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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2011-2015. 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 double word atomics using gcc's __atomic
* and __sync builtins
* Author: Rickard Green
*
* Note: The C11 memory model implemented by gcc's __atomic
* builtins does not match the ethread API very well.
*
* Due to this we cannot use the __ATOMIC_SEQ_CST
* memory model. For more information see the comment
* in the begining of ethr_membar.h in this directory.
*/
#undef ETHR_INCLUDE_DW_ATOMIC_IMPL__
#if !defined(ETHR_GCC_ATOMIC_DW_ATOMIC_H__) \
&& ((ETHR_HAVE___sync_val_compare_and_swap & (2*ETHR_SIZEOF_PTR)) \
|| (ETHR_HAVE___atomic_compare_exchange_n & (2*ETHR_SIZEOF_PTR)))
# define ETHR_GCC_ATOMIC_DW_ATOMIC_H__
# define ETHR_INCLUDE_DW_ATOMIC_IMPL__
#endif
#ifdef ETHR_INCLUDE_DW_ATOMIC_IMPL__
# define ETHR_HAVE_NATIVE_SU_DW_ATOMIC
#if ((ETHR_HAVE___sync_val_compare_and_swap & (2*ETHR_SIZEOF_PTR)) \
&& (ETHR_HAVE___atomic_compare_exchange_n & (2*ETHR_SIZEOF_PTR)))
# define ETHR_NATIVE_DW_ATOMIC_IMPL "gcc_atomic_and_sync_builtins"
#elif (ETHR_HAVE___atomic_compare_exchange_n & (2*ETHR_SIZEOF_PTR))
# define ETHR_NATIVE_DW_ATOMIC_IMPL "gcc_atomic_builtins"
#elif (ETHR_HAVE___sync_val_compare_and_swap & (2*ETHR_SIZEOF_PTR))
# define ETHR_NATIVE_DW_ATOMIC_IMPL "gcc_sync_builtins"
#else
# error "!?"
#endif
# if ETHR_SIZEOF_PTR == 4
# define ETHR_DW_NATMC_ALIGN_MASK__ 0x7
# define ETHR_NATIVE_SU_DW_SINT_T ethr_sint64_t
# elif ETHR_SIZEOF_PTR == 8
# define ETHR_DW_NATMC_ALIGN_MASK__ 0xf
# define ETHR_NATIVE_SU_DW_SINT_T ethr_sint128_t
# endif
typedef volatile ETHR_NATIVE_SU_DW_SINT_T * ethr_native_dw_ptr_t;
/*
* We need 16 byte aligned memory in 64-bit mode, and 8 byte aligned
* memory in 32-bit mode. 16 byte aligned malloc in 64-bit mode is
* not common, and at least some glibc malloc implementations
* only 4 byte align in 32-bit mode.
*
* This code assumes 8 byte aligned memory in 64-bit mode, and 4 byte
* aligned memory in 32-bit mode. A malloc implementation that does
* not adhere to these alignment requirements is seriously broken,
* and we wont bother trying to work around it.
*
* Since memory alignment may be off by one word we need to align at
* runtime. We, therefore, need an extra word allocated.
*/
#define ETHR_DW_NATMC_MEM__(VAR) \
(&var->c[(int) ((ethr_uint_t) &(VAR)->c[0]) & ETHR_DW_NATMC_ALIGN_MASK__])
typedef union {
volatile ETHR_NATIVE_SU_DW_SINT_T dw_sint;
volatile ethr_sint_t sint[3];
volatile char c[ETHR_SIZEOF_PTR*3];
} ethr_native_dw_atomic_t;
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_ATOMIC_IMPL__)
# ifdef ETHR_DEBUG
# define ETHR_DW_DBG_ALIGNED__(PTR) \
ETHR_ASSERT((((ethr_uint_t) (PTR)) & ETHR_DW_NATMC_ALIGN_MASK__) == 0);
# else
# define ETHR_DW_DBG_ALIGNED__(PTR)
# endif
#define ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_ADDR 1
static ETHR_INLINE ethr_sint_t *
ethr_native_dw_atomic_addr(ethr_native_dw_atomic_t *var)
{
return (ethr_sint_t *) ETHR_DW_NATMC_MEM__(var);
}
#if (ETHR_HAVE___atomic_store_n & (2*ETHR_SIZEOF_PTR))
#if (ETHR_GCC_RELAXED_VERSIONS__ & (2*ETHR_SIZEOF_PTR))
#define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_SET 1
static ETHR_INLINE void
ethr_native_su_dw_atomic_set(ethr_native_dw_atomic_t *var,
ETHR_NATIVE_SU_DW_SINT_T value)
{
ethr_native_dw_ptr_t p = (ethr_native_dw_ptr_t) ETHR_DW_NATMC_MEM__(var);
ETHR_DW_DBG_ALIGNED__(p);
__atomic_store_n(p, value, __ATOMIC_RELAXED);
}
#endif /* ETHR_GCC_RELAXED_VERSIONS__ */
#if (ETHR_GCC_RELB_VERSIONS__ & (2*ETHR_SIZEOF_PTR))
#define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_SET_RELB 1
static ETHR_INLINE void
ethr_native_su_dw_atomic_set_relb(ethr_native_dw_atomic_t *var,
ETHR_NATIVE_SU_DW_SINT_T value)
{
ethr_native_dw_ptr_t p = (ethr_native_dw_ptr_t) ETHR_DW_NATMC_MEM__(var);
ETHR_DW_DBG_ALIGNED__(p);
__atomic_store_n(p, value, __ATOMIC_RELEASE);
}
#endif /* ETHR_GCC_RELB_VERSIONS__ */
#endif /* ETHR_HAVE___atomic_store_n */
#if (ETHR_HAVE___atomic_load_n & (2*ETHR_SIZEOF_PTR))
#if (ETHR_GCC_RELAXED_VERSIONS__ & (2*ETHR_SIZEOF_PTR))
#define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_READ 1
static ETHR_INLINE ETHR_NATIVE_SU_DW_SINT_T
ethr_native_su_dw_atomic_read(ethr_native_dw_atomic_t *var)
{
ethr_native_dw_ptr_t p = (ethr_native_dw_ptr_t) ETHR_DW_NATMC_MEM__(var);
ETHR_DW_DBG_ALIGNED__(p);
return __atomic_load_n(p, __ATOMIC_RELAXED);
}
#endif /* ETHR_GCC_RELAXED_VERSIONS__ */
#if ((ETHR_GCC_ACQB_VERSIONS__ & (2*ETHR_SIZEOF_PTR)) \
& ~ETHR___atomic_load_ACQUIRE_barrier_bug)
#define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_READ_ACQB 1
static ETHR_INLINE ETHR_NATIVE_SU_DW_SINT_T
ethr_native_su_dw_atomic_read_acqb(ethr_native_dw_atomic_t *var)
{
ethr_native_dw_ptr_t p = (ethr_native_dw_ptr_t) ETHR_DW_NATMC_MEM__(var);
ETHR_DW_DBG_ALIGNED__(p);
return __atomic_load_n(p, __ATOMIC_ACQUIRE);
}
#endif /* ETHR_GCC_ACQB_VERSIONS__ */
#endif /* ETHR_HAVE___atomic_load_n */
#if (ETHR_HAVE___atomic_compare_exchange_n & (2*ETHR_SIZEOF_PTR))
#if (ETHR_GCC_RELAXED_MOD_VERSIONS__ & (2*ETHR_SIZEOF_PTR))
#define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_CMPXCHG 1
static ETHR_INLINE ETHR_NATIVE_SU_DW_SINT_T
ethr_native_su_dw_atomic_cmpxchg(ethr_native_dw_atomic_t *var,
ETHR_NATIVE_SU_DW_SINT_T new,
ETHR_NATIVE_SU_DW_SINT_T exp)
{
ethr_native_dw_ptr_t p = (ethr_native_dw_ptr_t) ETHR_DW_NATMC_MEM__(var);
ETHR_NATIVE_SU_DW_SINT_T xchg = exp;
ETHR_DW_DBG_ALIGNED__(p);
if (__atomic_compare_exchange_n(p,
&xchg,
new,
0,
__ATOMIC_RELAXED,
__ATOMIC_RELAXED))
return exp;
return xchg;
}
#endif /* ETHR_GCC_RELAXED_MOD_VERSIONS__ */
#if (ETHR_GCC_ACQB_MOD_VERSIONS__ & (2*ETHR_SIZEOF_PTR))
#define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_CMPXCHG_ACQB 1
static ETHR_INLINE ETHR_NATIVE_SU_DW_SINT_T
ethr_native_su_dw_atomic_cmpxchg_acqb(ethr_native_dw_atomic_t *var,
ETHR_NATIVE_SU_DW_SINT_T new,
ETHR_NATIVE_SU_DW_SINT_T exp)
{
ethr_native_dw_ptr_t p = (ethr_native_dw_ptr_t) ETHR_DW_NATMC_MEM__(var);
ETHR_NATIVE_SU_DW_SINT_T xchg = exp;
ETHR_DW_DBG_ALIGNED__(p);
if (__atomic_compare_exchange_n(p,
&xchg,
new,
0,
__ATOMIC_ACQUIRE,
__ATOMIC_ACQUIRE))
return exp;
return xchg;
}
#endif /* ETHR_GCC_ACQB_MOD_VERSIONS__ */
#endif /* ETHR_HAVE___atomic_compare_exchange_n */
#if ((ETHR_HAVE___sync_val_compare_and_swap & (2*ETHR_SIZEOF_PTR)) \
& ETHR_GCC_MB_MOD_VERSIONS__)
#define ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC_CMPXCHG_MB 1
static ETHR_INLINE ETHR_NATIVE_SU_DW_SINT_T
ethr_native_su_dw_atomic_cmpxchg_mb(ethr_native_dw_atomic_t *var,
ETHR_NATIVE_SU_DW_SINT_T new,
ETHR_NATIVE_SU_DW_SINT_T old)
{
ethr_native_dw_ptr_t p = (ethr_native_dw_ptr_t) ETHR_DW_NATMC_MEM__(var);
ETHR_DW_DBG_ALIGNED__(p);
return __sync_val_compare_and_swap(p, old, new);
}
#endif /* ETHR_HAVE___sync_val_compare_and_swap */
#endif /* ETHR_TRY_INLINE_FUNCS */
#endif /* ETHR_INCLUDE_DW_ATOMIC_IMPL__ */
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