/usr/lib/erlang/erts-6.2/include/internal/win/ethr_dw_atomic.h is in erlang-dev 1:17.3-dfsg-4+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | /*
* %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__ */
|