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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2010. 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__
#if !defined(ETHR_HAVE_NATIVE_ATOMICS) && defined(ETHR_HAVE_LIBATOMIC_OPS)
#define ETHR_HAVE_NATIVE_ATOMICS 1
#if (defined(__i386__) && !defined(ETHR_PRE_PENTIUM4_COMPAT)) \
|| defined(__x86_64__)
#define AO_USE_PENTIUM4_INSTRS
#endif
#include "atomic_ops.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()
*
* The `AO_t' type also have to be at least as large as
* `void *' and `long' types.
*/
#if ETHR_SIZEOF_AO_T < ETHR_SIZEOF_PTR
#error The AO_t type is too small
#endif
typedef struct {
volatile AO_t counter;
} ethr_native_atomic_t;
#define ETHR_MEMORY_BARRIER AO_nop_full()
#ifdef AO_HAVE_nop_write
# define ETHR_WRITE_MEMORY_BARRIER AO_nop_write()
#else
# define ETHR_WRITE_MEMORY_BARRIER ETHR_MEMORY_BARRIER
#endif
#ifdef AO_HAVE_nop_read
# define ETHR_READ_MEMORY_BARRIER AO_nop_read()
#else
# define ETHR_READ_MEMORY_BARRIER ETHR_MEMORY_BARRIER
#endif
#ifdef AO_NO_DD_ORDERING
# define ETHR_READ_DEPEND_MEMORY_BARRIER ETHR_READ_MEMORY_BARRIER
#else
# define ETHR_READ_DEPEND_MEMORY_BARRIER __asm__ __volatile__("":::"memory")
#endif
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_AUX_IMPL__)
static ETHR_INLINE void
ethr_native_atomic_set(ethr_native_atomic_t *var, long value)
{
AO_store(&var->counter, (AO_t) value);
}
static ETHR_INLINE void
ethr_native_atomic_init(ethr_native_atomic_t *var, long value)
{
ethr_native_atomic_set(var, value);
}
static ETHR_INLINE long
ethr_native_atomic_read(ethr_native_atomic_t *var)
{
return (long) AO_load(&var->counter);
}
static ETHR_INLINE long
ethr_native_atomic_add_return(ethr_native_atomic_t *var, long incr)
{
#ifdef AO_HAVE_fetch_and_add
return ((long) AO_fetch_and_add(&var->counter, (AO_t) incr)) + incr;
#else
while (1) {
AO_t exp = AO_load(&var->counter);
AO_t new = exp + (AO_t) incr;
if (AO_compare_and_swap(&var->counter, exp, new))
return (long) new;
}
#endif
}
static ETHR_INLINE void
ethr_native_atomic_add(ethr_native_atomic_t *var, long incr)
{
(void) ethr_native_atomic_add_return(var, incr);
}
static ETHR_INLINE long
ethr_native_atomic_inc_return(ethr_native_atomic_t *var)
{
#ifdef AO_HAVE_fetch_and_add1
return ((long) AO_fetch_and_add1(&var->counter)) + 1;
#else
return ethr_native_atomic_add_return(var, 1);
#endif
}
static ETHR_INLINE void
ethr_native_atomic_inc(ethr_native_atomic_t *var)
{
(void) ethr_native_atomic_inc_return(var);
}
static ETHR_INLINE long
ethr_native_atomic_dec_return(ethr_native_atomic_t *var)
{
#ifdef AO_HAVE_fetch_and_sub1
return ((long) AO_fetch_and_sub1(&var->counter)) - 1;
#else
return ethr_native_atomic_add_return(var, -1);
#endif
}
static ETHR_INLINE void
ethr_native_atomic_dec(ethr_native_atomic_t *var)
{
(void) ethr_native_atomic_dec_return(var);
}
static ETHR_INLINE long
ethr_native_atomic_and_retold(ethr_native_atomic_t *var, long mask)
{
while (1) {
AO_t exp = AO_load(&var->counter);
AO_t new = exp & ((AO_t) mask);
if (AO_compare_and_swap(&var->counter, exp, new))
return (long) exp;
}
}
static ETHR_INLINE long
ethr_native_atomic_or_retold(ethr_native_atomic_t *var, long mask)
{
while (1) {
AO_t exp = AO_load(&var->counter);
AO_t new = exp | ((AO_t) mask);
if (AO_compare_and_swap(&var->counter, exp, new))
return (long) exp;
}
}
static ETHR_INLINE long
ethr_native_atomic_cmpxchg(ethr_native_atomic_t *var, long new, long exp)
{
long act;
do {
if (AO_compare_and_swap(&var->counter, (AO_t) exp, (AO_t) new))
return exp;
act = (long) AO_load(&var->counter);
} while (act == exp);
return act;
}
static ETHR_INLINE long
ethr_native_atomic_xchg(ethr_native_atomic_t *var, long new)
{
while (1) {
AO_t exp = AO_load(&var->counter);
if (AO_compare_and_swap(&var->counter, exp, (AO_t) new))
return (long) exp;
}
}
/*
* Atomic ops with at least specified barriers.
*/
static ETHR_INLINE long
ethr_native_atomic_read_acqb(ethr_native_atomic_t *var)
{
#ifdef AO_HAVE_load_acquire
return (long) AO_load_acquire(&var->counter);
#else
long res = ethr_native_atomic_read(var);
ETHR_MEMORY_BARRIER;
return res;
#endif
}
static ETHR_INLINE long
ethr_native_atomic_inc_return_acqb(ethr_native_atomic_t *var)
{
#ifdef AO_HAVE_fetch_and_add1_acquire
return ((long) AO_fetch_and_add1_acquire(&var->counter)) + 1;
#else
long res = ethr_native_atomic_add_return(var, 1);
ETHR_MEMORY_BARRIER;
return res;
#endif
}
static ETHR_INLINE void
ethr_native_atomic_set_relb(ethr_native_atomic_t *var, long value)
{
#ifdef AO_HAVE_store_release
AO_store_release(&var->counter, (AO_t) value);
#else
ETHR_MEMORY_BARRIER;
ethr_native_atomic_set(var, value);
#endif
}
static ETHR_INLINE long
ethr_native_atomic_dec_return_relb(ethr_native_atomic_t *var)
{
#ifdef AO_HAVE_fetch_and_sub1_release
return ((long) AO_fetch_and_sub1_release(&var->counter)) - 1;
#else
ETHR_MEMORY_BARRIER;
return ethr_native_atomic_dec_return(var);
#endif
}
static ETHR_INLINE void
ethr_native_atomic_dec_relb(ethr_native_atomic_t *var)
{
(void) ethr_native_atomic_dec_return_relb(var);
}
static ETHR_INLINE long
ethr_native_atomic_cmpxchg_acqb(ethr_native_atomic_t *var, long new, long exp)
{
#ifdef AO_HAVE_compare_and_swap_acquire
long act;
do {
if (AO_compare_and_swap_acquire(&var->counter, (AO_t) exp, (AO_t) new))
return exp;
act = (long) AO_load(&var->counter);
} while (act == exp);
AO_nop_full();
return act;
#else
long act = ethr_native_atomic_cmpxchg(var, new, exp);
ETHR_MEMORY_BARRIER;
return act;
#endif
}
static ETHR_INLINE long
ethr_native_atomic_cmpxchg_relb(ethr_native_atomic_t *var, long new, long exp)
{
#ifdef AO_HAVE_compare_and_swap_release
long act;
do {
if (AO_compare_and_swap_release(&var->counter, (AO_t) exp, (AO_t) new))
return exp;
act = (long) AO_load(&var->counter);
} while (act == exp);
return act;
#else
ETHR_MEMORY_BARRIER;
return ethr_native_atomic_cmpxchg(var, new, exp);
#endif
}
#endif
#endif
#endif
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