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cpython/Python/thread_beos.h at 2.7 · python-emscripten/cpython · GitHub
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#include
<kernel/OS.h>
#include
<support/SupportDefs.h>
#include
<errno.h>
/* ----------------------------------------------------------------------
* Fast locking mechanism described by Benoit Schillings (benoit@be.com)
* in the Be Developer's Newsletter, Issue #26 (http://www.be.com/).
*/
typedef
struct
benaphore
{
sem_id
_sem
;
int32
_atom
;
}
benaphore_t
;
static
status_t
benaphore_create
(
const
char
*
name
,
benaphore_t
*
ben
);
static
status_t
benaphore_destroy
(
benaphore_t
*
ben
);
static
status_t
benaphore_lock
(
benaphore_t
*
ben
);
static
status_t
benaphore_timedlock
(
benaphore_t
*
ben
,
bigtime_t
micros
);
static
status_t
benaphore_unlock
(
benaphore_t
*
ben
);
static
status_t
benaphore_create
(
const
char
*
name
,
benaphore_t
*
ben
)
{
if
(
ben
!=
NULL
) {
ben
->
_atom
=
0
;
ben
->
_sem
=
create_sem
(
0
,
name
);
if
(
ben
->
_sem
<
B_NO_ERROR
) {
return
B_BAD_SEM_ID
;
}
}
else
{
return
EFAULT
;
}
return
EOK
;
}
static
status_t
benaphore_destroy
(
benaphore_t
*
ben
)
{
if
(
ben
->
_sem
>=
B_NO_ERROR
) {
status_t
retval
=
benaphore_timedlock
(
ben
,
0
);
if
(
retval
==
EOK
||
retval
==
EWOULDBLOCK
) {
status_t
del_retval
=
delete_sem
(
ben
->
_sem
);
return
del_retval
;
}
}
return
B_BAD_SEM_ID
;
}
static
status_t
benaphore_lock
(
benaphore_t
*
ben
)
{
int32
prev
=
atomic_add
(
&
(
ben
->
_atom
),
1
);
if
(
prev
>
0
) {
return
acquire_sem
(
ben
->
_sem
);
}
return
EOK
;
}
static
status_t
benaphore_timedlock
(
benaphore_t
*
ben
,
bigtime_t
micros
)
{
int32
prev
=
atomic_add
(
&
(
ben
->
_atom
),
1
);
if
(
prev
>
0
) {
status_t
retval
=
acquire_sem_etc
(
ben
->
_sem
,
1
,
B_TIMEOUT
,
micros
);
switch
(
retval
) {
case
B_WOULD_BLOCK
:
/* Fall through... */
case
B_TIMED_OUT
:
return
EWOULDBLOCK
;
break
;
case
B_OK
:
return
EOK
;
break
;
default
:
return
retval
;
break
;
}
}
return
EOK
;
}
static
status_t
benaphore_unlock
(
benaphore_t
*
ben
)
{
int32
prev
=
atomic_add
(
&
(
ben
->
_atom
),
-1
);
if
(
prev
>
1
) {
return
release_sem
(
ben
->
_sem
);
}
return
EOK
;
}
/* ----------------------------------------------------------------------
* Initialization.
*/
static
void
PyThread__init_thread
(
void
)
{
/* Do nothing. */
return
;
}
/* ----------------------------------------------------------------------
* Thread support.
*
* Only ANSI C, renamed functions here; you can't use K&R on BeOS,
* and there's no legacy thread module to support.
*/
static
int32
thread_count
=
0
;
long
PyThread_start_new_thread
(
void
(
*
func
)(
void
*
),
void
*
arg
)
{
status_t
success
=
0
;
thread_id
tid
;
char
name
[
B_OS_NAME_LENGTH
];
int32
this_thread
;
dprintf
((
"PyThread_start_new_thread called\n"
));
/* We are so very thread-safe... */
this_thread
=
atomic_add
(
&
thread_count
,
1
);
PyOS_snprintf
(
name
,
sizeof
(
name
),
"python thread (%d)"
,
this_thread
);
tid
=
spawn_thread
( (
thread_func
)
func
,
name
,
B_NORMAL_PRIORITY
,
arg
);
if
(
tid
>
B_NO_ERROR
) {
success
=
resume_thread
(
tid
);
}
return
(
success
==
B_NO_ERROR
?
tid
:
-1
);
}
long
PyThread_get_thread_ident
(
void
)
{
/* Presumed to return the current thread's ID... */
thread_id
tid
;
tid
=
find_thread
(
NULL
);
return
(
tid
!=
B_NAME_NOT_FOUND
?
tid
:
-1
);
}
void
PyThread_exit_thread
(
void
)
{
int32
threads
;
dprintf
((
"PyThread_exit_thread called\n"
));
/* Thread-safe way to read a variable without a mutex: */
threads
=
atomic_add
(
&
thread_count
,
0
);
if
(
threads
==
0
) {
/* No threads around, so exit main(). */
exit
(
0
);
}
else
{
/* Oh, we're a thread, let's try to exit gracefully... */
exit_thread
(
B_NO_ERROR
);
}
}
/* ----------------------------------------------------------------------
* Lock support.
*/
static
int32
lock_count
=
0
;
PyThread_type_lock
PyThread_allocate_lock
(
void
)
{
benaphore_t
*
lock
;
status_t
retval
;
char
name
[
B_OS_NAME_LENGTH
];
int32
this_lock
;
dprintf
((
"PyThread_allocate_lock called\n"
));
lock
=
(
benaphore_t
*
)
malloc
(
sizeof
(
benaphore_t
) );
if
(
lock
==
NULL
) {
/* TODO: that's bad, raise MemoryError */
return
(
PyThread_type_lock
)
NULL
;
}
this_lock
=
atomic_add
(
&
lock_count
,
1
);
PyOS_snprintf
(
name
,
sizeof
(
name
),
"python lock (%d)"
,
this_lock
);
retval
=
benaphore_create
(
name
,
lock
);
if
(
retval
!=
EOK
) {
/* TODO: that's bad, raise an exception */
return
(
PyThread_type_lock
)
NULL
;
}
dprintf
((
"PyThread_allocate_lock() -> %p\n"
,
lock
));
return
(
PyThread_type_lock
)
lock
;
}
void
PyThread_free_lock
(
PyThread_type_lock
lock
)
{
status_t
retval
;
dprintf
((
"PyThread_free_lock(%p) called\n"
,
lock
));
retval
=
benaphore_destroy
( (
benaphore_t
*
)
lock
);
if
(
retval
!=
EOK
) {
/* TODO: that's bad, raise an exception */
return
;
}
}
int
PyThread_acquire_lock
(
PyThread_type_lock
lock
,
int
waitflag
)
{
int
success
;
status_t
retval
;
dprintf
((
"PyThread_acquire_lock(%p, %d) called\n"
,
lock
,
waitflag
));
if
(
waitflag
) {
retval
=
benaphore_lock
( (
benaphore_t
*
)
lock
);
}
else
{
retval
=
benaphore_timedlock
( (
benaphore_t
*
)
lock
,
0
);
}
if
(
retval
==
EOK
) {
success
=
1
;
}
else
{
success
=
0
;
/* TODO: that's bad, raise an exception */
}
dprintf
((
"PyThread_acquire_lock(%p, %d) -> %d\n"
,
lock
,
waitflag
,
success
));
return
success
;
}
void
PyThread_release_lock
(
PyThread_type_lock
lock
)
{
status_t
retval
;
dprintf
((
"PyThread_release_lock(%p) called\n"
,
lock
));
retval
=
benaphore_unlock
( (
benaphore_t
*
)
lock
);
if
(
retval
!=
EOK
) {
/* TODO: that's bad, raise an exception */
return
;
}
}
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