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- /***********************************************************
- Copyright 1991, 1992, 1993, 1994 by Stichting Mathematisch Centrum,
- Amsterdam, The Netherlands.
-
- All Rights Reserved
-
- Permission to use, copy, modify, and distribute this software and its
- documentation for any purpose and without fee is hereby granted,
- provided that the above copyright notice appear in all copies and that
- both that copyright notice and this permission notice appear in
- supporting documentation, and that the names of Stichting Mathematisch
- Centrum or CWI not be used in advertising or publicity pertaining to
- distribution of the software without specific, written prior permission.
-
- STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
- THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
- FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
- FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
- OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-
- ******************************************************************/
-
- /* Thread module */
- /* Interface to Sjoerd's portable C thread library */
-
- #include "allobjects.h"
- #include "modsupport.h"
- #include "ceval.h"
-
- #ifndef WITH_THREAD
- Error! The rest of Python is not compiled with thread support.
- Rerun configure, adding a --with-thread option.
- #endif
-
- #include "thread.h"
-
- extern int threads_started;
-
- static object *ThreadError;
-
-
- /* Lock objects */
-
- typedef struct {
- OB_HEAD
- type_lock lock_lock;
- } lockobject;
-
- staticforward typeobject Locktype;
-
- #define is_lockobject(v) ((v)->ob_type == &Locktype)
-
- type_lock
- getlocklock(lock)
- object *lock;
- {
- if (lock == NULL || !is_lockobject(lock))
- return NULL;
- else
- return ((lockobject *) lock)->lock_lock;
- }
-
- static lockobject *
- newlockobject()
- {
- lockobject *self;
- self = NEWOBJ(lockobject, &Locktype);
- if (self == NULL)
- return NULL;
- self->lock_lock = allocate_lock();
- if (self->lock_lock == NULL) {
- DEL(self);
- self = NULL;
- err_setstr(ThreadError, "can't allocate lock");
- }
- return self;
- }
-
- static void
- lock_dealloc(self)
- lockobject *self;
- {
- /* Unlock the lock so it's safe to free it */
- acquire_lock(self->lock_lock, 0);
- release_lock(self->lock_lock);
-
- free_lock(self->lock_lock);
- DEL(self);
- }
-
- static object *
- lock_acquire_lock(self, args)
- lockobject *self;
- object *args;
- {
- int i;
-
- if (args != NULL) {
- if (!getargs(args, "i", &i))
- return NULL;
- }
- else
- i = 1;
-
- BGN_SAVE
- i = acquire_lock(self->lock_lock, i);
- END_SAVE
-
- if (args == NULL) {
- INCREF(None);
- return None;
- }
- else
- return newintobject((long)i);
- }
-
- static object *
- lock_release_lock(self, args)
- lockobject *self;
- object *args;
- {
- if (!getnoarg(args))
- return NULL;
-
- /* Sanity check: the lock must be locked */
- if (acquire_lock(self->lock_lock, 0)) {
- release_lock(self->lock_lock);
- err_setstr(ThreadError, "release unlocked lock");
- return NULL;
- }
-
- release_lock(self->lock_lock);
- INCREF(None);
- return None;
- }
-
- static object *
- lock_locked_lock(self, args)
- lockobject *self;
- object *args;
- {
- if (!getnoarg(args))
- return NULL;
-
- if (acquire_lock(self->lock_lock, 0)) {
- release_lock(self->lock_lock);
- return newintobject(0L);
- }
- return newintobject(1L);
- }
-
- static struct methodlist lock_methods[] = {
- {"acquire_lock", (method)lock_acquire_lock},
- {"acquire", (method)lock_acquire_lock},
- {"release_lock", (method)lock_release_lock},
- {"release", (method)lock_release_lock},
- {"locked_lock", (method)lock_locked_lock},
- {"locked", (method)lock_locked_lock},
- {NULL, NULL} /* sentinel */
- };
-
- static object *
- lock_getattr(self, name)
- lockobject *self;
- char *name;
- {
- return findmethod(lock_methods, (object *)self, name);
- }
-
- static typeobject Locktype = {
- OB_HEAD_INIT(&Typetype)
- 0, /*ob_size*/
- "lock", /*tp_name*/
- sizeof(lockobject), /*tp_size*/
- 0, /*tp_itemsize*/
- /* methods */
- (destructor)lock_dealloc, /*tp_dealloc*/
- 0, /*tp_print*/
- (getattrfunc)lock_getattr, /*tp_getattr*/
- 0, /*tp_setattr*/
- 0, /*tp_compare*/
- 0, /*tp_repr*/
- };
-
-
- /* Module functions */
-
- static void
- t_bootstrap(args_raw)
- void *args_raw;
- {
- object *args = (object *) args_raw;
- object *func, *arg, *res;
-
- threads_started++;
-
- restore_thread((void *)NULL);
- func = gettupleitem(args, 0);
- arg = gettupleitem(args, 1);
- res = call_object(func, arg);
- DECREF(args); /* Matches the INCREF(args) in thread_start_new_thread */
- if (res == NULL) {
- fprintf(stderr, "Unhandled exception in thread:\n");
- print_error(); /* From pythonmain.c */
- }
- (void) save_thread();
- exit_thread();
- }
-
- static object *
- thread_start_new_thread(self, args)
- object *self; /* Not used */
- object *args;
- {
- object *func, *arg;
-
- if (!getargs(args, "(OO)", &func, &arg))
- return NULL;
- INCREF(args);
- /* Initialize the interpreter's stack save/restore mechanism */
- init_save_thread();
- if (!start_new_thread(t_bootstrap, (void*) args)) {
- DECREF(args);
- err_setstr(ThreadError, "can't start new thread\n");
- return NULL;
- }
- /* Otherwise the DECREF(args) is done by t_bootstrap */
- INCREF(None);
- return None;
- }
-
- static object *
- thread_exit_thread(self, args)
- object *self; /* Not used */
- object *args;
- {
- if (!getnoarg(args))
- return NULL;
- (void) save_thread();
- exit_thread();
- for (;;) { } /* Should not be reached */
- }
-
- #ifndef NO_EXIT_PROG
- static object *
- thread_exit_prog(self, args)
- object *self; /* Not used */
- object *args;
- {
- int sts;
- if (!getargs(args, "i", &sts))
- return NULL;
- goaway(sts); /* Calls exit_prog(sts) or _exit_prog(sts) */
- for (;;) { } /* Should not be reached */
- }
- #endif
-
- static object *
- thread_allocate_lock(self, args)
- object *self; /* Not used */
- object *args;
- {
- if (!getnoarg(args))
- return NULL;
- return (object *) newlockobject();
- }
-
- static object *
- thread_get_ident(self, args)
- object *self; /* Not used */
- object *args;
- {
- long ident;
- if (!getnoarg(args))
- return NULL;
- ident = get_thread_ident();
- if (ident == -1) {
- err_setstr(ThreadError, "no current thread ident");
- return NULL;
- }
- return newintobject(ident);
- }
-
- static struct methodlist thread_methods[] = {
- {"start_new_thread", (method)thread_start_new_thread},
- {"start_new", (method)thread_start_new_thread},
- {"allocate_lock", (method)thread_allocate_lock},
- {"allocate", (method)thread_allocate_lock},
- {"exit_thread", (method)thread_exit_thread},
- {"exit", (method)thread_exit_thread},
- {"get_ident", (method)thread_get_ident},
- #ifndef NO_EXIT_PROG
- {"exit_prog", (method)thread_exit_prog},
- #endif
- {NULL, NULL} /* sentinel */
- };
-
-
- /* Initialization function */
-
- void
- initthread()
- {
- object *m, *d, *x;
-
- /* Create the module and add the functions */
- m = initmodule("thread", thread_methods);
-
- /* Add a symbolic constant */
- d = getmoduledict(m);
- ThreadError = newstringobject("thread.error");
- INCREF(ThreadError);
- dictinsert(d, "error", ThreadError);
-
- /* Check for errors */
- if (err_occurred())
- fatal("can't initialize module thread");
-
- /* Initialize the C thread library */
- init_thread();
- }
-