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gstreamer/gst/gstthread.c
Erik Walthinsen aa743e581b Updates to DEBUG system: moved statename into gstelement.c, colorized the states: 
Original commit message from CVS:
Updates to DEBUG system: moved statename into gstelement.c, colorized the
states:

NULL: white
READY: read
PAUSED: yellow
PLAYING: green
2001-05-21 23:23:39 +00:00

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18 KiB
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/* 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 (GtkObject *gtk_object);
static void gst_thread_set_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_thread_get_arg (GtkObject *object, GtkArg *arg, guint id);
static GstElementStateReturn gst_thread_change_state (GstElement *element);
static xmlNodePtr gst_thread_save_thyself (GstObject *object, xmlNodePtr parent);
static void gst_thread_restore_thyself (GstObject *object, xmlNodePtr self);
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 };
GtkType
gst_thread_get_type(void) {
static GtkType thread_type = 0;
if (!thread_type) {
static const GtkTypeInfo thread_info = {
"GstThread",
sizeof(GstThread),
sizeof(GstThreadClass),
(GtkClassInitFunc)gst_thread_class_init,
(GtkObjectInitFunc)gst_thread_init,
(GtkArgSetFunc)NULL,
(GtkArgGetFunc)NULL,
(GtkClassInitFunc)NULL,
};
thread_type = gtk_type_unique(GST_TYPE_BIN,&thread_info);
}
return thread_type;
}
static void
gst_thread_class_init (GstThreadClass *klass)
{
GtkObjectClass *gtkobject_class;
GstObjectClass *gstobject_class;
GstElementClass *gstelement_class;
GstBinClass *gstbin_class;
gtkobject_class = (GtkObjectClass*)klass;
gstobject_class = (GstObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
gstbin_class = (GstBinClass*)klass;
parent_class = gtk_type_class (GST_TYPE_BIN);
gtk_object_add_arg_type ("GstThread::create_thread", GTK_TYPE_BOOL,
GTK_ARG_READWRITE, ARG_CREATE_THREAD);
gtkobject_class->destroy = gst_thread_real_destroy;
gstobject_class->save_thyself = gst_thread_save_thyself;
gstobject_class->restore_thyself = gst_thread_restore_thyself;
gstelement_class->change_state = gst_thread_change_state;
// gstbin_class->schedule = gst_thread_schedule_dummy;
gtkobject_class->set_arg = gst_thread_set_arg;
gtkobject_class->get_arg = gst_thread_get_arg;
}
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));
// gst_element_set_manager(GST_ELEMENT(thread),GST_ELEMENT(thread));
}
static void
gst_thread_real_destroy (GtkObject *gtk_object)
{
GstThread *thread = GST_THREAD (gtk_object);
GST_DEBUG (GST_CAT_REFCOUNTING,"destroy()\n");
g_mutex_free (thread->lock);
g_cond_free (thread->cond);
if (GTK_OBJECT_CLASS (parent_class)->destroy)
GTK_OBJECT_CLASS (parent_class)->destroy (gtk_object);
gst_object_destroy (GST_OBJECT (GST_ELEMENT_SCHED (thread)));
gst_object_unref (GST_OBJECT (GST_ELEMENT_SCHED (thread)));
}
static void
gst_thread_set_arg (GtkObject *object,
GtkArg *arg,
guint id)
{
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_THREAD (object));
switch(id) {
case ARG_CREATE_THREAD:
if (GTK_VALUE_BOOL (*arg)) {
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:
break;
}
}
static void
gst_thread_get_arg (GtkObject *object,
GtkArg *arg,
guint id)
{
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_THREAD (object));
switch (id) {
case ARG_CREATE_THREAD:
GTK_VALUE_BOOL (*arg) = GST_FLAG_IS_SET (object, GST_THREAD_CREATE);
break;
default:
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);
}
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);
GST_INFO (GST_CAT_THREAD,"thread \"%s\" changing state to %s from %s",
GST_ELEMENT_NAME (GST_ELEMENT (element)),
gst_element_statename(GST_STATE_PENDING (element)),
gst_element_statename(GST_STATE (element)));
//GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
switch (transition) {
case GST_STATE_NULL_TO_READY:
// we want to prepare our internal state for doing the iterations
GST_INFO (GST_CAT_THREAD, "preparing thread \"%s\" for iterations:",
GST_ELEMENT_NAME (GST_ELEMENT (element)));
// set the state to idle
GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
// create the thread if that's what we're supposed to do
// GST_INFO (GST_CAT_THREAD, "flags are 0x%08x", GST_FLAGS (thread));
if (GST_FLAG_IS_SET (thread, GST_THREAD_CREATE)) {
GST_DEBUG (GST_CAT_THREAD, "creating thread \"%s\"\n",
GST_ELEMENT_NAME (GST_ELEMENT (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'
GST_DEBUG (GST_CAT_THREAD, "sync: waiting for spinup\n");
g_cond_wait(thread->cond,thread->lock);
GST_DEBUG (GST_CAT_THREAD, "sync: thread claims to be up\n");
g_mutex_unlock(thread->lock);
} else {
GST_INFO (GST_CAT_THREAD, "NOT starting 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_PAUSED_TO_PLAYING:
case GST_STATE_READY_TO_PLAYING:
// if (!stateset) return FALSE;
GST_INFO (GST_CAT_THREAD, "starting thread \"%s\"",
GST_ELEMENT_NAME (GST_ELEMENT (element)));
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: setting own thread's state to spinning\n");
}
else
{
GST_DEBUG(GST_CAT_THREAD,"sync: telling thread to start spinning\n");
g_mutex_lock(thread->lock);
gst_thread_signal_thread(thread,TRUE);
}
break;
case GST_STATE_PLAYING_TO_PAUSED:
GST_INFO (GST_CAT_THREAD,"pausing thread \"%s\"",
GST_ELEMENT_NAME (GST_ELEMENT (element)));
if (pthread_equal(self, thread->thread_id))
{
//FIXME this should not happen
g_assert(!pthread_equal(self, thread->thread_id));
GST_DEBUG(GST_CAT_THREAD,"no sync: setting own thread's state to paused\n");
GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
}
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);
while (elements)
{
GstElement *e = GST_ELEMENT(elements->data);
g_assert(e);
GST_DEBUG(GST_CAT_THREAD," 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
GST_DEBUG(GST_CAT_THREAD,"sync: waking queue \"%s\"\n",
GST_ELEMENT_NAME(e));
g_cond_signal((GST_QUEUE(e)->emptycond));
g_cond_signal((GST_QUEUE(e)->fullcond));
}
else
{
GList *pads = GST_ELEMENT_PADS(e);
while (pads)
{
GstPad *p = GST_PAD(pads->data);
pads = g_list_next(pads);
if (GST_IS_REAL_PAD(p) &&
GST_ELEMENT_SCHED(e) != GST_ELEMENT_SCHED(GST_ELEMENT(GST_PAD_PARENT(GST_PAD_PEER(p)))))
{
GST_DEBUG(GST_CAT_THREAD," element \"%s\" has pad cross sched boundary\n",GST_ELEMENT_NAME(e));
// FIXME i assume this signals our own (current) thread so don't need to lock
// FIXME however, this *may* go to yet another thread for which we need locks
// FIXME i'm too tired to deal with this now
g_cond_signal(GST_QUEUE(GST_ELEMENT(GST_PAD_PARENT(GST_PAD_PEER(p))))->emptycond);
g_cond_signal(GST_QUEUE(GST_ELEMENT(GST_PAD_PARENT(GST_PAD_PEER(p))))->fullcond);
}
}
}
}
GST_DEBUG(GST_CAT_THREAD,"sync: telling thread to pause\n");
gst_thread_signal_thread(thread,FALSE);
}
break;
case GST_STATE_PLAYING_TO_READY:
if (pthread_equal(self, thread->thread_id))
{
//FIXME this should not happen
g_assert(!pthread_equal(self, thread->thread_id));
GST_DEBUG(GST_CAT_THREAD,"no sync: setting own thread's state to ready (paused)\n");
GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
}
else
{
GST_DEBUG(GST_CAT_THREAD,"sync: telling thread to pause (ready)\n");
g_mutex_lock(thread->lock);
gst_thread_signal_thread(thread,FALSE);
}
break;
case GST_STATE_READY_TO_NULL:
GST_INFO (GST_CAT_THREAD,"stopping thread \"%s\"",
GST_ELEMENT_NAME (GST_ELEMENT (element)));
GST_FLAG_SET (thread, GST_THREAD_STATE_REAPING);
if (pthread_equal(self, thread->thread_id))
{
//FIXME this should not happen
g_assert(!pthread_equal(self, thread->thread_id));
GST_DEBUG(GST_CAT_THREAD,"no sync: setting own thread's state to NULL (paused)\n");
GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
}
else
{
GST_DEBUG(GST_CAT_THREAD,"sync: 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);
if (GST_ELEMENT_CLASS (parent_class)->change_state)
stateset = GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT(thread));
break;
default:
break;
}
return stateset;
}
static void gst_thread_update_state (GstThread *thread)
{
// check for state change
if (GST_STATE_PENDING(thread) != GST_STATE_NONE_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;
GST_INFO (GST_CAT_THREAD,"thread \"%s\" is running with PID %d",
GST_ELEMENT_NAME (GST_ELEMENT (thread)), getpid ());
// first we need to change the state of all the children
GST_DEBUG (GST_CAT_THREAD,"thread started, setting children's state\n");
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
GST_DEBUG (GST_CAT_THREAD,"creating plan for thread\n");
if (GST_BIN_CLASS (parent_class)->schedule)
GST_BIN_CLASS (parent_class)->schedule (GST_BIN (thread));
GST_DEBUG (GST_CAT_THREAD, "sync: 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
GST_DEBUG (GST_CAT_THREAD, "sync: thread has indicated spinup to main process\n");
while (!GST_FLAG_IS_SET (thread, GST_THREAD_STATE_REAPING)) {
// start out by waiting for a state change into spinning
GST_DEBUG (GST_CAT_THREAD, "sync: waiting at top of while for signal from main process\n");
g_cond_wait (thread->cond,thread->lock);
GST_DEBUG (GST_CAT_THREAD, "sync: main process has signaled at top of while\n");
// now is a good time to change the state of the children and the thread itself
gst_thread_update_state (thread);
GST_DEBUG (GST_CAT_THREAD, "sync: done changing state, signaling back\n");
g_cond_signal (thread->cond);
g_mutex_unlock (thread->lock);
GST_DEBUG (GST_CAT_THREAD, "sync: done syncing with main thread at top of while\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);
GST_DEBUG(GST_CAT_THREAD,"sync: removed spinning state due to failed iteration\n");
}
}
GST_DEBUG (GST_CAT_THREAD, "sync: waiting at bottom of while for signal from main process\n");
g_mutex_lock (thread->lock);
GST_DEBUG (GST_CAT_THREAD, "sync: signaling that the thread is out of the SPINNING loop\n");
g_cond_signal (thread->cond);
g_cond_wait (thread->cond, thread->lock);
GST_DEBUG (GST_CAT_THREAD, "sync: main process has signaled at bottom of while\n");
// now change the children's and thread's state
gst_thread_update_state (thread);
GST_DEBUG (GST_CAT_THREAD, "sync: done changing state, signaling back\n");
g_cond_signal (thread->cond);
// don't release the mutex, we hold that into the top of the loop
GST_DEBUG (GST_CAT_THREAD, "sync: done syncning with main thread 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);
GST_DEBUG (GST_CAT_THREAD, "sync-main: thread locked\n");
// g_mutex_lock(thread->lock);
if (!spinning) {
GST_DEBUG (GST_CAT_THREAD, "sync-main: waiting for spindown\n");
g_cond_wait (thread->cond, thread->lock);
}
GST_DEBUG (GST_CAT_THREAD, "sync-main: signaling\n");
g_cond_signal (thread->cond);
GST_DEBUG (GST_CAT_THREAD, "sync-main: waiting for ack\n");
g_cond_wait (thread->cond,thread->lock);
GST_DEBUG (GST_CAT_THREAD, "sync-main: unlocking\n");
g_mutex_unlock(thread->lock);
GST_DEBUG (GST_CAT_THREAD, "sync-main: unlocked\n");
}
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);
}
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;
}
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