}
static ETHR_INLINE long
ethr_native_atomic_cmpxchg_relb(ethr_native_atomic_t *var, long new, long old)
{
#ifdef ETHR_HAVE_INTERLOCKEDCOMPAREEXCHANGE_REL
return (long) _InterlockedCompareExchange_rel(&var->value, (LONG) new, (LONG) old);
#else
return (long) _InterlockedCompareExchange(&var->value, (LONG) new, (LONG) old);
#endif
}
#endif
#endif
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