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#ifndef
Py_LIMITED_API
#ifndef
Py_ATOMIC_H
#define
Py_ATOMIC_H
/* XXX: When compilers start offering a stdatomic.h with lock-free
atomic_int and atomic_address types, include that here and rewrite
the atomic operations in terms of it. */
#include
"dynamic_annotations.h"
#ifdef
__cplusplus
extern
"C"
{
#endif
/* This is modeled after the atomics interface from C1x, according to
* the draft at
* http://www.open-std.org/JTC1/SC22/wg14/www/docs/n1425.pdf.
* Operations and types are named the same except with a _Py_ prefix
* and have the same semantics.
*
* Beware, the implementations here are deep magic.
*/
typedef
enum
_Py_memory_order
{
_Py_memory_order_relaxed
,
_Py_memory_order_acquire
,
_Py_memory_order_release
,
_Py_memory_order_acq_rel
,
_Py_memory_order_seq_cst
}
_Py_memory_order
;
typedef
struct
_Py_atomic_address
{
void
*
_value
;
}
_Py_atomic_address
;
typedef
struct
_Py_atomic_int
{
int
_value
;
}
_Py_atomic_int
;
/* Only support GCC (for expression statements) and x86 (for simple
* atomic semantics) for now */
#if
defined(
__GNUC__
)
&&
(defined(
__i386__
)
||
defined(
__amd64
))
static
__inline__
void
_Py_atomic_signal_fence
(
_Py_memory_order
order
)
{
if
(
order
!=
_Py_memory_order_relaxed
)
__asm__
volatile
(
""
:::
"memory"
);
}
static
__inline__
void
_Py_atomic_thread_fence
(
_Py_memory_order
order
)
{
if
(
order
!=
_Py_memory_order_relaxed
)
__asm__
volatile
(
"mfence"
:::
"memory"
);
}
/* Tell the race checker about this operation's effects. */
static
__inline__
void
_Py_ANNOTATE_MEMORY_ORDER
(
const
volatile
void
*
address
,
_Py_memory_order
order
)
{
(
void
)
address
;
/* shut up -Wunused-parameter */
switch
(
order
) {
case
_Py_memory_order_release
:
case
_Py_memory_order_acq_rel
:
case
_Py_memory_order_seq_cst
:
_Py_ANNOTATE_HAPPENS_BEFORE
(
address
);
break
;
case
_Py_memory_order_relaxed
:
case
_Py_memory_order_acquire
:
break
;
}
switch
(
order
) {
case
_Py_memory_order_acquire
:
case
_Py_memory_order_acq_rel
:
case
_Py_memory_order_seq_cst
:
_Py_ANNOTATE_HAPPENS_AFTER
(
address
);
break
;
case
_Py_memory_order_relaxed
:
case
_Py_memory_order_release
:
break
;
}
}
#define
_Py_atomic_store_explicit
(
ATOMIC_VAL
,
NEW_VAL
,
ORDER
) \
__extension__ ({ \
__typeof__(ATOMIC_VAL) atomic_val = ATOMIC_VAL; \
__typeof__(atomic_val->_value) new_val = NEW_VAL;\
volatile __typeof__(new_val) *volatile_data = &atomic_val->_value; \
_Py_memory_order order = ORDER; \
_Py_ANNOTATE_MEMORY_ORDER(atomic_val, order); \
\
/* Perform the operation. */
\
_Py_ANNOTATE_IGNORE_WRITES_BEGIN
(); \
switch
(
order
) { \
case
_Py_memory_order_release
: \
_Py_atomic_signal_fence
(
_Py_memory_order_release
); \
/* fallthrough */
\
case
_Py_memory_order_relaxed
: \
*
volatile_data
=
new_val
; \
break
; \
\
case
_Py_memory_order_acquire
: \
case
_Py_memory_order_acq_rel
: \
case
_Py_memory_order_seq_cst
: \
__asm__
volatile
(
"xchg %0, %1"
\
:
"+r"
(
new_val
) \
:
"m"
(
atomic_val
->
_value
) \
:
"memory"
); \
break
; \
} \
_Py_ANNOTATE_IGNORE_WRITES_END
(); \
})
#define
_Py_atomic_load_explicit
(
ATOMIC_VAL
,
ORDER
) \
__extension__ ({ \
__typeof__(ATOMIC_VAL) atomic_val = ATOMIC_VAL; \
__typeof__(atomic_val->_value) result; \
volatile __typeof__(result) *volatile_data = &atomic_val->_value; \
_Py_memory_order order = ORDER; \
_Py_ANNOTATE_MEMORY_ORDER(atomic_val, order); \
\
/* Perform the operation. */
\
_Py_ANNOTATE_IGNORE_READS_BEGIN
(); \
switch
(
order
) { \
case
_Py_memory_order_release
: \
case
_Py_memory_order_acq_rel
: \
case
_Py_memory_order_seq_cst
: \
/* Loads on x86 are not releases by default, so need a */
\
/* thread fence. */
\
_Py_atomic_thread_fence
(
_Py_memory_order_release
); \
break
; \
default
: \
/* No fence */
\
break
; \
} \
result
=
*
volatile_data
; \
switch
(
order
) { \
case
_Py_memory_order_acquire
: \
case
_Py_memory_order_acq_rel
: \
case
_Py_memory_order_seq_cst
: \
/* Loads on x86 are automatically acquire operations so */
\
/* can get by with just a compiler fence. */
\
_Py_atomic_signal_fence
(
_Py_memory_order_acquire
); \
break
; \
default
: \
/* No fence */
\
break
; \
} \
_Py_ANNOTATE_IGNORE_READS_END
(); \
result
; \
})
#else
/* !gcc x86 */
/* Fall back to other compilers and processors by assuming that simple
volatile accesses are atomic. This is false, so people should port
this. */
#define
_Py_atomic_signal_fence
(
/*memory_order*/
ORDER
) ((void)0)
#define
_Py_atomic_thread_fence
(
/*memory_order*/
ORDER
) ((void)0)
#define
_Py_atomic_store_explicit
(
ATOMIC_VAL
,
NEW_VAL
,
ORDER
) \
((ATOMIC_VAL)->_value = NEW_VAL)
#define
_Py_atomic_load_explicit
(
ATOMIC_VAL
,
ORDER
) \
((ATOMIC_VAL)->_value)
#endif
/* !gcc x86 */
/* Standardized shortcuts. */
#define
_Py_atomic_store
(
ATOMIC_VAL
,
NEW_VAL
) \
_Py_atomic_store_explicit(ATOMIC_VAL, NEW_VAL, _Py_memory_order_seq_cst)
#define
_Py_atomic_load
(
ATOMIC_VAL
) \
_Py_atomic_load_explicit(ATOMIC_VAL, _Py_memory_order_seq_cst)
/* Python-local extensions */
#define
_Py_atomic_store_relaxed
(
ATOMIC_VAL
,
NEW_VAL
) \
_Py_atomic_store_explicit(ATOMIC_VAL, NEW_VAL, _Py_memory_order_relaxed)
#define
_Py_atomic_load_relaxed
(
ATOMIC_VAL
) \
_Py_atomic_load_explicit(ATOMIC_VAL, _Py_memory_order_relaxed)
#ifdef
__cplusplus
}
#endif
#endif
/* Py_ATOMIC_H */
#endif
/* Py_LIMITED_API */
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