gstreamer/gst/gstthread.c

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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"
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 {
ARG_0,
ARG_CREATE_THREAD,
};
static void gst_thread_class_init (GstThreadClass *klass);
static void gst_thread_init (GstThread *thread);
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);
static void gst_thread_wait_thread (GstThread *thread);
static void gst_thread_schedule_dummy (GstBin *bin);
static void* gst_thread_main_loop (void *arg);
WARNING: Don't grab this updated unless you're really, REALLY sure. Original commit message from CVS: WARNING: Don't grab this updated unless you're really, REALLY sure. WARNING: Wait for the next one. Whole lotta changes here, including a few random bits: examples/*/Makefile: updated to use `libtool gcc`, not just `gcc` gst/ gstbuffer.h: updated to new flag style gst.c, gstdebug.h: added new debugging for function ptrs gstpipeline.c: set type of parent_class to the class, not the object gstthread.c: ditto plugins/ cdparanoia/cdparanoia.c: added an argument type, updated some defaults cobin/spindentity.c: updated to new do/while loopfunction style mp3encode/lame/gstlame.c: argument types, whole lotta lame options tests/: various changes Now, for the big changes: Once again, the scheduling system has changed. And once again, it broke a whole bunch of things. The gist of the change is that there is now a function pointer for gst_pad_push and gst_pad_pull, instead of a hard-wired function. Well, currently they are functions, but that's for debugging purposes only, they just call the function pointer after spewing lots of DEBUG(). This changed the GstPad structure a bit, and the GstPad API as well. Where elements used to provide chain() and pull() functions, they provide chain() and get() functions. gst_pad_set_pull[region]_function has been changed to get_pad_set_get[region]_function. This means all the elements out there that used to have pull functions need to be updated. The calls to that function have been changed in the normal elements, but the names of the functions passed is still _pull[region](), which is an aesthetic issue more than anything. As for what doesn't work yet, just about anything dealing with Connections is hosed, meaning threaded stuff won't work. This will be fixed about 12 hours from now, after I've slept, etc. The simplefake.c test works in both cothreaded and chained cases, but not much else will work due to the Connection problem. Needless to say, don't grab this unless you *need* these features *now*, else wait to update this stuff until tomorrow. I'm going to sleep now.
2000-12-16 10:18:09 +00:00
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);
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 (0,"initializing thread '%s'\n",GST_ELEMENT_NAME (thread));
// 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);
GST_FLAG_UNSET (thread, GST_THREAD_STATE_REAPING);
thread->lock = g_mutex_new();
thread->cond = g_cond_new();
}
static void
gst_thread_schedule_dummy (GstBin *bin)
{
g_return_if_fail (GST_IS_THREAD (bin));
if (!GST_FLAG_IS_SET (GST_THREAD (bin), GST_THREAD_STATE_SPINNING))
GST_INFO (GST_CAT_THREAD,"gstthread: scheduling delayed until thread starts");
}
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,"gstthread: turning ON the creation of the thread");
GST_FLAG_SET (object, GST_THREAD_CREATE);
GST_DEBUG (0,"gstthread: 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 (0,"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 (guchar *name)
{
return gst_elementfactory_make ("thread", name);
}
static GstElementStateReturn
gst_thread_change_state (GstElement *element)
{
GstThread *thread;
gboolean stateset = GST_STATE_SUCCESS;
gint pending, transition;
g_return_val_if_fail (GST_IS_THREAD(element), FALSE);
GST_DEBUG_ENTER("(\"%s\")",GST_ELEMENT_NAME(element));
thread = GST_THREAD (element);
GST_INFO (GST_CAT_THREAD,"gstthread: thread \"%s\" change state %d",
GST_ELEMENT_NAME (GST_ELEMENT (element)),
GST_STATE_PENDING (element));
pending = GST_STATE_PENDING (element);
transition = GST_STATE_TRANSITION (element);
// if (pending == GST_STATE (element)) return GST_STATE_SUCCESS;
GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
if (GST_ELEMENT_CLASS (parent_class)->change_state)
stateset = GST_ELEMENT_CLASS (parent_class)->change_state (element);
GST_INFO (GST_CAT_THREAD, "gstthread: stateset %d %d %d %02x", GST_STATE (element), stateset,
GST_STATE_PENDING (element), GST_STATE_TRANSITION (element));
switch (transition) {
case GST_STATE_NULL_TO_READY:
// if (!stateset) return FALSE;
// we want to prepare our internal state for doing the iterations
GST_INFO (GST_CAT_THREAD, "gstthread: 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, "gstthread: flags are 0x%08x", GST_FLAGS (thread));
if (GST_FLAG_IS_SET (thread, GST_THREAD_CREATE)) {
GST_INFO (GST_CAT_THREAD, "gstthread: starting thread \"%s\"",
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_thread_wait_thread (thread);
g_cond_wait (thread->cond, thread->lock);
g_mutex_unlock (thread->lock);
} else {
GST_INFO (GST_CAT_THREAD, "gstthread: NOT starting thread \"%s\"",
GST_ELEMENT_NAME (GST_ELEMENT (element)));
}
break;
case GST_STATE_PAUSED_TO_PLAYING:
case GST_STATE_READY_TO_PLAYING:
if (!stateset) return FALSE;
GST_INFO (GST_CAT_THREAD, "gstthread: starting thread \"%s\"",
GST_ELEMENT_NAME (GST_ELEMENT (element)));
GST_FLAG_SET (thread, GST_THREAD_STATE_SPINNING);
gst_thread_signal_thread (thread);
break;
case GST_STATE_PLAYING_TO_PAUSED:
GST_INFO (GST_CAT_THREAD,"gstthread: pausing thread \"%s\"",
GST_ELEMENT_NAME (GST_ELEMENT (element)));
//GST_FLAG_UNSET(thread,GST_THREAD_STATE_SPINNING);
gst_thread_signal_thread (thread);
break;
case GST_STATE_READY_TO_NULL:
GST_INFO (GST_CAT_THREAD,"gstthread: stopping thread \"%s\"",
GST_ELEMENT_NAME (GST_ELEMENT (element)));
GST_FLAG_SET (thread, GST_THREAD_STATE_REAPING);
gst_thread_signal_thread (thread);
pthread_join(thread->thread_id,NULL);
break;
default:
break;
}
return stateset;
}
/**
* 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);
GST_INFO (GST_CAT_THREAD,"gstthread: thread \"%s\" is running with PID %d",
GST_ELEMENT_NAME (GST_ELEMENT (thread)), getpid ());
// construct the plan and signal back
if (GST_BIN_CLASS (parent_class)->schedule)
GST_BIN_CLASS (parent_class)->schedule (GST_BIN (thread));
gst_thread_signal_thread (thread);
while (!GST_FLAG_IS_SET (thread, GST_THREAD_STATE_REAPING)) {
if (GST_FLAG_IS_SET (thread, GST_THREAD_STATE_SPINNING)) {
if (!gst_bin_iterate (GST_BIN (thread))) {
GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
}
}
else {
GST_DEBUG (0, "thread \"%s\" waiting\n", GST_ELEMENT_NAME (GST_ELEMENT (thread)));
gst_thread_wait_thread (thread);
}
}
GST_FLAG_UNSET (thread, GST_THREAD_STATE_REAPING);
// FIXME this should be removed (why's it here???)
// //pthread_join (thread->thread_id, 0);
GST_INFO (GST_CAT_THREAD, "gstthread: thread \"%s\" is stopped",
GST_ELEMENT_NAME (thread));
return NULL;
}
static void
gst_thread_signal_thread (GstThread *thread)
{
GST_DEBUG (0,"signaling thread\n");
g_mutex_lock (thread->lock);
g_cond_signal (thread->cond);
g_mutex_unlock (thread->lock);
}
static void
gst_thread_wait_thread (GstThread *thread)
{
GST_DEBUG (0,"waiting for thread\n");
g_mutex_lock (thread->lock);
g_cond_wait (thread->cond, thread->lock);
g_mutex_unlock (thread->lock);
}
static void
gst_thread_restore_thyself (GstObject *object,
xmlNodePtr self)
{
GST_DEBUG (0,"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;
}