2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
5 * gstthread.c: Threaded container object
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
25 //#define GST_DEBUG_ENABLED
26 #include "gst_private.h"
28 #include "gstthread.h"
29 #include "gstscheduler.h"
32 GstElementDetails gst_thread_details = {
35 "Container that creates/manages a thread",
37 "Erik Walthinsen <omega@cse.ogi.edu>",
42 /* Thread signals and args */
61 static void gst_thread_class_init (GstThreadClass *klass);
62 static void gst_thread_init (GstThread *thread);
64 static void gst_thread_dispose (GObject *object);
66 static void gst_thread_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
67 static void gst_thread_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
69 static GstElementStateReturn gst_thread_change_state (GstElement *element);
71 #ifndef GST_DISABLE_LOADSAVE
72 static xmlNodePtr gst_thread_save_thyself (GstObject *object, xmlNodePtr parent);
73 static void gst_thread_restore_thyself (GstObject *object, xmlNodePtr self);
76 static void gst_thread_signal_thread (GstThread *thread, gboolean spinning);
78 static void* gst_thread_main_loop (void *arg);
80 static GstBinClass *parent_class = NULL;
81 //static guint gst_thread_signals[LAST_SIGNAL] = { 0 };
84 gst_thread_get_type(void) {
85 static GType thread_type = 0;
88 static const GTypeInfo thread_info = {
89 sizeof(GstThreadClass),
92 (GClassInitFunc)gst_thread_class_init,
97 (GInstanceInitFunc)gst_thread_init,
100 thread_type = g_type_register_static(GST_TYPE_BIN, "GstThread", &thread_info, 0);
106 gst_thread_class_init (GstThreadClass *klass)
108 GObjectClass *gobject_class;
109 GstObjectClass *gstobject_class;
110 GstElementClass *gstelement_class;
111 GstBinClass *gstbin_class;
113 gobject_class = (GObjectClass*)klass;
114 gstobject_class = (GstObjectClass*)klass;
115 gstelement_class = (GstElementClass*)klass;
116 gstbin_class = (GstBinClass*)klass;
118 parent_class = g_type_class_ref (GST_TYPE_BIN);
120 g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_CREATE_THREAD,
121 g_param_spec_boolean("create_thread", "Create Thread", "Whether to create a thread.",
122 TRUE,G_PARAM_READWRITE));
124 gobject_class->dispose = gst_thread_dispose;
126 #ifndef GST_DISABLE_LOADSAVE
127 gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_thread_save_thyself);
128 gstobject_class->restore_thyself = GST_DEBUG_FUNCPTR(gst_thread_restore_thyself);
131 gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_thread_change_state);
133 // gstbin_class->schedule = gst_thread_schedule_dummy;
135 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_thread_set_property);
136 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_thread_get_property);
141 gst_thread_init (GstThread *thread)
144 GST_DEBUG (GST_CAT_THREAD,"initializing thread\n");
146 // we're a manager by default
147 GST_FLAG_SET (thread, GST_BIN_FLAG_MANAGER);
149 // default is to create a thread
150 GST_FLAG_SET (thread, GST_THREAD_CREATE);
152 thread->lock = g_mutex_new();
153 thread->cond = g_cond_new();
155 GST_ELEMENT_SCHED(thread) = gst_schedule_new(GST_ELEMENT(thread));
156 GST_DEBUG(GST_CAT_THREAD, "thread's scheduler is %p\n",GST_ELEMENT_SCHED(thread));
158 thread->ppid = getpid();
160 // gst_element_set_manager(GST_ELEMENT(thread),GST_ELEMENT(thread));
164 gst_thread_dispose (GObject *object)
166 GstThread *thread = GST_THREAD (object);
168 GST_DEBUG (GST_CAT_REFCOUNTING,"dispose\n");
170 g_mutex_free (thread->lock);
171 g_cond_free (thread->cond);
173 G_OBJECT_CLASS (parent_class)->dispose (object);
175 gst_object_destroy (GST_OBJECT (GST_ELEMENT_SCHED (thread)));
176 gst_object_unref (GST_OBJECT (GST_ELEMENT_SCHED (thread)));
181 gst_thread_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
183 /* it's not null if we got it, but it might not be ours */
184 g_return_if_fail (GST_IS_THREAD (object));
187 case ARG_CREATE_THREAD:
188 if (g_value_get_boolean(value)) {
189 GST_INFO (GST_CAT_THREAD,"turning ON the creation of the thread");
190 GST_FLAG_SET (object, GST_THREAD_CREATE);
191 // GST_DEBUG (GST_CAT_THREAD,"flags are 0x%08x\n", GST_FLAGS (object));
193 GST_INFO (GST_CAT_THREAD,"gstthread: turning OFF the creation of the thread");
194 GST_FLAG_UNSET (object, GST_THREAD_CREATE);
195 // GST_DEBUG (GST_CAT_THREAD,"gstthread: flags are 0x%08x\n", GST_FLAGS (object));
199 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
205 gst_thread_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
207 /* it's not null if we got it, but it might not be ours */
208 g_return_if_fail (GST_IS_THREAD (object));
211 case ARG_CREATE_THREAD:
212 g_value_set_boolean(value, GST_FLAG_IS_SET (object, GST_THREAD_CREATE));
215 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
223 * @name: the name of the thread
225 * Create a new thread with the given name.
227 * Returns: The new thread
230 gst_thread_new (const guchar *name)
232 return gst_elementfactory_make ("thread", name);
236 #define THR_INFO(format,args...) \
237 GST_INFO_ELEMENT(GST_CAT_THREAD, thread, "sync(" GST_DEBUG_THREAD_FORMAT "): " format , \
238 GST_DEBUG_THREAD_ARGS(thread->pid) , ## args )
239 #define THR_DEBUG(format,args...) \
240 GST_DEBUG_ELEMENT(GST_CAT_THREAD, thread, "sync(" GST_DEBUG_THREAD_FORMAT "): " format , \
241 GST_DEBUG_THREAD_ARGS(thread->pid) , ## args )
243 #define THR_INFO_MAIN(format,args...) \
244 GST_INFO_ELEMENT(GST_CAT_THREAD, thread, "sync-main(" GST_DEBUG_THREAD_FORMAT "): " format , \
245 GST_DEBUG_THREAD_ARGS(thread->ppid) , ## args )
246 #define THR_DEBUG_MAIN(format,args...) \
247 GST_DEBUG_ELEMENT(GST_CAT_THREAD, thread, "sync-main(" GST_DEBUG_THREAD_FORMAT "): " format , \
248 GST_DEBUG_THREAD_ARGS(thread->ppid) , ## args )
251 static GstElementStateReturn
252 gst_thread_change_state (GstElement *element)
255 gboolean stateset = GST_STATE_SUCCESS;
257 pthread_t self = pthread_self();
259 g_return_val_if_fail (GST_IS_THREAD(element), FALSE);
260 // GST_DEBUG_ENTER("(\"%s\")",GST_ELEMENT_NAME(element));
262 thread = GST_THREAD (element);
263 // GST_DEBUG (GST_CAT_THREAD, "**** THREAD %ld changing THREAD %ld ****\n",self,thread->thread_id);
264 // GST_DEBUG (GST_CAT_THREAD, "**** current pid=%d\n",getpid());
266 transition = GST_STATE_TRANSITION (element);
268 THR_INFO("changing state from %s to %s",
269 gst_element_statename(GST_STATE (element)),
270 gst_element_statename(GST_STATE_PENDING (element)));
272 //GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
274 switch (transition) {
275 case GST_STATE_NULL_TO_READY:
276 // set the state to idle
277 GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
278 GST_FLAG_UNSET (thread, GST_THREAD_STATE_REAPING);
280 // create the thread if that's what we're supposed to do
281 if (GST_FLAG_IS_SET (thread, GST_THREAD_CREATE)) {
282 THR_DEBUG ("creating thread \"%s\"\n",
283 GST_ELEMENT_NAME (element));
285 g_mutex_lock (thread->lock);
288 pthread_create (&thread->thread_id, NULL,
289 gst_thread_main_loop, thread);
291 // wait for it to 'spin up'
292 THR_DEBUG("waiting for child thread spinup\n");
293 g_cond_wait(thread->cond,thread->lock);
294 THR_DEBUG("thread claims to be up\n");
295 g_mutex_unlock(thread->lock);
297 GST_INFO (GST_CAT_THREAD, "NOT creating thread \"%s\"",
298 GST_ELEMENT_NAME (GST_ELEMENT (element)));
300 // punt and change state on all the children
301 if (GST_ELEMENT_CLASS (parent_class)->change_state)
302 stateset = GST_ELEMENT_CLASS (parent_class)->change_state (element);
305 case GST_STATE_READY_TO_PAUSED:
306 THR_INFO("readying thread");
308 // check to see if the thread is somehow changing its own state.
309 // FIXME this is currently illegal, but must somehow be made legal at some point.
310 if (pthread_equal(self, thread->thread_id))
312 //FIXME this should not happen
313 g_assert(!pthread_equal(self, thread->thread_id));
314 GST_FLAG_SET(thread, GST_THREAD_STATE_SPINNING);
315 GST_DEBUG(GST_CAT_THREAD,"no sync(" GST_DEBUG_THREAD_FORMAT "): setting own thread's state to spinning\n",
316 GST_DEBUG_THREAD_ARGS(thread->pid));
320 g_mutex_lock(thread->lock);
321 gst_thread_signal_thread(thread,FALSE);
324 case GST_STATE_PAUSED_TO_PLAYING:
325 THR_INFO("starting thread");
327 // check to see if the thread is somehow changing its own state.
328 // FIXME this is currently illegal, but must somehow be made legal at some point.
329 if (pthread_equal(self, thread->thread_id))
331 //FIXME this should not happen
332 g_assert(!pthread_equal(self, thread->thread_id));
333 GST_FLAG_SET(thread, GST_THREAD_STATE_SPINNING);
334 GST_DEBUG(GST_CAT_THREAD,"no sync(" GST_DEBUG_THREAD_FORMAT "): setting own thread's state to spinning\n",
335 GST_DEBUG_THREAD_ARGS(thread->pid));
339 THR_DEBUG("telling thread to start spinning\n");
340 g_mutex_lock(thread->lock);
341 gst_thread_signal_thread(thread,TRUE);
344 case GST_STATE_PLAYING_TO_PAUSED:
345 THR_INFO("pausing thread");
347 // check to see if the thread is somehow changing its own state.
348 // FIXME this is currently illegal, but must somehow be made legal at some point.
349 if (pthread_equal(self, thread->thread_id))
351 //FIXME this should not happen
352 GST_DEBUG(GST_CAT_THREAD,"no sync(" GST_DEBUG_THREAD_FORMAT "): setting own thread's state to paused\n",
353 GST_DEBUG_THREAD_ARGS(thread->pid));
354 GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
355 g_assert(!pthread_equal(self, thread->thread_id));
359 GList *elements = (element->sched)->elements;
361 // the following code ensures that the bottom half of thread will run
362 // to perform each elements' change_state() (by calling gstbin.c::
364 // + the pending state was already set by gstelement.c::set_state()
365 // + find every queue we manage, and signal its empty and full conditions
367 g_mutex_lock(thread->lock);
369 GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
373 GstElement *e = GST_ELEMENT(elements->data);
375 THR_DEBUG(" element \"%s\"\n",GST_ELEMENT_NAME(e));
376 elements = g_list_next(elements);
379 //FIXME make this more efficient by only waking queues that are asleep
380 //FIXME and only waking the appropriate condition (depending on if it's
381 //FIXME on up- or down-stream side)
383 //FIXME also make this more efficient by keeping list of managed queues
384 THR_DEBUG("waking queue \"%s\"\n",GST_ELEMENT_NAME(e));
386 g_cond_signal((GST_QUEUE(e)->emptycond));
387 g_cond_signal((GST_QUEUE(e)->fullcond));
392 GList *pads = GST_ELEMENT_PADS(e);
396 GstElement *peerelement;
397 GstPad *p = GST_PAD(pads->data);
398 pads = g_list_next(pads);
400 peer = GST_PAD_PEER(p);
403 peerelement = GST_PAD_PARENT(peer);
404 if (!peerelement) continue; // deal with case where there's no peer
406 if (!GST_FLAG_IS_SET(peerelement,GST_ELEMENT_DECOUPLED)) {
407 GST_DEBUG(GST_CAT_THREAD,"peer element isn't DECOUPLED\n");
411 // FIXME this needs to go away eventually
412 if (!GST_IS_QUEUE(peerelement)) {
413 GST_DEBUG(GST_CAT_THREAD,"peer element isn't a Queue\n");
417 if (GST_ELEMENT_SCHED(peerelement) != GST_ELEMENT_SCHED(thread))
419 THR_DEBUG(" element \"%s\" has pad cross sched boundary\n",GST_ELEMENT_NAME(e));
420 GST_LOCK(peerelement);
421 g_cond_signal(GST_QUEUE(peerelement)->emptycond);
422 g_cond_signal(GST_QUEUE(peerelement)->fullcond);
423 GST_UNLOCK(peerelement);
428 THR_DEBUG("waiting for thread to stop spinning\n");
429 g_cond_wait (thread->cond, thread->lock);
430 THR_DEBUG("telling thread to pause\n");
431 gst_thread_signal_thread(thread,FALSE);
434 case GST_STATE_READY_TO_NULL:
435 THR_INFO("stopping thread");
437 GST_FLAG_SET (thread, GST_THREAD_STATE_REAPING);
439 // check to see if the thread is somehow changing its own state.
440 // FIXME this is currently illegal, but must somehow be made legal at some point.
441 if (pthread_equal(self, thread->thread_id))
443 //FIXME this should not happen
444 g_assert(!pthread_equal(self, thread->thread_id));
445 THR_DEBUG("setting own thread's state to NULL (paused)\n");
446 GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
450 THR_DEBUG("telling thread to pause (null) - and joining\n");
451 //MattH FIXME revisit
452 g_mutex_lock(thread->lock);
453 gst_thread_signal_thread(thread,FALSE);
454 pthread_join(thread->thread_id,NULL);
457 GST_FLAG_UNSET(thread,GST_THREAD_STATE_REAPING);
458 GST_FLAG_UNSET(thread,GST_THREAD_STATE_STARTED);
459 GST_FLAG_UNSET(thread,GST_THREAD_STATE_SPINNING);
460 GST_FLAG_UNSET(thread,GST_THREAD_STATE_ELEMENT_CHANGED);
463 case GST_STATE_PAUSED_TO_READY:
464 THR_INFO("stopping thread");
466 // check to see if the thread is somehow changing its own state.
467 // FIXME this is currently illegal, but must somehow be made legal at some point.
468 if (pthread_equal(self, thread->thread_id))
470 //FIXME this should not happen
471 g_assert(!pthread_equal(self, thread->thread_id));
472 GST_FLAG_SET(thread, GST_THREAD_STATE_SPINNING);
473 GST_DEBUG(GST_CAT_THREAD,"no sync(" GST_DEBUG_THREAD_FORMAT "): setting own thread's state to spinning\n",
474 GST_DEBUG_THREAD_ARGS(thread->pid));
478 THR_DEBUG("telling thread to stop spinning\n");
479 g_mutex_lock(thread->lock);
480 gst_thread_signal_thread(thread,FALSE);
485 GST_DEBUG_ELEMENT(GST_CAT_THREAD, element, "UNHANDLED STATE CHANGE! %x\n",transition);
492 static void gst_thread_update_state (GstThread *thread)
494 // check for state change
495 if (GST_STATE_PENDING(thread) != GST_STATE_VOID_PENDING) {
496 // punt and change state on all the children
497 if (GST_ELEMENT_CLASS (parent_class)->change_state)
498 GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT(thread));
503 * gst_thread_main_loop:
504 * @arg: the thread to start
506 * The main loop of the thread. The thread will iterate
507 * while the state is GST_THREAD_STATE_SPINNING
510 gst_thread_main_loop (void *arg)
512 GstThread *thread = GST_THREAD (arg);
515 thread->pid = getpid();
516 THR_INFO_MAIN("thread is running");
518 // first we need to change the state of all the children
519 if (GST_ELEMENT_CLASS (parent_class)->change_state)
520 stateset = GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT(thread));
522 // construct the plan and signal back
523 /* DEPRACATED for INCSCHED1
524 THR_DEBUG_MAIN("creating plan for thread\n");
525 if (GST_BIN_CLASS (parent_class)->schedule)
526 GST_BIN_CLASS (parent_class)->schedule (GST_BIN (thread));
529 // THR_DEBUG_MAIN("indicating spinup\n");
530 g_mutex_lock (thread->lock);
531 g_cond_signal (thread->cond);
532 // don't unlock the mutex because we hold it into the top of the while loop
533 THR_DEBUG_MAIN("thread has indicated spinup to parent process\n");
535 /***** THREAD IS NOW IN READY STATE *****/
537 while (!GST_FLAG_IS_SET (thread, GST_THREAD_STATE_REAPING)) {
538 // NOTE we hold the thread lock at this point
539 // what we do depends on what state we're in
540 switch (GST_STATE(thread)) {
541 // NOTE: cannot be in NULL, we're not running in that state at all
542 case GST_STATE_READY:
543 // wait to be set to either the NULL or PAUSED states
544 THR_DEBUG_MAIN("thread in %s state, waiting for either %s or %s\n",
545 gst_element_statename(GST_STATE_READY),
546 gst_element_statename(GST_STATE_NULL),
547 gst_element_statename(GST_STATE_PAUSED));
548 g_cond_wait(thread->cond,thread->lock);
549 // been signaled, we need to state transition now and signal back
550 gst_thread_update_state(thread);
551 THR_DEBUG_MAIN("done with state transition, signaling back to parent process\n");
552 g_cond_signal(thread->cond);
553 // g_mutex_unlock(thread->lock);
554 // now we decide what to do next (FIXME can be collapsed to a continue)
555 if (GST_STATE(thread) == GST_STATE_NULL) {
556 // REAPING must be set, we can simply break this iteration
559 // PAUSED is the next state, we can wait for that next
563 case GST_STATE_PAUSED:
564 // wait to be set to either the READY or PLAYING states
565 THR_DEBUG_MAIN("thread in %s state, waiting for either %s or %s\n",
566 gst_element_statename(GST_STATE_PAUSED),
567 gst_element_statename(GST_STATE_READY),
568 gst_element_statename(GST_STATE_PLAYING));
569 g_cond_wait(thread->cond,thread->lock);
570 // been signaled, we need to state transition now and signal back
571 gst_thread_update_state(thread);
572 g_cond_signal(thread->cond);
573 // g_mutex_unlock(thread->lock);
574 // now we decide what to do next
575 if (GST_STATE(thread) == GST_STATE_READY) {
576 // READY is the next state, we can wait for that next
579 g_mutex_unlock(thread->lock);
580 // PLAYING is coming up, so we can now start spinning
581 while (GST_FLAG_IS_SET (thread, GST_THREAD_STATE_SPINNING)) {
582 if (!gst_bin_iterate (GST_BIN (thread))) {
583 // GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
584 // THR_DEBUG_MAIN("removed spinning state due to failed iteration!\n");
585 // FIXME FIXME FIXME this is ugly!
586 THR_DEBUG_MAIN("iteration failed, something very wrong, spinning to let parent sync\n");
587 while (GST_FLAG_IS_SET(thread, GST_THREAD_STATE_SPINNING)) ;
590 g_mutex_lock(thread->lock);
591 // once we're here, SPINNING has stopped, we should signal that we're done
592 THR_DEBUG_MAIN("SPINNING stopped, signaling back to parent process\n");
593 g_cond_signal (thread->cond);
594 // now we can wait for PAUSED
598 case GST_STATE_PLAYING:
599 // wait to be set to PAUSED
600 THR_DEBUG_MAIN("thread in %s state, waiting for %s\n",
601 gst_element_statename(GST_STATE_PLAYING),
602 gst_element_statename(GST_STATE_PAUSED));
603 g_cond_wait(thread->cond,thread->lock);
604 // been signaled, we need to state transition now and signal back
605 gst_thread_update_state(thread);
606 g_cond_signal(thread->cond);
607 // g_mutex_unlock(thread->lock);
608 // now we decide what to do next
609 // there's only PAUSED, we we just wait for it
614 // need to grab the lock so we're ready for the top of the loop
615 // g_mutex_lock(thread->lock);
619 while (!GST_FLAG_IS_SET (thread, GST_THREAD_STATE_REAPING)) {
620 // start out by waiting for a state change into spinning
621 THR_DEBUG_MAIN("waiting for signal from parent process (at top of while())\n");
622 g_cond_wait (thread->cond,thread->lock);
623 THR_DEBUG_MAIN("woken up with %s pending\n",gst_element_statename(GST_STATE(thread)));
624 // now is a good time to change the state of the children and the thread itself
625 gst_thread_update_state (thread);
626 THR_DEBUG_MAIN("done changing state, signaling back\n");
627 g_cond_signal (thread->cond);
628 g_mutex_unlock (thread->lock);
629 THR_DEBUG_MAIN("finished sycnronizing with main process\n");
631 while (GST_FLAG_IS_SET (thread, GST_THREAD_STATE_SPINNING)) {
632 if (!gst_bin_iterate (GST_BIN (thread))) {
633 GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
634 THR_DEBUG_MAIN("removed spinning state due to failed iteration!\n");
638 g_mutex_lock (thread->lock);
640 if (GST_STATE_PENDING(thread) == GST_STATE_PAUSED) {
641 // we've stopped spinning, because of PLAYING->PAUSED
642 THR_DEBUG_MAIN("SPINNING flag unset, signaling parent process we're stopped\n");
643 // we need to signal back that we've stopped spinning
644 g_cond_signal (thread->cond);
647 // THR_DEBUG_MAIN("signaling that the thread is out of the SPINNING loop\n");
648 // g_cond_signal (thread->cond);
649 // g_cond_wait (thread->cond, thread->lock);
650 // THR_DEBUG_MAIN("parent process has signaled at bottom of while\n");
651 // // now change the children's and thread's state
652 // gst_thread_update_state (thread);
653 // THR_DEBUG_MAIN("done changing state, signaling back to parent process\n");
654 // g_cond_signal (thread->cond);
655 // // don't release the mutex, we hold that into the top of the loop
656 // THR_DEBUG_MAIN("done syncing with parent process at bottom of while\n");
660 // since we don't unlock at the end of the while loop, do it here
661 g_mutex_unlock (thread->lock);
663 GST_INFO (GST_CAT_THREAD, "gstthread: thread \"%s\" is stopped",
664 GST_ELEMENT_NAME (thread));
668 // the set flag is to say whether it should set TRUE or FALSE
670 // WARNING: this has synchronization built in! if you remove or add any
671 // locks, waits, signals, or unlocks you need to be sure they match the
672 // code above (in gst_thread_main_loop()). basically, don't change anything.
674 gst_thread_signal_thread (GstThread *thread, gboolean spinning)
676 // set the spinning state
677 if (spinning) GST_FLAG_SET(thread,GST_THREAD_STATE_SPINNING);
678 else GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
680 THR_DEBUG("thread locked\n");
681 // g_mutex_lock(thread->lock);
684 // THR_DEBUG("waiting for spindown\n");
685 // g_cond_wait (thread->cond, thread->lock);
687 THR_DEBUG("signaling\n");
688 g_cond_signal (thread->cond);
689 THR_DEBUG("waiting for ack\n");
690 g_cond_wait (thread->cond,thread->lock);
691 THR_DEBUG("got ack\n");
693 THR_DEBUG("unlocking\n");
694 g_mutex_unlock(thread->lock);
695 THR_DEBUG("unlocked\n");
699 #ifndef GST_DISABLE_LOADSAVE
701 gst_thread_save_thyself (GstObject *object,
704 if (GST_OBJECT_CLASS (parent_class)->save_thyself)
705 GST_OBJECT_CLASS (parent_class)->save_thyself (object, self);
710 gst_thread_restore_thyself (GstObject *object,
713 GST_DEBUG (GST_CAT_THREAD,"gstthread: restore\n");
715 if (GST_OBJECT_CLASS (parent_class)->restore_thyself)
716 GST_OBJECT_CLASS (parent_class)->restore_thyself (object, self);
718 #endif // GST_DISABLE_LOADSAVE