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python/Python/thread_atheos.h at master · java66liu/python · GitHub
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/* Threading for AtheOS.
Based on thread_beos.h. */
#include
<atheos/threads.h>
#include
<atheos/semaphore.h>
#include
<atheos/atomic.h>
#include
<errno.h>
#include
<string.h>
/* Missing decl from threads.h */
extern
int
exit_thread
(
int
);
/* Undefine FASTLOCK to play with simple semaphores. */
#define
FASTLOCK
#ifdef
FASTLOCK
/* Use an atomic counter and a semaphore for maximum speed. */
typedef
struct
fastmutex
{
sem_id
sem
;
atomic_t
count
;
}
fastmutex_t
;
static
int
fastmutex_create
(
const
char
*
name
,
fastmutex_t
*
mutex
);
static
int
fastmutex_destroy
(
fastmutex_t
*
mutex
);
static
int
fastmutex_lock
(
fastmutex_t
*
mutex
);
static
int
fastmutex_timedlock
(
fastmutex_t
*
mutex
,
bigtime_t
timeout
);
static
int
fastmutex_unlock
(
fastmutex_t
*
mutex
);
static
int
fastmutex_create
(
const
char
*
name
,
fastmutex_t
*
mutex
)
{
mutex
->
count
=
0
;
mutex
->
sem
=
create_semaphore
(
name
,
0
,
0
);
return
(
mutex
->
sem
<
0
) ?
-1
:
0
;
}
static
int
fastmutex_destroy
(
fastmutex_t
*
mutex
)
{
if
(
fastmutex_timedlock
(
mutex
,
0
)
==
0
||
errno
==
EWOULDBLOCK
) {
return
delete_semaphore
(
mutex
->
sem
);
}
return
0
;
}
static
int
fastmutex_lock
(
fastmutex_t
*
mutex
)
{
atomic_t
prev
=
atomic_add
(
&
mutex
->
count
,
1
);
if
(
prev
>
0
)
return
lock_semaphore
(
mutex
->
sem
);
return
0
;
}
static
int
fastmutex_timedlock
(
fastmutex_t
*
mutex
,
bigtime_t
timeout
)
{
atomic_t
prev
=
atomic_add
(
&
mutex
->
count
,
1
);
if
(
prev
>
0
)
return
lock_semaphore_x
(
mutex
->
sem
,
1
,
0
,
timeout
);
return
0
;
}
static
int
fastmutex_unlock
(
fastmutex_t
*
mutex
)
{
atomic_t
prev
=
atomic_add
(
&
mutex
->
count
,
-1
);
if
(
prev
>
1
)
return
unlock_semaphore
(
mutex
->
sem
);
return
0
;
}
#endif
/* FASTLOCK */
/*
* Initialization.
*
*/
static
void
PyThread__init_thread
(
void
)
{
/* Do nothing. */
return
;
}
/*
* Thread support.
*
*/
static
atomic_t
thread_count
=
0
;
long
PyThread_start_new_thread
(
void
(
*
func
) (
void
*
),
void
*
arg
)
{
status_t
success
=
-1
;
thread_id
tid
;
char
name
[
OS_NAME_LENGTH
];
atomic_t
this_thread
;
dprintf
((
"PyThread_start_new_thread called\n"
));
this_thread
=
atomic_add
(
&
thread_count
,
1
);
PyOS_snprintf
(
name
,
sizeof
(
name
),
"python thread (%d)"
,
this_thread
);
tid
=
spawn_thread
(
name
,
func
,
NORMAL_PRIORITY
,
0
,
arg
);
if
(
tid
<
0
) {
dprintf
((
"PyThread_start_new_thread spawn_thread failed: %s\n"
,
strerror
(
errno
)));
}
else
{
success
=
resume_thread
(
tid
);
if
(
success
<
0
) {
dprintf
((
"PyThread_start_new_thread resume_thread failed: %s\n"
,
strerror
(
errno
)));
}
}
return
(
success
<
0
?
-1
:
tid
);
}
long
PyThread_get_thread_ident
(
void
)
{
return
get_thread_id
(
NULL
);
}
static
void
do_PyThread_exit_thread
(
int
no_cleanup
)
{
dprintf
((
"PyThread_exit_thread called\n"
));
/* Thread-safe way to read a variable without a mutex: */
if
(
atomic_add
(
&
thread_count
,
0
)
==
0
) {
/* No threads around, so exit main(). */
if
(
no_cleanup
)
_exit
(
0
);
else
exit
(
0
);
}
else
{
/* We're a thread */
exit_thread
(
0
);
}
}
void
PyThread_exit_thread
(
void
)
{
do_PyThread_exit_thread
(
0
);
}
void
PyThread__exit_thread
(
void
)
{
do_PyThread_exit_thread
(
1
);
}
#ifndef
NO_EXIT_PROG
static
void
do_PyThread_exit_prog
(
int
status
,
int
no_cleanup
)
{
dprintf
((
"PyThread_exit_prog(%d) called\n"
,
status
));
/* No need to do anything, the threads get torn down if main()exits. */
if
(
no_cleanup
)
_exit
(
status
);
else
exit
(
status
);
}
void
PyThread_exit_prog
(
int
status
)
{
do_PyThread_exit_prog
(
status
,
0
);
}
void
PyThread__exit_prog
(
int
status
)
{
do_PyThread_exit_prog
(
status
,
1
);
}
#endif
/* NO_EXIT_PROG */
/*
* Lock support.
*
*/
static
atomic_t
lock_count
=
0
;
PyThread_type_lock
PyThread_allocate_lock
(
void
)
{
#ifdef
FASTLOCK
fastmutex_t
*
lock
;
#else
sem_id
sema
;
#endif
char
name
[
OS_NAME_LENGTH
];
atomic_t
this_lock
;
dprintf
((
"PyThread_allocate_lock called\n"
));
#ifdef
FASTLOCK
lock
=
(
fastmutex_t
*
)
malloc
(
sizeof
(
fastmutex_t
));
if
(
lock
==
NULL
) {
dprintf
((
"PyThread_allocate_lock failed: out of memory\n"
));
return
(
PyThread_type_lock
)
NULL
;
}
#endif
this_lock
=
atomic_add
(
&
lock_count
,
1
);
PyOS_snprintf
(
name
,
sizeof
(
name
),
"python lock (%d)"
,
this_lock
);
#ifdef
FASTLOCK
if
(
fastmutex_create
(
name
,
lock
)
<
0
) {
dprintf
((
"PyThread_allocate_lock failed: %s\n"
,
strerror
(
errno
)));
free
(
lock
);
lock
=
NULL
;
}
dprintf
((
"PyThread_allocate_lock()-> %p\n"
,
lock
));
return
(
PyThread_type_lock
)
lock
;
#else
sema
=
create_semaphore
(
name
,
1
,
0
);
if
(
sema
<
0
) {
dprintf
((
"PyThread_allocate_lock failed: %s\n"
,
strerror
(
errno
)));
sema
=
0
;
}
dprintf
((
"PyThread_allocate_lock()-> %p\n"
,
sema
));
return
(
PyThread_type_lock
)
sema
;
#endif
}
void
PyThread_free_lock
(
PyThread_type_lock
lock
)
{
dprintf
((
"PyThread_free_lock(%p) called\n"
,
lock
));
#ifdef
FASTLOCK
if
(
fastmutex_destroy
((
fastmutex_t
*
)
lock
)
<
0
) {
dprintf
((
"PyThread_free_lock(%p) failed: %s\n"
,
lock
,
strerror
(
errno
)));
}
free
(
lock
);
#else
if
(
delete_semaphore
((
sem_id
)
lock
)
<
0
) {
dprintf
((
"PyThread_free_lock(%p) failed: %s\n"
,
lock
,
strerror
(
errno
)));
}
#endif
}
int
PyThread_acquire_lock
(
PyThread_type_lock
lock
,
int
waitflag
)
{
int
retval
;
dprintf
((
"PyThread_acquire_lock(%p, %d) called\n"
,
lock
,
waitflag
));
#ifdef
FASTLOCK
if
(
waitflag
)
retval
=
fastmutex_lock
((
fastmutex_t
*
)
lock
);
else
retval
=
fastmutex_timedlock
((
fastmutex_t
*
)
lock
,
0
);
#else
if
(
waitflag
)
retval
=
lock_semaphore
((
sem_id
)
lock
);
else
retval
=
lock_semaphore_x
((
sem_id
)
lock
,
1
,
0
,
0
);
#endif
if
(
retval
<
0
) {
dprintf
((
"PyThread_acquire_lock(%p, %d) failed: %s\n"
,
lock
,
waitflag
,
strerror
(
errno
)));
}
dprintf
((
"PyThread_acquire_lock(%p, %d)-> %d\n"
,
lock
,
waitflag
,
retval
));
return
retval
<
0
?
0
:
1
;
}
void
PyThread_release_lock
(
PyThread_type_lock
lock
)
{
dprintf
((
"PyThread_release_lock(%p) called\n"
,
lock
));
#ifdef
FASTLOCK
if
(
fastmutex_unlock
((
fastmutex_t
*
)
lock
)
<
0
) {
dprintf
((
"PyThread_release_lock(%p) failed: %s\n"
,
lock
,
strerror
(
errno
)));
}
#else
if
(
unlock_semaphore
((
sem_id
)
lock
)
<
0
) {
dprintf
((
"PyThread_release_lock(%p) failed: %s\n"
,
lock
,
strerror
(
errno
)));
}
#endif
}
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