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cpython/Python/thread_pth.h at 2.7 · python-emscripten/cpython · GitHub
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/* GNU pth threads interface
http://www.gnu.org/software/pth
2000-05-03 Andy Dustman <andy@dustman.net>
Adapted from Posix threads interface
12 May 1997 -- david arnold <davida@pobox.com>
*/
#include
<stdlib.h>
#include
<string.h>
#include
<pth.h>
/* A pth mutex isn't sufficient to model the Python lock type
* because pth mutexes can be acquired multiple times by the
* same thread.
*
* The pth_lock struct implements a Python lock as a "locked?" bit
* and a <condition, mutex> pair. In general, if the bit can be acquired
* instantly, it is, else the pair is used to block the thread until the
* bit is cleared.
*/
typedef
struct
{
char
locked
;
/* 0=unlocked, 1=locked */
/* a <cond, mutex> pair to handle an acquire of a locked lock */
pth_cond_t
lock_released
;
pth_mutex_t
mut
;
}
pth_lock
;
#define
CHECK_STATUS
(
name
) if (status == -1) { printf("%d ", status); perror(name); error = 1; }
pth_attr_t
PyThread_attr
;
/*
* Initialization.
*/
static
void
PyThread__init_thread
(
void
)
{
pth_init
();
PyThread_attr
=
pth_attr_new
();
pth_attr_set
(
PyThread_attr
,
PTH_ATTR_STACK_SIZE
,
1
<<
18
);
pth_attr_set
(
PyThread_attr
,
PTH_ATTR_JOINABLE
, FALSE);
}
/*
* Thread support.
*/
long
PyThread_start_new_thread
(
void
(
*
func
)(
void
*
),
void
*
arg
)
{
pth_t
th
;
dprintf
((
"PyThread_start_new_thread called\n"
));
if
(!
initialized
)
PyThread_init_thread
();
th
=
pth_spawn
(
PyThread_attr
,
(
void
*
(
*
)(
void
*
))
func
,
(
void
*
)
arg
);
return
th
;
}
long
PyThread_get_thread_ident
(
void
)
{
volatile
pth_t
threadid
;
if
(!
initialized
)
PyThread_init_thread
();
/* Jump through some hoops for Alpha OSF/1 */
threadid
=
pth_self
();
return
(
long
)
*
(
long
*
)
&
threadid
;
}
void
PyThread_exit_thread
(
void
)
{
dprintf
((
"PyThread_exit_thread called\n"
));
if
(!
initialized
) {
exit
(
0
);
}
}
/*
* Lock support.
*/
PyThread_type_lock
PyThread_allocate_lock
(
void
)
{
pth_lock
*
lock
;
int
status
,
error
=
0
;
dprintf
((
"PyThread_allocate_lock called\n"
));
if
(!
initialized
)
PyThread_init_thread
();
lock
=
(
pth_lock
*
)
malloc
(
sizeof
(
pth_lock
));
memset
((
void
*
)
lock
,
'\0'
,
sizeof
(
pth_lock
));
if
(
lock
) {
lock
->
locked
=
0
;
status
=
pth_mutex_init
(
&
lock
->
mut
);
CHECK_STATUS
(
"pth_mutex_init"
);
status
=
pth_cond_init
(
&
lock
->
lock_released
);
CHECK_STATUS
(
"pth_cond_init"
);
if
(
error
) {
free
((
void
*
)
lock
);
lock
=
NULL
;
}
}
dprintf
((
"PyThread_allocate_lock() -> %p\n"
,
lock
));
return
(
PyThread_type_lock
)
lock
;
}
void
PyThread_free_lock
(
PyThread_type_lock
lock
)
{
pth_lock
*
thelock
=
(
pth_lock
*
)
lock
;
dprintf
((
"PyThread_free_lock(%p) called\n"
,
lock
));
free
((
void
*
)
thelock
);
}
int
PyThread_acquire_lock
(
PyThread_type_lock
lock
,
int
waitflag
)
{
int
success
;
pth_lock
*
thelock
=
(
pth_lock
*
)
lock
;
int
status
,
error
=
0
;
dprintf
((
"PyThread_acquire_lock(%p, %d) called\n"
,
lock
,
waitflag
));
status
=
pth_mutex_acquire
(
&
thelock
->
mut
, !
waitflag
,
NULL
);
CHECK_STATUS
(
"pth_mutex_acquire[1]"
);
success
=
thelock
->
locked
==
0
;
if
(
success
)
thelock
->
locked
=
1
;
status
=
pth_mutex_release
(
&
thelock
->
mut
);
CHECK_STATUS
(
"pth_mutex_release[1]"
);
if
( !
success
&&
waitflag
) {
/* continue trying until we get the lock */
/* mut must be locked by me -- part of the condition
* protocol */
status
=
pth_mutex_acquire
(
&
thelock
->
mut
, !
waitflag
,
NULL
);
CHECK_STATUS
(
"pth_mutex_acquire[2]"
);
while
(
thelock
->
locked
) {
status
=
pth_cond_await
(
&
thelock
->
lock_released
,
&
thelock
->
mut
,
NULL
);
CHECK_STATUS
(
"pth_cond_await"
);
}
thelock
->
locked
=
1
;
status
=
pth_mutex_release
(
&
thelock
->
mut
);
CHECK_STATUS
(
"pth_mutex_release[2]"
);
success
=
1
;
}
if
(
error
)
success
=
0
;
dprintf
((
"PyThread_acquire_lock(%p, %d) -> %d\n"
,
lock
,
waitflag
,
success
));
return
success
;
}
void
PyThread_release_lock
(
PyThread_type_lock
lock
)
{
pth_lock
*
thelock
=
(
pth_lock
*
)
lock
;
int
status
,
error
=
0
;
dprintf
((
"PyThread_release_lock(%p) called\n"
,
lock
));
status
=
pth_mutex_acquire
(
&
thelock
->
mut
,
0
,
NULL
);
CHECK_STATUS
(
"pth_mutex_acquire[3]"
);
thelock
->
locked
=
0
;
status
=
pth_mutex_release
(
&
thelock
->
mut
);
CHECK_STATUS
(
"pth_mutex_release[3]"
);
/* wake up someone (anyone, if any) waiting on the lock */
status
=
pth_cond_notify
(
&
thelock
->
lock_released
,
0
);
CHECK_STATUS
(
"pth_cond_notify"
);
}
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