/usr/lib/erlang/erts-7.3/include/internal/libatomic_ops/ethr_membar.h is in erlang-dev 1:18.3-dfsg-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* %CopyrightBegin%
*
* Copyright Ericsson AB 2011. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/*
* Description: Memory barriers when using libatomic_ops
* Author: Rickard Green
*/
#ifndef ETHR_LIBATOMIC_OPS_MEMBAR_H__
#define ETHR_LIBATOMIC_OPS_MEMBAR_H__
#define ETHR_LoadLoad (1 << 0)
#define ETHR_LoadStore (1 << 1)
#define ETHR_StoreLoad (1 << 2)
#define ETHR_StoreStore (1 << 3)
#ifndef AO_HAVE_nop_full
# error "No AO_nop_full()"
#endif
static __inline__ void
ethr_mb__(void)
{
AO_nop_full();
}
static __inline__ void
ethr_rb__(void)
{
#ifdef AO_HAVE_nop_read
AO_nop_read();
#else
AO_nop_full();
#endif
}
static __inline__ void
ethr_wb__(void)
{
#ifdef AO_HAVE_nop_write
AO_nop_write();
#else
AO_nop_full();
#endif
}
#define ETHR_MEMBAR(B) \
ETHR_CHOOSE_EXPR((B) == ETHR_StoreStore, \
ethr_wb__(), \
ETHR_CHOOSE_EXPR((B) == ETHR_LoadLoad, \
ethr_rb__(), \
ethr_mb__()))
#define ETHR_COMPILER_BARRIER AO_compiler_barrier()
#ifdef AO_NO_DD_ORDERING
# define ETHR_READ_DEPEND_MEMORY_BARRIER ETHR_READ_MEMORY_BARRIER
#endif
#endif /* ETHR_LIBATOMIC_OPS_MEMBAR_H__ */
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