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/*
* %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 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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