/usr/lib/erlang/erts-6.2/include/internal/libatomic_ops/ethr_atomic.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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* %CopyrightBegin%
*
* Copyright Ericsson AB 2010-2011. 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 atomics ethread support using libatomic_ops
* Author: Rickard Green
*/
#ifndef ETHR_LIBATOMIC_OPS_ATOMIC_H__
#define ETHR_LIBATOMIC_OPS_ATOMIC_H__
/*
* libatomic_ops can be downloaded from:
* http://www.hpl.hp.com/research/linux/atomic_ops/
*
* These operations need to be defined by libatomic_ops;
* otherwise, we won't compile:
* - AO_nop_full()
* - AO_load()
* - AO_store()
* - AO_compare_and_swap()
*
*/
#if ETHR_SIZEOF_AO_T == 4
#define ETHR_HAVE_NATIVE_ATOMIC32 1
#define ETHR_NATIVE_ATOMIC32_IMPL "libatomic_ops"
#define ETHR_NATMC_FUNC__(X) ethr_native_atomic32_ ## X
#define ETHR_ATMC_T__ ethr_native_atomic32_t
#define ETHR_AINT_T__ ethr_sint32_t
#define ETHR_AINT_SUFFIX__ "l"
#elif ETHR_SIZEOF_AO_T == 8
#define ETHR_HAVE_NATIVE_ATOMIC64 1
#define ETHR_NATIVE_ATOMIC64_IMPL "libatomic_ops"
#define ETHR_NATMC_FUNC__(X) ethr_native_atomic64_ ## X
#define ETHR_ATMC_T__ ethr_native_atomic64_t
#define ETHR_AINT_T__ ethr_sint64_t
#define ETHR_AINT_SUFFIX__ "q"
#else
#error "Unsupported integer size"
#endif
typedef struct {
volatile AO_t counter;
} ETHR_ATMC_T__;
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_ATOMIC_IMPL__)
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_ADDR 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_ADDR 1
#endif
static ETHR_INLINE ETHR_AINT_T__ *
ETHR_NATMC_FUNC__(addr)(ETHR_ATMC_T__ *var)
{
return (ETHR_AINT_T__ *) &var->counter;
}
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_SET 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_SET 1
#endif
static ETHR_INLINE void
ETHR_NATMC_FUNC__(set)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ value)
{
AO_store(&var->counter, (AO_t) value);
}
#ifdef AO_HAVE_store_release
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_SET_RELB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_SET_RELB 1
#endif
static ETHR_INLINE void
ETHR_NATMC_FUNC__(set_relb)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ value)
{
AO_store_release(&var->counter, (AO_t) value);
}
#endif
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_READ 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_READ 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(read)(ETHR_ATMC_T__ *var)
{
return (ETHR_AINT_T__) AO_load(&var->counter);
}
#ifdef AO_HAVE_load_acquire
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_READ_ACQB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_READ_ACQB 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(read_acqb)(ETHR_ATMC_T__ *var)
{
return (ETHR_AINT_T__) AO_load_acquire(&var->counter);
}
#endif
#ifdef AO_HAVE_fetch_and_add
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_ADD_RETURN 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_ADD_RETURN 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(add_return)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ incr)
{
return ((ETHR_AINT_T__) AO_fetch_and_add(&var->counter, (AO_t) incr)) + incr;
}
#endif
#ifdef AO_HAVE_fetch_and_add1
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_INC_RETURN 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_INC_RETURN 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(inc_return)(ETHR_ATMC_T__ *var)
{
return ((ETHR_AINT_T__) AO_fetch_and_add1(&var->counter)) + 1;
}
#endif
#ifdef AO_HAVE_fetch_and_add1_acquire
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_INC_RETURN_ACQB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_INC_RETURN_ACQB 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(inc_return_acqb)(ETHR_ATMC_T__ *var)
{
return ((ETHR_AINT_T__) AO_fetch_and_add1_acquire(&var->counter)) + 1;
}
#endif
#ifdef AO_HAVE_fetch_and_sub1
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_DEC_RETURN 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_DEC_RETURN 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(dec_return)(ETHR_ATMC_T__ *var)
{
return ((ETHR_AINT_T__) AO_fetch_and_sub1(&var->counter)) - 1;
}
#endif
#ifdef AO_HAVE_fetch_and_sub1_release
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_DEC_RETURN_RELB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_DEC_RETURN_RELB 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(dec_return_relb)(ETHR_ATMC_T__ *var)
{
return ((ETHR_AINT_T__) AO_fetch_and_sub1_release(&var->counter)) - 1;
}
#endif
#ifdef AO_HAVE_compare_and_swap
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_CMPXCHG 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_CMPXCHG 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(cmpxchg)(ETHR_ATMC_T__ *var,
ETHR_AINT_T__ new,
ETHR_AINT_T__ exp)
{
ETHR_AINT_T__ act;
do {
if (AO_compare_and_swap(&var->counter, (AO_t) exp, (AO_t) new))
return exp;
act = (ETHR_AINT_T__) AO_load(&var->counter);
} while (act == exp);
return act;
}
#endif
#ifdef AO_HAVE_compare_and_swap_acquire
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_CMPXCHG_ACQB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_CMPXCHG_ACQB 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(cmpxchg_acqb)(ETHR_ATMC_T__ *var,
ETHR_AINT_T__ new,
ETHR_AINT_T__ exp)
{
ETHR_AINT_T__ act;
do {
if (AO_compare_and_swap_acquire(&var->counter, (AO_t) exp, (AO_t) new))
return exp;
#ifdef AO_HAVE_load_acquire
act = (ETHR_AINT_T__) AO_load_acquire(&var->counter);
#else
act = (ETHR_AINT_T__) AO_load(&var->counter);
#endif
} while (act == exp);
#ifndef AO_HAVE_load_acquire
AO_nop_full();
#endif
return act;
}
#endif
#ifdef AO_HAVE_compare_and_swap_release
#if ETHR_SIZEOF_AO_T == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_CMPXCHG_RELB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_CMPXCHG_RELB 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(cmpxchg_relb)(ETHR_ATMC_T__ *var,
ETHR_AINT_T__ new,
ETHR_AINT_T__ exp)
{
ETHR_AINT_T__ act;
do {
if (AO_compare_and_swap_release(&var->counter, (AO_t) exp, (AO_t) new))
return exp;
act = (ETHR_AINT_T__) AO_load(&var->counter);
} while (act == exp);
return act;
}
#endif
#endif /* ETHR_TRY_INLINE_FUNCS */
#undef ETHR_NATMC_FUNC__
#undef ETHR_ATMC_T__
#undef ETHR_AINT_T__
#endif /* ETHR_LIBATOMIC_OPS_ATOMIC_H__ */
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