/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2011. 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 double word atomics for windows
* Author: Rickard Green
*/
#undef ETHR_INCLUDE_DW_ATOMIC_IMPL__
#ifndef ETHR_X86_DW_ATOMIC_H__
# define ETHR_X86_DW_ATOMIC_H__
# if ((ETHR_SIZEOF_PTR == 4 \
&& defined(ETHR_HAVE__INTERLOCKEDCOMPAREEXCHANGE64)) \
|| (ETHR_SIZEOF_PTR == 8 \
&& defined(ETHR_HAVE__INTERLOCKEDCOMPAREEXCHANGE128)))
# define ETHR_INCLUDE_DW_ATOMIC_IMPL__
# endif
#endif
#ifdef ETHR_INCLUDE_DW_ATOMIC_IMPL__
# if ETHR_SIZEOF_PTR == 4
# define ETHR_HAVE_NATIVE_SU_DW_ATOMIC
# else
# define ETHR_HAVE_NATIVE_DW_ATOMIC
# endif
# define ETHR_NATIVE_DW_ATOMIC_IMPL "windows-interlocked"
# if defined(_M_IX86) || defined(_M_AMD64)
/*
* If ETHR_RTCHK_USE_NATIVE_DW_ATOMIC_IMPL__ is defined, it will be used
* at runtime in order to determine if native or fallback implementation
* should be used.
*/
# define ETHR_RTCHK_USE_NATIVE_DW_ATOMIC_IMPL__ \
ETHR_X86_RUNTIME_CONF_HAVE_DW_CMPXCHG__
# endif
# include <intrin.h>
# if ETHR_SIZEOF_PTR == 4
# pragma intrinsic(_InterlockedCompareExchange64)
# define ETHR_DW_NATMC_ALIGN_MASK__ 0x7
# define ETHR_NATIVE_SU_DW_SINT_T ethr_sint64_t
# else
# pragma intrinsic(_InterlockedCompareExchange128)
# define ETHR_DW_NATMC_ALIGN_MASK__ 0xf
# endif
typedef volatile __int64 * ethr_native_dw_ptr_t;
/*
* We need 16 byte aligned memory in 64-bit mode, and 8 byte aligned
* memory in 32-bit mode. 16 byte aligned malloc in 64-bit mode is
* not common, and at least some glibc malloc implementations
* only 4 byte align in 32-bit mode.
*
* This code assumes 8 byte aligned memory in 64-bit mode, and 4 byte
* aligned memory in 32-bit mode. A malloc implementation that does
* not adhere to these alignment requirements is seriously broken,
* and we wont bother trying to work around it.
*
* Since memory alignment may be off by one word we need to align at
* runtime. We, therefore, need an extra word allocated.
*/
#define ETHR_DW_NATMC_MEM__(VAR) \
(&var->c[(int) ((ethr_uint_t) &(VAR)->c[0]) & ETHR_DW_NATMC_ALIGN_MASK__])
typedef union {
#ifdef ETHR_NATIVE_SU_DW_SINT_T
volatile ETHR_NATIVE_SU_DW_SINT_T dw_sint;
#endif
volatile ethr_sint_t sint[3];
volatile char c[ETHR_SIZEOF_PTR*3];
} ethr_native_dw_atomic_t;
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_ATOMIC_IMPL__)
#ifdef ETHR_DEBUG
# define ETHR_DW_DBG_ALIGNED__(PTR) \
ETHR_ASSERT((((ethr_uint_t) (PTR)) & ETHR_DW_NATMC_ALIGN_MASK__) == 0);
#else
# define ETHR_DW_DBG_ALIGNED__(PTR)
#endif
#define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_ADDR
static ETHR_INLINE ethr_sint_t *
ethr_native_dw_atomic_addr(ethr_native_dw_atomic_t *var)
{
ethr_sint_t *p = (ethr_sint_t *) ETHR_DW_NATMC_MEM__(var);
ETHR_DW_DBG_ALIGNED__(p);
return p;
}
#if ETHR_SIZEOF_PTR == 4
#define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_CMPXCHG_MB
static ETHR_INLINE ethr_sint64_t
ethr_native_su_dw_atomic_cmpxchg_mb(ethr_native_dw_atomic_t *var,
ethr_sint64_t new,
ethr_sint64_t exp)
{
ethr_native_dw_ptr_t p = (ethr_native_dw_ptr_t) ETHR_DW_NATMC_MEM__(var);
ETHR_DW_DBG_ALIGNED__(p);
return (ethr_sint64_t) _InterlockedCompareExchange64(p, new, exp);
}
#elif ETHR_SIZEOF_PTR == 8
#define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_CMPXCHG_MB
#ifdef ETHR_BIGENDIAN
# define ETHR_WIN_LOW_WORD__ 1
# define ETHR_WIN_HIGH_WORD__ 0
#else
# define ETHR_WIN_LOW_WORD__ 0
# define ETHR_WIN_HIGH_WORD__ 1
#endif
static ETHR_INLINE int
ethr_native_dw_atomic_cmpxchg_mb(ethr_native_dw_atomic_t *var,
ethr_sint_t *new,
ethr_sint_t *xchg)
{
ethr_native_dw_ptr_t p = (ethr_native_dw_ptr_t) ETHR_DW_NATMC_MEM__(var);
ETHR_DW_DBG_ALIGNED__(p);
return (int) _InterlockedCompareExchange128(p,
new[ETHR_WIN_HIGH_WORD__],
new[ETHR_WIN_LOW_WORD__],
xchg);
}
#endif
#endif /* ETHR_TRY_INLINE_FUNCS */
#endif /* ETHR_INCLUDE_DW_ATOMIC_IMPL__ */
