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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__
#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 the `void *' type.
*/
#if ETHR_SIZEOF_AO_T < ETHR_SIZEOF_PTR
#error The AO_t type is too small
#endif
#if ETHR_SIZEOF_AO_T == 4
#define ETHR_HAVE_NATIVE_ATOMIC32 1
#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_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
#if ETHR_SIZEOF_AO_T == 8
typedef union {
volatile AO_t counter;
ethr_sint32_t sint32[2];
} ETHR_ATMC_T__;
#else
typedef struct {
volatile AO_t counter;
} ETHR_ATMC_T__;
#endif
#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 AO_compiler_barrier()
#endif
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_ATOMIC_IMPL__)
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 == 8
/*
* We also need to provide an ethr_native_atomic32_addr(), since
* this 64-bit implementation will be used implementing 32-bit
* native atomics.
*/
static ETHR_INLINE ethr_sint32_t *
ethr_native_atomic32_addr(ETHR_ATMC_T__ *var)
{
ETHR_ASSERT(((void *) &var->sint32[0]) == ((void *) &var->counter));
#ifdef ETHR_BIGENDIAN
return &var->sint32[1];
#else
return &var->sint32[0];
#endif
}
#endif /* ETHR_SIZEOF_AO_T == 8 */
static ETHR_INLINE void
ETHR_NATMC_FUNC__(set)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ value)
{
AO_store(&var->counter, (AO_t) value);
}
static ETHR_INLINE void
ETHR_NATMC_FUNC__(init)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ value)
{
ETHR_NATMC_FUNC__(set)(var, value);
}
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(read)(ETHR_ATMC_T__ *var)
{
return (ETHR_AINT_T__) AO_load(&var->counter);
}
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(add_return)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ incr)
{
#ifdef AO_HAVE_fetch_and_add_full
return ((ETHR_AINT_T__) AO_fetch_and_add_full(&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_full(&var->counter, exp, new))
return (ETHR_AINT_T__) new;
}
#endif
}
static ETHR_INLINE void
ETHR_NATMC_FUNC__(add)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ incr)
{
(void) ETHR_NATMC_FUNC__(add_return)(var, incr);
}
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(inc_return)(ETHR_ATMC_T__ *var)
{
#ifdef AO_HAVE_fetch_and_add1_full
return ((ETHR_AINT_T__) AO_fetch_and_add1_full(&var->counter)) + 1;
#else
return ETHR_NATMC_FUNC__(add_return)(var, 1);
#endif
}
static ETHR_INLINE void
ETHR_NATMC_FUNC__(inc)(ETHR_ATMC_T__ *var)
{
(void) ETHR_NATMC_FUNC__(inc_return)(var);
}
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(dec_return)(ETHR_ATMC_T__ *var)
{
#ifdef AO_HAVE_fetch_and_sub1_full
return ((ETHR_AINT_T__) AO_fetch_and_sub1_full(&var->counter)) - 1;
#else
return ETHR_NATMC_FUNC__(add_return)(var, -1);
#endif
}
static ETHR_INLINE void
ETHR_NATMC_FUNC__(dec)(ETHR_ATMC_T__ *var)
{
(void) ETHR_NATMC_FUNC__(dec_return)(var);
}
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(and_retold)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ mask)
{
while (1) {
AO_t exp = AO_load(&var->counter);
AO_t new = exp & ((AO_t) mask);
if (AO_compare_and_swap_full(&var->counter, exp, new))
return (ETHR_AINT_T__) exp;
}
}
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(or_retold)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ mask)
{
while (1) {
AO_t exp = AO_load(&var->counter);
AO_t new = exp | ((AO_t) mask);
if (AO_compare_and_swap_full(&var->counter, exp, new))
return (ETHR_AINT_T__) exp;
}
}
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_full(&var->counter, (AO_t) exp, (AO_t) new))
return exp;
act = (ETHR_AINT_T__) AO_load(&var->counter);
} while (act == exp);
return act;
}
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(xchg)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ new)
{
while (1) {
AO_t exp = AO_load(&var->counter);
if (AO_compare_and_swap_full(&var->counter, exp, (AO_t) new))
return (ETHR_AINT_T__) exp;
}
}
/*
* Atomic ops with at least specified barriers.
*/
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(read_acqb)(ETHR_ATMC_T__ *var)
{
#ifdef AO_HAVE_load_acquire
return (ETHR_AINT_T__) AO_load_acquire(&var->counter);
#else
ETHR_AINT_T__ res = ETHR_NATMC_FUNC__(read)(var);
ETHR_MEMORY_BARRIER;
return res;
#endif
}
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(inc_return_acqb)(ETHR_ATMC_T__ *var)
{
#ifdef AO_HAVE_fetch_and_add1_acquire
return ((ETHR_AINT_T__) AO_fetch_and_add1_acquire(&var->counter)) + 1;
#else
ETHR_AINT_T__ res = ETHR_NATMC_FUNC__(add_return)(var, 1);
return res;
#endif
}
static ETHR_INLINE void
ETHR_NATMC_FUNC__(set_relb)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ value)
{
#ifdef AO_HAVE_store_release
AO_store_release(&var->counter, (AO_t) value);
#else
ETHR_MEMORY_BARRIER;
ETHR_NATMC_FUNC__(set)(var, value);
#endif
}
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(dec_return_relb)(ETHR_ATMC_T__ *var)
{
#ifdef AO_HAVE_fetch_and_sub1_release
return ((ETHR_AINT_T__) AO_fetch_and_sub1_release(&var->counter)) - 1;
#else
return ETHR_NATMC_FUNC__(dec_return)(var);
#endif
}
static ETHR_INLINE void
ETHR_NATMC_FUNC__(dec_relb)(ETHR_ATMC_T__ *var)
{
(void) ETHR_NATMC_FUNC__(dec_return_relb)(var);
}
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(cmpxchg_acqb)(ETHR_ATMC_T__ *var,
ETHR_AINT_T__ new,
ETHR_AINT_T__ exp)
{
#ifdef AO_HAVE_compare_and_swap_acquire
ETHR_AINT_T__ act;
do {
if (AO_compare_and_swap_acquire(&var->counter, (AO_t) exp, (AO_t) new))
return exp;
act = (ETHR_AINT_T__) AO_load(&var->counter);
} while (act == exp);
AO_nop_full();
return act;
#else
ETHR_AINT_T__ act = ETHR_NATMC_FUNC__(cmpxchg)(var, new, exp);
return act;
#endif
}
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(cmpxchg_relb)(ETHR_ATMC_T__ *var,
ETHR_AINT_T__ new,
ETHR_AINT_T__ exp)
{
#ifdef AO_HAVE_compare_and_swap_release
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;
#else
return ETHR_NATMC_FUNC__(cmpxchg)(var, new, exp);
#endif
}
#endif /* ETHR_TRY_INLINE_FUNCS */
#undef ETHR_NATMC_FUNC__
#undef ETHR_ATMC_T__
#undef ETHR_AINT_T__
#endif /* !defined(ETHR_HAVE_NATIVE_ATOMICS) && defined(ETHR_HAVE_LIBATOMIC_OPS) */
#endif /* ETHR_LIBATOMIC_OPS_ATOMIC_H__ */
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