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"
29 #include "gstthread.h"
30 #include "gstscheduler.h"
33 GstElementDetails gst_thread_details = {
36 "Container that creates/manages a thread",
38 "Erik Walthinsen <omega@cse.ogi.edu>",
43 /* Thread signals and args */
64 static void gst_thread_class_init (GstThreadClass *klass);
65 static void gst_thread_init (GstThread *thread);
67 static void gst_thread_dispose (GObject *object);
69 static void gst_thread_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
70 static void gst_thread_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
72 static GstElementStateReturn gst_thread_change_state (GstElement *element);
74 #ifndef GST_DISABLE_LOADSAVE
75 static xmlNodePtr gst_thread_save_thyself (GstObject *object, xmlNodePtr parent);
76 static void gst_thread_restore_thyself (GstObject *object, xmlNodePtr self);
79 static void* gst_thread_main_loop (void *arg);
81 #define GST_TYPE_THREAD_SCHEDPOLICY (gst_thread_schedpolicy_get_type())
83 gst_thread_schedpolicy_get_type(void) {
84 static GType thread_schedpolicy_type = 0;
85 static GEnumValue thread_schedpolicy[] = {
86 {SCHED_OTHER, "SCHED_OTHER", "Normal Scheduling"},
87 {SCHED_FIFO, "SCHED_FIFO", "FIFO Scheduling (requires root)"},
88 {SCHED_RR, "SCHED_RR", "Round-Robin Scheduling (requires root)"},
91 if (!thread_schedpolicy_type) {
92 thread_schedpolicy_type = g_enum_register_static("GstThreadSchedPolicy", thread_schedpolicy);
94 return thread_schedpolicy_type;
97 static GstBinClass *parent_class = NULL;
98 static guint gst_thread_signals[LAST_SIGNAL] = { 0 };
101 gst_thread_get_type(void) {
102 static GType thread_type = 0;
105 static const GTypeInfo thread_info = {
106 sizeof(GstThreadClass),
109 (GClassInitFunc)gst_thread_class_init,
114 (GInstanceInitFunc)gst_thread_init,
117 thread_type = g_type_register_static(GST_TYPE_BIN, "GstThread", &thread_info, 0);
123 gst_thread_class_init (GstThreadClass *klass)
125 GObjectClass *gobject_class;
126 GstObjectClass *gstobject_class;
127 GstElementClass *gstelement_class;
128 GstBinClass *gstbin_class;
130 gobject_class = (GObjectClass*)klass;
131 gstobject_class = (GstObjectClass*)klass;
132 gstelement_class = (GstElementClass*)klass;
133 gstbin_class = (GstBinClass*)klass;
135 parent_class = g_type_class_ref (GST_TYPE_BIN);
137 g_object_class_install_property(G_OBJECT_CLASS (klass), ARG_SCHEDPOLICY,
138 g_param_spec_enum("schedpolicy", "Scheduling Policy", "The scheduling policy of the thread",
139 GST_TYPE_THREAD_SCHEDPOLICY, SCHED_OTHER, G_PARAM_READWRITE));
140 g_object_class_install_property(G_OBJECT_CLASS (klass), ARG_PRIORITY,
141 g_param_spec_int("priority", "Scheduling Priority", "The scheduling priority of the thread",
142 0, 99, 0, G_PARAM_READWRITE));
144 gst_thread_signals[SHUTDOWN] =
145 g_signal_new ("shutdown", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
146 G_STRUCT_OFFSET (GstThreadClass, shutdown), NULL, NULL,
147 gst_marshal_VOID__VOID, G_TYPE_NONE, 0);
149 gobject_class->dispose = gst_thread_dispose;
151 #ifndef GST_DISABLE_LOADSAVE
152 gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_thread_save_thyself);
153 gstobject_class->restore_thyself = GST_DEBUG_FUNCPTR (gst_thread_restore_thyself);
156 gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_thread_change_state);
158 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_thread_set_property);
159 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_thread_get_property);
164 gst_thread_init (GstThread *thread)
166 GstScheduler *scheduler;
168 GST_DEBUG (GST_CAT_THREAD, "initializing thread");
170 /* threads are managing bins and iterate themselves */
171 /* CR1: the GstBin code checks these flags */
172 GST_FLAG_SET (thread, GST_BIN_FLAG_MANAGER);
173 GST_FLAG_SET (thread, GST_BIN_SELF_SCHEDULABLE);
175 scheduler = gst_scheduler_factory_make (NULL, GST_ELEMENT (thread));
177 thread->lock = g_mutex_new ();
178 thread->cond = g_cond_new ();
180 thread->ppid = getpid ();
181 thread->thread_id = (pthread_t) -1;
182 thread->sched_policy = SCHED_OTHER;
183 thread->priority = 0;
184 thread->stack = NULL;
188 gst_thread_dispose (GObject *object)
190 GstThread *thread = GST_THREAD (object);
192 GST_DEBUG (GST_CAT_REFCOUNTING, "dispose");
194 g_mutex_free (thread->lock);
195 g_cond_free (thread->cond);
197 G_OBJECT_CLASS (parent_class)->dispose (object);
199 if (GST_ELEMENT_SCHED (thread)) {
200 gst_object_unref (GST_OBJECT (GST_ELEMENT_SCHED (thread)));
205 gst_thread_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
209 /* it's not null if we got it, but it might not be ours */
210 g_return_if_fail (GST_IS_THREAD (object));
212 thread = GST_THREAD (object);
215 case ARG_SCHEDPOLICY:
216 thread->sched_policy = g_value_get_enum (value);
219 thread->priority = g_value_get_int (value);
222 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
228 gst_thread_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
232 /* it's not null if we got it, but it might not be ours */
233 g_return_if_fail (GST_IS_THREAD (object));
235 thread = GST_THREAD (object);
238 case ARG_SCHEDPOLICY:
239 g_value_set_enum (value, thread->sched_policy);
242 g_value_set_int (value, thread->priority);
245 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
253 * @name: the name of the thread
255 * Create a new thread with the given name.
257 * Returns: The new thread
260 gst_thread_new (const gchar *name)
262 return gst_element_factory_make ("thread", name);
265 /* these two macros are used for debug/info from the state_change function */
267 #define THR_INFO(format,args...) \
268 GST_INFO_ELEMENT(GST_CAT_THREAD, thread, "sync(" GST_DEBUG_THREAD_FORMAT "): " format , \
269 GST_DEBUG_THREAD_ARGS(thread->pid) , ## args )
271 #define THR_DEBUG(format,args...) \
272 GST_DEBUG_ELEMENT(GST_CAT_THREAD, thread, "sync(" GST_DEBUG_THREAD_FORMAT "): " format , \
273 GST_DEBUG_THREAD_ARGS(thread->pid) , ## args )
275 /* these two macros are used for debug/info from the gst_thread_main_loop
279 #define THR_INFO_MAIN(format,args...) \
280 GST_INFO_ELEMENT(GST_CAT_THREAD, thread, "sync-main(" GST_DEBUG_THREAD_FORMAT "): " format , \
281 GST_DEBUG_THREAD_ARGS(thread->ppid) , ## args )
283 #define THR_DEBUG_MAIN(format,args...) \
284 GST_DEBUG_ELEMENT(GST_CAT_THREAD, thread, "sync-main(" GST_DEBUG_THREAD_FORMAT "): " format , \
285 GST_DEBUG_THREAD_ARGS(thread->ppid) , ## args )
287 static GstElementStateReturn
288 gst_thread_update_state (GstThread *thread)
290 GST_DEBUG_ELEMENT (GST_CAT_THREAD, thread, "updating state of thread");
291 /* check for state change */
292 if (GST_STATE_PENDING (thread) != GST_STATE_VOID_PENDING) {
293 /* punt and change state on all the children */
294 if (GST_ELEMENT_CLASS (parent_class)->change_state)
295 return GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT (thread));
298 /* FIXME: in the case of no change_state function in the parent's class,
299 * shouldn't we actually change the thread's state ? */
300 g_warning ("thread's parent doesn't have change_state, returning success");
301 return GST_STATE_SUCCESS;
305 static GstElementStateReturn
306 gst_thread_change_state (GstElement * element)
309 gboolean stateset = GST_STATE_SUCCESS;
311 pthread_t self = pthread_self ();
314 g_return_val_if_fail (GST_IS_THREAD (element), GST_STATE_FAILURE);
315 g_return_val_if_fail (gst_has_threads (), GST_STATE_FAILURE);
317 thread = GST_THREAD (element);
319 transition = GST_STATE_TRANSITION (element);
321 THR_INFO ("changing state from %s to %s",
322 gst_element_state_get_name (GST_STATE (element)),
323 gst_element_state_get_name (GST_STATE_PENDING (element)));
325 if (pthread_equal (self, thread->thread_id)) {
326 GST_DEBUG (GST_CAT_THREAD,
327 "no sync(" GST_DEBUG_THREAD_FORMAT "): setting own thread's state to spinning",
328 GST_DEBUG_THREAD_ARGS (thread->pid));
329 return gst_thread_update_state (thread);
332 switch (transition) {
333 case GST_STATE_NULL_TO_READY:
334 /* set the state to idle */
335 GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
337 THR_DEBUG ("creating thread \"%s\"", GST_ELEMENT_NAME (element));
339 /* this bit of code handles creation of pthreads
340 * this is therefor tricky code
341 * compare it with the block of code that handles the destruction
342 * in GST_STATE_READY_TO_NULL below
344 g_mutex_lock (thread->lock);
346 /* create attribute struct for pthread
347 * and assign stack pointer and size to it
349 * the default state of a pthread is PTHREAD_CREATE_JOINABLE
350 * (see man pthread_attr_init)
351 * - other thread can sync on termination
352 * - thread resources are kept allocated until other thread performs
356 if (pthread_attr_init (&thread->attr) != 0)
357 g_warning ("pthread_attr_init returned an error !");
359 /* this function should return a newly allocated stack
360 * (using whatever method)
361 * which we can initiate the pthreads with
362 * the stack should be freed in
364 if (gst_scheduler_get_preferred_stack (GST_ELEMENT_SCHED (element),
365 &thread->stack, &stacksize)) {
366 #ifdef HAVE_PTHREAD_ATTR_SETSTACK
367 if (pthread_attr_setstack (&thread->attr,
368 thread->stack, stacksize) != 0) {
369 g_warning ("pthread_attr_setstack failed\n");
370 return GST_STATE_FAILURE;
373 if (pthread_attr_setstackaddr (&thread->attr, thread->stack) != 0) {
374 g_warning ("pthread_attr_setstackaddr failed\n");
375 return GST_STATE_FAILURE;
377 if (pthread_attr_setstacksize (&thread->attr, stacksize) != 0) {
378 g_warning ("pthread_attr_setstacksize failed\n");
379 return GST_STATE_FAILURE;
382 GST_DEBUG (GST_CAT_THREAD, "pthread attr set stack at %p of size %ld",
383 thread->stack, stacksize);
386 g_warning ("scheduler did not return a preferred stack");
389 /* create a new pthread
390 * use the specified attributes
391 * make it execute gst_thread_main_loop (thread)
393 GST_DEBUG (GST_CAT_THREAD, "going to pthread_create...");
394 if (pthread_create (&thread->thread_id, &thread->attr,
395 gst_thread_main_loop, thread) != 0) {
396 GST_DEBUG (GST_CAT_THREAD, "pthread_create failed");
397 g_mutex_unlock (thread->lock);
398 GST_DEBUG (GST_CAT_THREAD, "could not create thread \"%s\"",
399 GST_ELEMENT_NAME (element));
400 return GST_STATE_FAILURE;
402 GST_DEBUG (GST_CAT_THREAD, "pthread created");
404 /* wait for it to 'spin up' */
405 THR_DEBUG ("waiting for child thread spinup");
406 g_cond_wait (thread->cond, thread->lock);
407 THR_DEBUG ("thread claims to be up");
408 g_mutex_unlock (thread->lock);
410 case GST_STATE_READY_TO_PAUSED:
411 THR_INFO ("readying thread");
412 g_mutex_lock (thread->lock);
413 THR_DEBUG ("signaling");
414 g_cond_signal (thread->cond);
415 THR_DEBUG ("waiting for ack");
416 g_cond_wait (thread->cond, thread->lock);
417 THR_DEBUG ("got ack");
418 g_mutex_unlock (thread->lock);
420 case GST_STATE_PAUSED_TO_PLAYING:
422 /* fixme: recurse into sub-bins */
423 const GList *elements = gst_bin_get_list (GST_BIN (thread));
425 gst_element_enable_threadsafe_properties ((GstElement*)elements->data);
426 elements = g_list_next (elements);
429 THR_DEBUG ("telling thread to start spinning");
430 g_mutex_lock (thread->lock);
431 THR_DEBUG ("signaling");
432 g_cond_signal (thread->cond);
433 THR_DEBUG ("waiting for ack");
434 g_cond_wait (thread->cond, thread->lock);
435 THR_DEBUG ("got ack");
436 g_mutex_unlock (thread->lock);
439 case GST_STATE_PLAYING_TO_PAUSED:
441 const GList *elements = (GList *) gst_bin_get_list (GST_BIN (thread));
443 THR_INFO ("pausing thread");
445 /* the following code ensures that the bottom half of thread will run
446 * to perform each elements' change_state() (by calling gstbin.c::
448 * + the pending state was already set by gstelement.c::set_state()
449 * + unlock all elements so the bottom half can start the state change.
451 g_mutex_lock (thread->lock);
453 GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
456 GstElement *element = GST_ELEMENT (elements->data);
461 THR_DEBUG (" waking element \"%s\"", GST_ELEMENT_NAME (element));
462 elements = g_list_next (elements);
464 if (!gst_element_release_locks (element)) {
465 g_warning ("element %s could not release locks", GST_ELEMENT_NAME (element));
468 pads = GST_ELEMENT_PADS (element);
471 GstRealPad *peer = GST_REAL_PAD (GST_PAD_PEER (pads->data));
472 GstElement *peerelement;
474 pads = g_list_next (pads);
479 peerelement = GST_PAD_PARENT (peer);
481 continue; /* deal with case where there's no peer */
483 if (!GST_FLAG_IS_SET (peerelement, GST_ELEMENT_DECOUPLED)) {
484 GST_DEBUG (GST_CAT_THREAD, "peer element isn't DECOUPLED");
488 if (GST_ELEMENT_SCHED (peerelement) != GST_ELEMENT_SCHED (thread)) {
489 THR_DEBUG (" element \"%s\" has pad cross sched boundary", GST_ELEMENT_NAME (element));
490 THR_DEBUG (" waking element \"%s\"", GST_ELEMENT_NAME (peerelement));
491 if (!gst_element_release_locks (peerelement)) {
492 g_warning ("element %s could not release locks", GST_ELEMENT_NAME (peerelement));
498 THR_DEBUG ("telling thread to pause, signaling");
499 g_cond_signal (thread->cond);
500 THR_DEBUG ("waiting for ack");
501 g_cond_wait (thread->cond, thread->lock);
502 THR_DEBUG ("got ack");
503 g_mutex_unlock (thread->lock);
505 elements = gst_bin_get_list (GST_BIN (thread));
507 gst_element_disable_threadsafe_properties ((GstElement*)elements->data);
508 elements = g_list_next (elements);
512 case GST_STATE_READY_TO_NULL:
513 THR_DEBUG ("telling thread to pause (null) - and joining");
514 /* MattH FIXME revisit */
515 g_mutex_lock (thread->lock);
516 THR_DEBUG ("signaling");
517 g_cond_signal (thread->cond);
518 THR_DEBUG ("waiting for ack");
519 g_cond_wait (thread->cond, thread->lock);
520 THR_DEBUG ("got ack");
522 /* this block of code is very tricky
523 * basically, we try to clean up the whole thread and
524 * everything related to it in the right order without
525 * triggering segfaults
526 * compare this block to the block
530 /* in glibc 2.2.5, pthread_attr_destroy does nothing more
532 if (pthread_attr_destroy (&thread->attr) != 0)
533 g_warning ("pthread_attr_destroy has failed !");
535 GST_DEBUG (GST_CAT_THREAD, "joining pthread %ld", thread->thread_id);
536 if (pthread_join (thread->thread_id, NULL) != 0)
537 g_warning ("pthread_join has failed !\n");
539 thread->thread_id = -1;
541 /* the stack was allocated when we created the thread
542 * using scheduler->get_preferred_stack */
544 GST_DEBUG (GST_CAT_THREAD, "freeing allocated stack (%p)",
546 free (thread->stack);
547 thread->stack = NULL;
550 THR_DEBUG ("unlocking mutex");
551 g_mutex_unlock (thread->lock);
553 GST_FLAG_UNSET (thread, GST_THREAD_STATE_REAPING);
554 GST_FLAG_UNSET (thread, GST_THREAD_STATE_STARTED);
555 GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
558 case GST_STATE_PAUSED_TO_READY:
559 THR_DEBUG ("telling thread to stop spinning");
560 g_mutex_lock (thread->lock);
561 THR_DEBUG ("signaling");
562 g_cond_signal (thread->cond);
563 THR_DEBUG ("waiting for ack");
564 g_cond_wait (thread->cond, thread->lock);
565 THR_DEBUG ("got ack");
566 g_mutex_unlock (thread->lock);
570 GST_DEBUG_ELEMENT (GST_CAT_THREAD, element, "UNHANDLED STATE CHANGE! %x", transition);
578 * gst_thread_main_loop:
579 * @arg: the thread to start
581 * The main loop of the thread. The thread will iterate
582 * while the state is GST_THREAD_STATE_SPINNING.
585 gst_thread_main_loop (void *arg)
587 GstThread *thread = NULL;
590 GST_DEBUG (GST_CAT_THREAD, "gst_thread_main_loop started");
591 thread = GST_THREAD (arg);
592 g_mutex_lock (thread->lock);
594 /* handle scheduler policy; do stuff if not the normal scheduler */
595 if (thread->sched_policy != SCHED_OTHER) {
596 struct sched_param sched_param;
598 memset (&sched_param, 0, sizeof (sched_param));
599 if (thread->priority == 0) {
600 thread->priority = sched_get_priority_max (thread->sched_policy);
602 sched_param.sched_priority = thread->priority;
604 if (sched_setscheduler (0, thread->sched_policy, &sched_param) != 0) {
605 GST_DEBUG (GST_CAT_THREAD, "not running with real-time priority");
609 /* set up the element's scheduler */
610 gst_scheduler_setup (GST_ELEMENT_SCHED (thread));
611 GST_FLAG_UNSET (thread, GST_THREAD_STATE_REAPING);
613 thread->pid = getpid();
614 THR_INFO_MAIN ("thread is running");
616 /* first we need to change the state of all the children */
617 if (GST_ELEMENT_CLASS (parent_class)->change_state) {
618 stateset = GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT(thread));
620 if (stateset != GST_STATE_SUCCESS) {
621 THR_DEBUG_MAIN ("state change of children failed");
625 THR_DEBUG_MAIN ("indicating spinup");
626 g_cond_signal (thread->cond);
627 /* don't unlock the mutex because we hold it into the top of the while loop */
628 THR_DEBUG_MAIN ("thread has indicated spinup to parent process");
630 /***** THREAD IS NOW IN READY STATE *****/
632 /* CR1: most of this code is handshaking */
633 /* do this while the thread lives */
634 while (!GST_FLAG_IS_SET (thread, GST_THREAD_STATE_REAPING)) {
635 /* NOTE we hold the thread lock at this point */
636 /* what we do depends on what state we're in */
637 switch (GST_STATE (thread)) {
638 /* NOTE: cannot be in NULL, we're not running in that state at all */
639 case GST_STATE_READY:
640 /* wait to be set to either the NULL or PAUSED states */
641 THR_DEBUG_MAIN ("thread in %s state, waiting for either %s or %s",
642 gst_element_state_get_name (GST_STATE_READY),
643 gst_element_state_get_name (GST_STATE_NULL),
644 gst_element_state_get_name (GST_STATE_PAUSED));
645 g_cond_wait (thread->cond, thread->lock);
647 /* this must have happened by a state change in the thread context */
648 if (GST_STATE_PENDING (thread) != GST_STATE_NULL &&
649 GST_STATE_PENDING (thread) != GST_STATE_PAUSED) {
650 g_cond_signal (thread->cond);
654 /* been signaled, we need to state transition now and signal back */
655 gst_thread_update_state (thread);
656 THR_DEBUG_MAIN ("done with state transition, "
657 "signaling back to parent process");
658 g_cond_signal (thread->cond);
659 /* now we decide what to do next */
660 if (GST_STATE (thread) == GST_STATE_NULL) {
661 /* REAPING must be set, we can simply break this iteration */
662 THR_DEBUG_MAIN ("set GST_THREAD_STATE_REAPING");
663 GST_FLAG_SET (thread, GST_THREAD_STATE_REAPING);
667 case GST_STATE_PAUSED:
668 /* wait to be set to either the READY or PLAYING states */
669 THR_DEBUG_MAIN ("thread in %s state, waiting for either %s or %s",
670 gst_element_state_get_name (GST_STATE_PAUSED),
671 gst_element_state_get_name (GST_STATE_READY),
672 gst_element_state_get_name (GST_STATE_PLAYING));
673 g_cond_wait (thread->cond, thread->lock);
675 /* this must have happened by a state change in the thread context */
676 if (GST_STATE_PENDING (thread) != GST_STATE_READY &&
677 GST_STATE_PENDING (thread) != GST_STATE_PLAYING) {
678 g_cond_signal (thread->cond);
682 /* been signaled, we need to state transition now and signal back */
683 gst_thread_update_state (thread);
684 /* now we decide what to do next */
685 if (GST_STATE (thread) != GST_STATE_PLAYING) {
686 /* either READY or the state change failed for some reason */
687 g_cond_signal (thread->cond);
691 GST_FLAG_SET (thread, GST_THREAD_STATE_SPINNING);
692 /* PLAYING is coming up, so we can now start spinning */
693 while (GST_FLAG_IS_SET (thread, GST_THREAD_STATE_SPINNING)) {
696 g_cond_signal (thread->cond);
697 g_mutex_unlock (thread->lock);
698 status = gst_bin_iterate (GST_BIN (thread));
699 g_mutex_lock (thread->lock);
700 /* g_cond_signal(thread->cond); */
702 if (!status || GST_STATE_PENDING (thread) != GST_STATE_VOID_PENDING)
703 GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
705 /* looks like we were stopped because of a statechange */
706 if (GST_STATE_PENDING (thread)) {
707 gst_thread_update_state (thread);
709 /* once we're here, SPINNING has stopped, we should signal that we're done */
710 THR_DEBUG_MAIN ("SPINNING stopped, signaling back to parent process");
711 g_cond_signal (thread->cond);
712 /* now we can wait for PAUSED */
715 case GST_STATE_PLAYING:
716 /* wait to be set to PAUSED */
717 THR_DEBUG_MAIN ("thread in %s state, waiting for %s",
718 gst_element_state_get_name (GST_STATE_PLAYING),
719 gst_element_state_get_name (GST_STATE_PAUSED));
720 g_cond_wait (thread->cond,thread->lock);
722 /* been signaled, we need to state transition now and signal back */
723 gst_thread_update_state (thread);
724 g_cond_signal (thread->cond);
725 /* now we decide what to do next */
726 /* there's only PAUSED, we we just wait for it */
729 THR_DEBUG_MAIN ("thread in %s state, preparing to die",
730 gst_element_state_get_name (GST_STATE_NULL));
731 GST_FLAG_SET (thread, GST_THREAD_STATE_REAPING);
734 g_assert_not_reached ();
739 /* THREAD HAS STOPPED RUNNING */
741 /* we need to destroy the scheduler here because it has mapped it's
742 * stack into the threads stack space */
743 gst_scheduler_reset (GST_ELEMENT_SCHED (thread));
745 /* since we don't unlock at the end of the while loop, do it here */
746 g_mutex_unlock (thread->lock);
748 GST_INFO (GST_CAT_THREAD, "gstthread: thread \"%s\" is stopped",
749 GST_ELEMENT_NAME (thread));
751 g_signal_emit (G_OBJECT (thread), gst_thread_signals[SHUTDOWN], 0);
756 #ifndef GST_DISABLE_LOADSAVE
758 gst_thread_save_thyself (GstObject *object,
761 if (GST_OBJECT_CLASS (parent_class)->save_thyself)
762 GST_OBJECT_CLASS (parent_class)->save_thyself (object, self);
767 gst_thread_restore_thyself (GstObject *object,
770 GST_DEBUG (GST_CAT_THREAD,"gstthread: restore");
772 if (GST_OBJECT_CLASS (parent_class)->restore_thyself)
773 GST_OBJECT_CLASS (parent_class)->restore_thyself (object, self);
775 #endif /* GST_DISABLE_LOADSAVE */