/usr/lib/erlang/erts-6.2/include/internal/win/ethr_membar.h is in erlang-dev 1:17.3-dfsg-4+deb8u2.
This file is owned by root:root, with mode 0o644.
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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 | /*
* %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: Memory barriers for Windows
* Author: Rickard Green
*/
#if (!defined(ETHR_WIN_MEMBAR_H__) \
&& (defined(_MSC_VER) && _MSC_VER >= 1400) \
&& (defined(_M_AMD64) \
|| defined(_M_IA64) \
|| defined(ETHR_HAVE__INTERLOCKEDCOMPAREEXCHANGE)))
#define ETHR_WIN_MEMBAR_H__
#define ETHR_LoadLoad (1 << 0)
#define ETHR_LoadStore (1 << 1)
#define ETHR_StoreLoad (1 << 2)
#define ETHR_StoreStore (1 << 3)
#include <intrin.h>
#undef ETHR_COMPILER_BARRIER
#define ETHR_COMPILER_BARRIER _ReadWriteBarrier()
#pragma intrinsic(_ReadWriteBarrier)
#pragma intrinsic(_InterlockedCompareExchange)
#define ETHR_MB_USING_INTERLOCKED__ \
do { \
volatile long x___ = 0; \
(void) _InterlockedCompareExchange(&x___, 2, 1); \
} while (0)
#if defined(_M_IA64)
#define ETHR_MEMBAR(B) __mf()
#elif defined(_M_AMD64) || defined(_M_IX86)
#include <emmintrin.h>
#include <mmintrin.h>
#if ETHR_SIZEOF_PTR == 4
# define ETHR_NO_SSE2_MB__ ETHR_MB_USING_INTERLOCKED__
#endif
#pragma intrinsic(_mm_mfence)
#pragma intrinsic(_mm_sfence)
#pragma intrinsic(_mm_lfence)
static ETHR_FORCE_INLINE void
ethr_cfence__(void)
{
_ReadWriteBarrier();
}
static ETHR_FORCE_INLINE void
ethr_mfence__(void)
{
#if ETHR_SIZEOF_PTR == 4
if (ETHR_X86_RUNTIME_CONF_HAVE_NO_SSE2__)
ETHR_NO_SSE2_MB__;
else
#endif
_mm_mfence();
}
static ETHR_FORCE_INLINE void
ethr_sfence__(void)
{
#if ETHR_SIZEOF_PTR == 4
if (ETHR_X86_RUNTIME_CONF_HAVE_NO_SSE2__)
ETHR_NO_SSE2_MB__;
else
#endif
_mm_sfence();
}
static ETHR_FORCE_INLINE void
ethr_lfence__(void)
{
#if ETHR_SIZEOF_PTR == 4
if (ETHR_X86_RUNTIME_CONF_HAVE_NO_SSE2__)
ETHR_NO_SSE2_MB__;
else
#endif
_mm_lfence();
}
#define ETHR_X86_OUT_OF_ORDER_MEMBAR(B) \
ETHR_CHOOSE_EXPR((B) == ETHR_StoreStore, \
ethr_sfence__(), \
ETHR_CHOOSE_EXPR((B) == ETHR_LoadLoad, \
ethr_lfence__(), \
ethr_mfence__()))
#ifdef ETHR_X86_OUT_OF_ORDER
#define ETHR_MEMBAR(B) \
ETHR_X86_OUT_OF_ORDER_MEMBAR((B))
#else /* !ETHR_X86_OUT_OF_ORDER (the default) */
/*
* We assume that only stores before loads may be reordered. That is,
* we assume that *no* instructions like these are used:
* - CLFLUSH,
* - streaming stores executed with non-temporal move,
* - string operations, or
* - other instructions which aren't LoadLoad, LoadStore, and StoreStore
* ordered by themselves
* If such instructions are used, either insert memory barriers
* using ETHR_X86_OUT_OF_ORDER_MEMBAR() at appropriate places, or
* define ETHR_X86_OUT_OF_ORDER. For more info see Intel 64 and IA-32
* Architectures Software Developer's Manual; Vol 3A; Chapter 8.2.2.
*/
#define ETHR_MEMBAR(B) \
ETHR_CHOOSE_EXPR((B) & ETHR_StoreLoad, ethr_mfence__(), ethr_cfence__())
#endif
#else /* No knowledge about platform; use interlocked fallback */
#define ETHR_MEMBAR(B) ETHR_MB_USING_INTERLOCKED__
#define ETHR_READ_DEPEND_MEMORY_BARRIER ETHR_MB_USING_INTERLOCKED__
#endif
#endif /* ETHR_WIN_MEMBAR_H__ */
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