gstreamer/gst/gstthread.c
Joshua N. Pritikin ef37a388d0 make gst_thread_change_state more forgiving
Original commit message from CVS:
make gst_thread_change_state more forgiving
2001-09-14 05:02:27 +00:00

719 lines
24 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstthread.c: Threaded container object
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <unistd.h>
//#define GST_DEBUG_ENABLED
#include "gst_private.h"
#include "gstthread.h"
#include "gstscheduler.h"
#include "gstqueue.h"
GstElementDetails gst_thread_details = {
"Threaded container",
"Bin",
"Container that creates/manages a thread",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999, 2000",
};
/* Thread signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
SPINUP=0,
STATECHANGE,
STARTUP
};
enum {
ARG_0,
ARG_CREATE_THREAD,
};
static void gst_thread_class_init (GstThreadClass *klass);
static void gst_thread_init (GstThread *thread);
static void gst_thread_real_destroy (GObject *object);
static void gst_thread_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_thread_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static GstElementStateReturn gst_thread_change_state (GstElement *element);
#ifndef GST_DISABLE_LOADSAVE
static xmlNodePtr gst_thread_save_thyself (GstObject *object, xmlNodePtr parent);
static void gst_thread_restore_thyself (GstObject *object, xmlNodePtr self);
#endif
static void gst_thread_signal_thread (GstThread *thread, gboolean spinning);
static void* gst_thread_main_loop (void *arg);
static GstBinClass *parent_class = NULL;
//static guint gst_thread_signals[LAST_SIGNAL] = { 0 };
GType
gst_thread_get_type(void) {
static GType thread_type = 0;
if (!thread_type) {
static const GTypeInfo thread_info = {
sizeof(GstThreadClass),
NULL,
NULL,
(GClassInitFunc)gst_thread_class_init,
NULL,
NULL,
sizeof(GstThread),
4,
(GInstanceInitFunc)gst_thread_init,
};
thread_type = g_type_register_static(GST_TYPE_BIN, "GstThread", &thread_info, 0);
}
return thread_type;
}
static void
gst_thread_class_init (GstThreadClass *klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
GstElementClass *gstelement_class;
GstBinClass *gstbin_class;
gobject_class = (GObjectClass*)klass;
gstobject_class = (GstObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
gstbin_class = (GstBinClass*)klass;
parent_class = g_type_class_ref (GST_TYPE_BIN);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_CREATE_THREAD,
g_param_spec_boolean("create_thread", "Create Thread", "Whether to create a thread.",
TRUE,G_PARAM_READWRITE));
// FIXME!
// gobject_class->destroy = gst_thread_real_destroy;
#ifndef GST_DISABLE_LOADSAVE
gstobject_class->save_thyself = gst_thread_save_thyself;
gstobject_class->restore_thyself = gst_thread_restore_thyself;
#endif
gstelement_class->change_state = gst_thread_change_state;
// gstbin_class->schedule = gst_thread_schedule_dummy;
gobject_class->set_property = gst_thread_set_property;
gobject_class->get_property = gst_thread_get_property;
}
static void
gst_thread_init (GstThread *thread)
{
GST_DEBUG (GST_CAT_THREAD,"initializing thread\n");
// we're a manager by default
GST_FLAG_SET (thread, GST_BIN_FLAG_MANAGER);
// default is to create a thread
GST_FLAG_SET (thread, GST_THREAD_CREATE);
thread->lock = g_mutex_new();
thread->cond = g_cond_new();
GST_ELEMENT_SCHED(thread) = gst_schedule_new(GST_ELEMENT(thread));
GST_DEBUG(GST_CAT_THREAD, "thread's scheduler is %p\n",GST_ELEMENT_SCHED(thread));
thread->ppid = getpid();
// gst_element_set_manager(GST_ELEMENT(thread),GST_ELEMENT(thread));
}
static void
gst_thread_real_destroy (GObject *object)
{
GstThread *thread = GST_THREAD (object);
GST_DEBUG (GST_CAT_REFCOUNTING,"destroy()\n");
g_mutex_free (thread->lock);
g_cond_free (thread->cond);
// FIXME!
// if (G_OBJECT_CLASS (parent_class)->destroy)
// G_OBJECT_CLASS (parent_class)->destroy (object);
gst_object_destroy (GST_OBJECT (GST_ELEMENT_SCHED (thread)));
gst_object_unref (GST_OBJECT (GST_ELEMENT_SCHED (thread)));
}
static void
gst_thread_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_THREAD (object));
switch (prop_id) {
case ARG_CREATE_THREAD:
if (g_value_get_boolean(value)) {
GST_INFO (GST_CAT_THREAD,"turning ON the creation of the thread");
GST_FLAG_SET (object, GST_THREAD_CREATE);
// GST_DEBUG (GST_CAT_THREAD,"flags are 0x%08x\n", GST_FLAGS (object));
} else {
GST_INFO (GST_CAT_THREAD,"gstthread: turning OFF the creation of the thread");
GST_FLAG_UNSET (object, GST_THREAD_CREATE);
// GST_DEBUG (GST_CAT_THREAD,"gstthread: flags are 0x%08x\n", GST_FLAGS (object));
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_thread_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_THREAD (object));
switch (prop_id) {
case ARG_CREATE_THREAD:
g_value_set_boolean(value, GST_FLAG_IS_SET (object, GST_THREAD_CREATE));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gst_thread_new:
* @name: the name of the thread
*
* Create a new thread with the given name.
*
* Returns: The new thread
*/
GstElement*
gst_thread_new (const guchar *name)
{
return gst_elementfactory_make ("thread", name);
}
#define THR_INFO(format,args...) \
GST_INFO_ELEMENT(GST_CAT_THREAD, thread, "sync(" GST_DEBUG_THREAD_FORMAT "): " format , \
GST_DEBUG_THREAD_ARGS(thread->pid) , ## args )
#define THR_DEBUG(format,args...) \
GST_DEBUG_ELEMENT(GST_CAT_THREAD, thread, "sync(" GST_DEBUG_THREAD_FORMAT "): " format , \
GST_DEBUG_THREAD_ARGS(thread->pid) , ## args )
#define THR_INFO_MAIN(format,args...) \
GST_INFO_ELEMENT(GST_CAT_THREAD, thread, "sync-main(" GST_DEBUG_THREAD_FORMAT "): " format , \
GST_DEBUG_THREAD_ARGS(thread->ppid) , ## args )
#define THR_DEBUG_MAIN(format,args...) \
GST_DEBUG_ELEMENT(GST_CAT_THREAD, thread, "sync-main(" GST_DEBUG_THREAD_FORMAT "): " format , \
GST_DEBUG_THREAD_ARGS(thread->ppid) , ## args )
static GstElementStateReturn
gst_thread_change_state (GstElement *element)
{
GstThread *thread;
gboolean stateset = GST_STATE_SUCCESS;
gint transition;
pthread_t self = pthread_self();
g_return_val_if_fail (GST_IS_THREAD(element), FALSE);
// GST_DEBUG_ENTER("(\"%s\")",GST_ELEMENT_NAME(element));
thread = GST_THREAD (element);
// GST_DEBUG (GST_CAT_THREAD, "**** THREAD %ld changing THREAD %ld ****\n",self,thread->thread_id);
// GST_DEBUG (GST_CAT_THREAD, "**** current pid=%d\n",getpid());
transition = GST_STATE_TRANSITION (element);
THR_INFO("changing state from %s to %s",
gst_element_statename(GST_STATE (element)),
gst_element_statename(GST_STATE_PENDING (element)));
//GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
switch (transition) {
case GST_STATE_NULL_TO_READY:
// set the state to idle
GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
GST_FLAG_UNSET (thread, GST_THREAD_STATE_REAPING);
// create the thread if that's what we're supposed to do
if (GST_FLAG_IS_SET (thread, GST_THREAD_CREATE)) {
THR_DEBUG ("creating thread \"%s\"\n",
GST_ELEMENT_NAME (element));
g_mutex_lock (thread->lock);
// create the thread
pthread_create (&thread->thread_id, NULL,
gst_thread_main_loop, thread);
// wait for it to 'spin up'
THR_DEBUG("waiting for child thread spinup\n");
g_cond_wait(thread->cond,thread->lock);
THR_DEBUG("thread claims to be up\n");
g_mutex_unlock(thread->lock);
} else {
GST_INFO (GST_CAT_THREAD, "NOT creating thread \"%s\"",
GST_ELEMENT_NAME (GST_ELEMENT (element)));
// punt and change state on all the children
if (GST_ELEMENT_CLASS (parent_class)->change_state)
stateset = GST_ELEMENT_CLASS (parent_class)->change_state (element);
}
break;
case GST_STATE_READY_TO_PAUSED:
THR_INFO("readying thread");
// check to see if the thread is somehow changing its own state.
// FIXME this is currently illegal, but must somehow be made legal at some point.
if (pthread_equal(self, thread->thread_id))
{
//FIXME this should not happen
g_assert(!pthread_equal(self, thread->thread_id));
GST_FLAG_SET(thread, GST_THREAD_STATE_SPINNING);
GST_DEBUG(GST_CAT_THREAD,"no sync(" GST_DEBUG_THREAD_FORMAT "): setting own thread's state to spinning\n",
GST_DEBUG_THREAD_ARGS(thread->pid));
}
else
{
g_mutex_lock(thread->lock);
gst_thread_signal_thread(thread,FALSE);
}
break;
case GST_STATE_PAUSED_TO_PLAYING:
THR_INFO("starting thread");
// check to see if the thread is somehow changing its own state.
// FIXME this is currently illegal, but must somehow be made legal at some point.
if (pthread_equal(self, thread->thread_id))
{
//FIXME this should not happen
g_assert(!pthread_equal(self, thread->thread_id));
GST_FLAG_SET(thread, GST_THREAD_STATE_SPINNING);
GST_DEBUG(GST_CAT_THREAD,"no sync(" GST_DEBUG_THREAD_FORMAT "): setting own thread's state to spinning\n",
GST_DEBUG_THREAD_ARGS(thread->pid));
}
else
{
THR_DEBUG("telling thread to start spinning\n");
g_mutex_lock(thread->lock);
gst_thread_signal_thread(thread,TRUE);
}
break;
case GST_STATE_PLAYING_TO_PAUSED:
THR_INFO("pausing thread");
// check to see if the thread is somehow changing its own state.
// FIXME this is currently illegal, but must somehow be made legal at some point.
if (pthread_equal(self, thread->thread_id))
{
//FIXME this should not happen
GST_DEBUG(GST_CAT_THREAD,"no sync(" GST_DEBUG_THREAD_FORMAT "): setting own thread's state to paused\n",
GST_DEBUG_THREAD_ARGS(thread->pid));
GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
g_assert(!pthread_equal(self, thread->thread_id));
}
else
{
GList *elements = (element->sched)->elements;
// the following code ensures that the bottom half of thread will run
// to perform each elements' change_state() (by calling gstbin.c::
// change_state()).
// + the pending state was already set by gstelement.c::set_state()
// + find every queue we manage, and signal its empty and full conditions
g_mutex_lock(thread->lock);
GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
while (elements)
{
GstElement *e = GST_ELEMENT(elements->data);
g_assert(e);
THR_DEBUG(" element \"%s\"\n",GST_ELEMENT_NAME(e));
elements = g_list_next(elements);
if (GST_IS_QUEUE(e))
{
//FIXME make this more efficient by only waking queues that are asleep
//FIXME and only waking the appropriate condition (depending on if it's
//FIXME on up- or down-stream side)
//
//FIXME also make this more efficient by keeping list of managed queues
THR_DEBUG("waking queue \"%s\"\n",GST_ELEMENT_NAME(e));
GST_LOCK(e);
g_cond_signal((GST_QUEUE(e)->emptycond));
g_cond_signal((GST_QUEUE(e)->fullcond));
GST_UNLOCK(e);
}
else
{
GList *pads = GST_ELEMENT_PADS(e);
while (pads)
{
GstRealPad *peer;
GstElement *peerelement;
GstPad *p = GST_PAD(pads->data);
pads = g_list_next(pads);
peer = GST_PAD_PEER(p);
if (!peer) continue;
peerelement = GST_PAD_PARENT(peer);
if (!peerelement) continue; // deal with case where there's no peer
if (!GST_FLAG_IS_SET(peerelement,GST_ELEMENT_DECOUPLED)) {
GST_DEBUG(GST_CAT_THREAD,"peer element isn't DECOUPLED\n");
continue;
}
// FIXME this needs to go away eventually
if (!GST_IS_QUEUE(peerelement)) {
GST_DEBUG(GST_CAT_THREAD,"peer element isn't a Queue\n");
continue;
}
if (GST_ELEMENT_SCHED(peerelement) != GST_ELEMENT_SCHED(thread))
{
THR_DEBUG(" element \"%s\" has pad cross sched boundary\n",GST_ELEMENT_NAME(e));
GST_LOCK(peerelement);
g_cond_signal(GST_QUEUE(peerelement)->emptycond);
g_cond_signal(GST_QUEUE(peerelement)->fullcond);
GST_UNLOCK(peerelement);
}
}
}
}
THR_DEBUG("waiting for thread to stop spinning\n");
g_cond_wait (thread->cond, thread->lock);
THR_DEBUG("telling thread to pause\n");
gst_thread_signal_thread(thread,FALSE);
}
break;
case GST_STATE_READY_TO_NULL:
THR_INFO("stopping thread");
GST_FLAG_SET (thread, GST_THREAD_STATE_REAPING);
// check to see if the thread is somehow changing its own state.
// FIXME this is currently illegal, but must somehow be made legal at some point.
if (pthread_equal(self, thread->thread_id))
{
//FIXME this should not happen
g_assert(!pthread_equal(self, thread->thread_id));
THR_DEBUG("setting own thread's state to NULL (paused)\n");
GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
}
else
{
THR_DEBUG("telling thread to pause (null) - and joining\n");
//MattH FIXME revisit
g_mutex_lock(thread->lock);
gst_thread_signal_thread(thread,FALSE);
pthread_join(thread->thread_id,NULL);
}
GST_FLAG_UNSET(thread,GST_THREAD_STATE_REAPING);
GST_FLAG_UNSET(thread,GST_THREAD_STATE_STARTED);
GST_FLAG_UNSET(thread,GST_THREAD_STATE_SPINNING);
GST_FLAG_UNSET(thread,GST_THREAD_STATE_ELEMENT_CHANGED);
break;
case GST_STATE_PAUSED_TO_READY:
THR_INFO("stopping thread");
// check to see if the thread is somehow changing its own state.
// FIXME this is currently illegal, but must somehow be made legal at some point.
if (pthread_equal(self, thread->thread_id))
{
//FIXME this should not happen
g_assert(!pthread_equal(self, thread->thread_id));
GST_FLAG_SET(thread, GST_THREAD_STATE_SPINNING);
GST_DEBUG(GST_CAT_THREAD,"no sync(" GST_DEBUG_THREAD_FORMAT "): setting own thread's state to spinning\n",
GST_DEBUG_THREAD_ARGS(thread->pid));
}
else
{
THR_DEBUG("telling thread to stop spinning\n");
g_mutex_lock(thread->lock);
gst_thread_signal_thread(thread,FALSE);
}
break;
default:
GST_DEBUG_ELEMENT(GST_CAT_THREAD, element, "UNHANDLED STATE CHANGE! %x\n",transition);
break;
}
return stateset;
}
static void gst_thread_update_state (GstThread *thread)
{
// check for state change
if (GST_STATE_PENDING(thread) != GST_STATE_VOID_PENDING) {
// punt and change state on all the children
if (GST_ELEMENT_CLASS (parent_class)->change_state)
GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT(thread));
}
}
/**
* gst_thread_main_loop:
* @arg: the thread to start
*
* The main loop of the thread. The thread will iterate
* while the state is GST_THREAD_STATE_SPINNING
*/
static void *
gst_thread_main_loop (void *arg)
{
GstThread *thread = GST_THREAD (arg);
gint stateset;
thread->pid = getpid();
THR_INFO_MAIN("thread is running");
// first we need to change the state of all the children
if (GST_ELEMENT_CLASS (parent_class)->change_state)
stateset = GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT(thread));
// construct the plan and signal back
/* DEPRACATED for INCSCHED1
THR_DEBUG_MAIN("creating plan for thread\n");
if (GST_BIN_CLASS (parent_class)->schedule)
GST_BIN_CLASS (parent_class)->schedule (GST_BIN (thread));
*/
// THR_DEBUG_MAIN("indicating spinup\n");
g_mutex_lock (thread->lock);
g_cond_signal (thread->cond);
// don't unlock the mutex because we hold it into the top of the while loop
THR_DEBUG_MAIN("thread has indicated spinup to parent process\n");
/***** THREAD IS NOW IN READY STATE *****/
while (!GST_FLAG_IS_SET (thread, GST_THREAD_STATE_REAPING)) {
// NOTE we hold the thread lock at this point
// what we do depends on what state we're in
switch (GST_STATE(thread)) {
// NOTE: cannot be in NULL, we're not running in that state at all
case GST_STATE_READY:
// wait to be set to either the NULL or PAUSED states
THR_DEBUG_MAIN("thread in %s state, waiting for either %s or %s\n",
gst_element_statename(GST_STATE_READY),
gst_element_statename(GST_STATE_NULL),
gst_element_statename(GST_STATE_PAUSED));
g_cond_wait(thread->cond,thread->lock);
// been signaled, we need to state transition now and signal back
gst_thread_update_state(thread);
THR_DEBUG_MAIN("done with state transition, signaling back to parent process\n");
g_cond_signal(thread->cond);
// g_mutex_unlock(thread->lock);
// now we decide what to do next (FIXME can be collapsed to a continue)
if (GST_STATE(thread) == GST_STATE_NULL) {
// REAPING must be set, we can simply break this iteration
continue;
} else {
// PAUSED is the next state, we can wait for that next
continue;
}
break;
case GST_STATE_PAUSED:
// wait to be set to either the READY or PLAYING states
THR_DEBUG_MAIN("thread in %s state, waiting for either %s or %s\n",
gst_element_statename(GST_STATE_PAUSED),
gst_element_statename(GST_STATE_READY),
gst_element_statename(GST_STATE_PLAYING));
g_cond_wait(thread->cond,thread->lock);
// been signaled, we need to state transition now and signal back
gst_thread_update_state(thread);
g_cond_signal(thread->cond);
// g_mutex_unlock(thread->lock);
// now we decide what to do next
if (GST_STATE(thread) == GST_STATE_READY) {
// READY is the next state, we can wait for that next
continue;
} else {
g_mutex_unlock(thread->lock);
// PLAYING is coming up, so we can now start spinning
while (GST_FLAG_IS_SET (thread, GST_THREAD_STATE_SPINNING)) {
if (!gst_bin_iterate (GST_BIN (thread))) {
// GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
// THR_DEBUG_MAIN("removed spinning state due to failed iteration!\n");
// FIXME FIXME FIXME this is ugly!
THR_DEBUG_MAIN("iteration failed, something very wrong, spinning to let parent sync\n");
while (GST_FLAG_IS_SET(thread, GST_THREAD_STATE_SPINNING)) ;
}
}
g_mutex_lock(thread->lock);
// once we're here, SPINNING has stopped, we should signal that we're done
THR_DEBUG_MAIN("SPINNING stopped, signaling back to parent process\n");
g_cond_signal (thread->cond);
// now we can wait for PAUSED
continue;
}
break;
case GST_STATE_PLAYING:
// wait to be set to PAUSED
THR_DEBUG_MAIN("thread in %s state, waiting for %s\n",
gst_element_statename(GST_STATE_PLAYING),
gst_element_statename(GST_STATE_PAUSED));
g_cond_wait(thread->cond,thread->lock);
// been signaled, we need to state transition now and signal back
gst_thread_update_state(thread);
g_cond_signal(thread->cond);
// g_mutex_unlock(thread->lock);
// now we decide what to do next
// there's only PAUSED, we we just wait for it
continue;
break;
}
// need to grab the lock so we're ready for the top of the loop
// g_mutex_lock(thread->lock);
}
/*
while (!GST_FLAG_IS_SET (thread, GST_THREAD_STATE_REAPING)) {
// start out by waiting for a state change into spinning
THR_DEBUG_MAIN("waiting for signal from parent process (at top of while())\n");
g_cond_wait (thread->cond,thread->lock);
THR_DEBUG_MAIN("woken up with %s pending\n",gst_element_statename(GST_STATE(thread)));
// now is a good time to change the state of the children and the thread itself
gst_thread_update_state (thread);
THR_DEBUG_MAIN("done changing state, signaling back\n");
g_cond_signal (thread->cond);
g_mutex_unlock (thread->lock);
THR_DEBUG_MAIN("finished sycnronizing with main process\n");
while (GST_FLAG_IS_SET (thread, GST_THREAD_STATE_SPINNING)) {
if (!gst_bin_iterate (GST_BIN (thread))) {
GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
THR_DEBUG_MAIN("removed spinning state due to failed iteration!\n");
}
}
g_mutex_lock (thread->lock);
if (GST_STATE_PENDING(thread) == GST_STATE_PAUSED) {
// we've stopped spinning, because of PLAYING->PAUSED
THR_DEBUG_MAIN("SPINNING flag unset, signaling parent process we're stopped\n");
// we need to signal back that we've stopped spinning
g_cond_signal (thread->cond);
}
// THR_DEBUG_MAIN("signaling that the thread is out of the SPINNING loop\n");
// g_cond_signal (thread->cond);
// g_cond_wait (thread->cond, thread->lock);
// THR_DEBUG_MAIN("parent process has signaled at bottom of while\n");
// // now change the children's and thread's state
// gst_thread_update_state (thread);
// THR_DEBUG_MAIN("done changing state, signaling back to parent process\n");
// g_cond_signal (thread->cond);
// // don't release the mutex, we hold that into the top of the loop
// THR_DEBUG_MAIN("done syncing with parent process at bottom of while\n");
}
*/
// since we don't unlock at the end of the while loop, do it here
g_mutex_unlock (thread->lock);
GST_INFO (GST_CAT_THREAD, "gstthread: thread \"%s\" is stopped",
GST_ELEMENT_NAME (thread));
return NULL;
}
// the set flag is to say whether it should set TRUE or FALSE
//
// WARNING: this has synchronization built in! if you remove or add any
// locks, waits, signals, or unlocks you need to be sure they match the
// code above (in gst_thread_main_loop()). basically, don't change anything.
static void
gst_thread_signal_thread (GstThread *thread, gboolean spinning)
{
// set the spinning state
if (spinning) GST_FLAG_SET(thread,GST_THREAD_STATE_SPINNING);
else GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
THR_DEBUG("thread locked\n");
// g_mutex_lock(thread->lock);
// if (!spinning) {
// THR_DEBUG("waiting for spindown\n");
// g_cond_wait (thread->cond, thread->lock);
// }
THR_DEBUG("signaling\n");
g_cond_signal (thread->cond);
THR_DEBUG("waiting for ack\n");
g_cond_wait (thread->cond,thread->lock);
THR_DEBUG("got ack\n");
THR_DEBUG("unlocking\n");
g_mutex_unlock(thread->lock);
THR_DEBUG("unlocked\n");
}
#ifndef GST_DISABLE_LOADSAVE
static xmlNodePtr
gst_thread_save_thyself (GstObject *object,
xmlNodePtr self)
{
if (GST_OBJECT_CLASS (parent_class)->save_thyself)
GST_OBJECT_CLASS (parent_class)->save_thyself (object, self);
return NULL;
}
static void
gst_thread_restore_thyself (GstObject *object,
xmlNodePtr self)
{
GST_DEBUG (GST_CAT_THREAD,"gstthread: restore\n");
if (GST_OBJECT_CLASS (parent_class)->restore_thyself)
GST_OBJECT_CLASS (parent_class)->restore_thyself (object, self);
}
#endif // GST_DISABLE_LOADSAVE