mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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ffe760e476
Original commit message from CVS: GST_DEBUG and _INFO should have no trailing \n
602 lines
19 KiB
C
602 lines
19 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstthread.c: Threaded container object
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <unistd.h>
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/* #define GST_DEBUG_ENABLED */
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#include "gst_private.h"
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#include "gstthread.h"
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#include "gstscheduler.h"
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#include "gstqueue.h"
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GstElementDetails gst_thread_details = {
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"Threaded container",
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"Bin",
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"Container that creates/manages a thread",
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VERSION,
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"Erik Walthinsen <omega@cse.ogi.edu>",
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"(C) 1999, 2000",
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};
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/* Thread signals and args */
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enum {
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/* FILL ME */
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LAST_SIGNAL
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};
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enum {
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SPINUP=0,
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STATECHANGE,
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STARTUP
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};
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enum {
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ARG_0,
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};
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static void gst_thread_class_init (GstThreadClass *klass);
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static void gst_thread_init (GstThread *thread);
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static void gst_thread_dispose (GObject *object);
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static void gst_thread_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
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static void gst_thread_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
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static GstElementStateReturn gst_thread_change_state (GstElement *element);
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#ifndef GST_DISABLE_LOADSAVE
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static xmlNodePtr gst_thread_save_thyself (GstObject *object, xmlNodePtr parent);
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static void gst_thread_restore_thyself (GstObject *object, xmlNodePtr self);
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#endif
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static void* gst_thread_main_loop (void *arg);
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static GstBinClass *parent_class = NULL;
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/* static guint gst_thread_signals[LAST_SIGNAL] = { 0 }; */
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GType
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gst_thread_get_type(void) {
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static GType thread_type = 0;
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if (!thread_type) {
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static const GTypeInfo thread_info = {
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sizeof(GstThreadClass),
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NULL,
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NULL,
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(GClassInitFunc)gst_thread_class_init,
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NULL,
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NULL,
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sizeof(GstThread),
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4,
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(GInstanceInitFunc)gst_thread_init,
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NULL
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};
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thread_type = g_type_register_static(GST_TYPE_BIN, "GstThread", &thread_info, 0);
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}
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return thread_type;
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}
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static void
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gst_thread_class_init (GstThreadClass *klass)
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{
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GObjectClass *gobject_class;
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GstObjectClass *gstobject_class;
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GstElementClass *gstelement_class;
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GstBinClass *gstbin_class;
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gobject_class = (GObjectClass*)klass;
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gstobject_class = (GstObjectClass*)klass;
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gstelement_class = (GstElementClass*)klass;
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gstbin_class = (GstBinClass*)klass;
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parent_class = g_type_class_ref (GST_TYPE_BIN);
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gobject_class->dispose = gst_thread_dispose;
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#ifndef GST_DISABLE_LOADSAVE
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gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_thread_save_thyself);
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gstobject_class->restore_thyself = GST_DEBUG_FUNCPTR(gst_thread_restore_thyself);
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#endif
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gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_thread_change_state);
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/* gstbin_class->schedule = gst_thread_schedule_dummy; */
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gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_thread_set_property);
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gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_thread_get_property);
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}
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static void
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gst_thread_init (GstThread *thread)
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{
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const gchar *schedname;
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GstScheduler *scheduler;
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GST_DEBUG (GST_CAT_THREAD, "initializing thread");
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/* we're a manager by default */
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GST_FLAG_SET (thread, GST_BIN_FLAG_MANAGER);
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GST_FLAG_SET (thread, GST_BIN_SELF_SCHEDULABLE);
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schedname = gst_schedulerfactory_get_default_name ();
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scheduler = gst_schedulerfactory_make (schedname, GST_ELEMENT (thread));
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GST_ELEMENT_SCHED (thread) = scheduler;
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gst_object_ref (GST_OBJECT (scheduler));
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gst_object_sink (GST_OBJECT (scheduler));
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thread->lock = g_mutex_new ();
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thread->cond = g_cond_new ();
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thread->ppid = getpid ();
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thread->thread_id = -1;
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}
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static void
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gst_thread_dispose (GObject *object)
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{
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GstThread *thread = GST_THREAD (object);
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GST_DEBUG (GST_CAT_REFCOUNTING, "dispose");
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g_mutex_free (thread->lock);
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g_cond_free (thread->cond);
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G_OBJECT_CLASS (parent_class)->dispose (object);
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if (GST_ELEMENT_SCHED (thread)) {
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gst_object_unref (GST_OBJECT (GST_ELEMENT_SCHED (thread)));
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}
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}
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static void
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gst_thread_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
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{
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail (GST_IS_THREAD (object));
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switch (prop_id) {
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_thread_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
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{
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail (GST_IS_THREAD (object));
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switch (prop_id) {
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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/**
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* gst_thread_new:
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* @name: the name of the thread
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*
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* Create a new thread with the given name.
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*
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* Returns: The new thread
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*/
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GstElement*
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gst_thread_new (const gchar *name)
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{
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return gst_elementfactory_make ("thread", name);
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}
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#define THR_INFO(format,args...) \
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GST_INFO_ELEMENT(GST_CAT_THREAD, thread, "sync(" GST_DEBUG_THREAD_FORMAT "): " format , \
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GST_DEBUG_THREAD_ARGS(thread->pid) , ## args )
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#define THR_DEBUG(format,args...) \
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GST_DEBUG_ELEMENT(GST_CAT_THREAD, thread, "sync(" GST_DEBUG_THREAD_FORMAT "): " format , \
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GST_DEBUG_THREAD_ARGS(thread->pid) , ## args )
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#define THR_INFO_MAIN(format,args...) \
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GST_INFO_ELEMENT(GST_CAT_THREAD, thread, "sync-main(" GST_DEBUG_THREAD_FORMAT "): " format , \
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GST_DEBUG_THREAD_ARGS(thread->ppid) , ## args )
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#define THR_DEBUG_MAIN(format,args...) \
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GST_DEBUG_ELEMENT(GST_CAT_THREAD, thread, "sync-main(" GST_DEBUG_THREAD_FORMAT "): " format , \
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GST_DEBUG_THREAD_ARGS(thread->ppid) , ## args )
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static GstElementStateReturn
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gst_thread_update_state (GstThread *thread)
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{
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/* check for state change */
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if (GST_STATE_PENDING(thread) != GST_STATE_VOID_PENDING) {
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/* punt and change state on all the children */
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if (GST_ELEMENT_CLASS (parent_class)->change_state)
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return GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT(thread));
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}
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return GST_STATE_SUCCESS;
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}
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static GstElementStateReturn
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gst_thread_change_state (GstElement * element)
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{
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GstThread *thread;
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gboolean stateset = GST_STATE_SUCCESS;
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gint transition;
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pthread_t self = pthread_self ();
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g_return_val_if_fail (GST_IS_THREAD (element), FALSE);
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thread = GST_THREAD (element);
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transition = GST_STATE_TRANSITION (element);
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THR_INFO ("changing state from %s to %s",
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gst_element_statename (GST_STATE (element)),
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gst_element_statename (GST_STATE_PENDING (element)));
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if (pthread_equal (self, thread->thread_id)) {
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GST_DEBUG (GST_CAT_THREAD,
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"no sync(" GST_DEBUG_THREAD_FORMAT "): setting own thread's state to spinning",
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GST_DEBUG_THREAD_ARGS (thread->pid));
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return gst_thread_update_state (thread);
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}
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switch (transition) {
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case GST_STATE_NULL_TO_READY:
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/* set the state to idle */
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GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
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THR_DEBUG ("creating thread \"%s\"", GST_ELEMENT_NAME (element));
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g_mutex_lock (thread->lock);
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/* create the thread */
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pthread_create (&thread->thread_id, NULL, gst_thread_main_loop, thread);
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/* wait for it to 'spin up' */
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THR_DEBUG ("waiting for child thread spinup");
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g_cond_wait (thread->cond, thread->lock);
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THR_DEBUG ("thread claims to be up");
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g_mutex_unlock (thread->lock);
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break;
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case GST_STATE_READY_TO_PAUSED:
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THR_INFO ("readying thread");
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g_mutex_lock (thread->lock);
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THR_DEBUG ("signaling");
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g_cond_signal (thread->cond);
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THR_DEBUG ("waiting for ack");
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g_cond_wait (thread->cond, thread->lock);
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THR_DEBUG ("got ack");
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g_mutex_unlock (thread->lock);
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break;
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case GST_STATE_PAUSED_TO_PLAYING:
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THR_DEBUG ("telling thread to start spinning");
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g_mutex_lock (thread->lock);
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THR_DEBUG ("signaling");
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g_cond_signal (thread->cond);
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THR_DEBUG ("waiting for ack");
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g_cond_wait (thread->cond, thread->lock);
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THR_DEBUG ("got ack");
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g_mutex_unlock (thread->lock);
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break;
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case GST_STATE_PLAYING_TO_PAUSED:
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{
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GList *elements = gst_bin_get_list (GST_BIN (thread));
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THR_INFO ("pausing thread");
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/* the following code ensures that the bottom half of thread will run
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* to perform each elements' change_state() (by calling gstbin.c::
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* change_state()).
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* + the pending state was already set by gstelement.c::set_state()
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* + find every queue we manage, and signal its empty and full conditions
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*/
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g_mutex_lock (thread->lock);
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GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
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while (elements) {
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GstElement *element = GST_ELEMENT (elements->data);
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g_assert (element);
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THR_DEBUG (" element \"%s\"", GST_ELEMENT_NAME (element));
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elements = g_list_next (elements);
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if (GST_IS_QUEUE (element)) {
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GstQueue *queue = GST_QUEUE (element);
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/* FIXME make this more efficient by only waking queues that are asleep
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* FIXME and only waking the appropriate condition (depending on if it's
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* FIXME on up- or down-stream side)
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* FIXME also make this more efficient by keeping list of managed queues
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*/
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THR_DEBUG ("waking queue \"%s\"", GST_ELEMENT_NAME (element));
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g_mutex_lock (queue->qlock);
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GST_STATE_PENDING (element) = GST_STATE_PAUSED;
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g_cond_signal (queue->not_full);
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g_cond_signal (queue->not_empty);
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g_mutex_unlock (queue->qlock);
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}
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else {
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GList *pads = GST_ELEMENT_PADS (element);
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while (pads) {
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GstRealPad *peer = GST_REAL_PAD (GST_PAD_PEER (pads->data));
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GstElement *peerelement;
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pads = g_list_next (pads);
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if (!peer)
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continue;
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peerelement = GST_PAD_PARENT (peer);
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if (!peerelement)
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continue; /* deal with case where there's no peer */
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if (!GST_FLAG_IS_SET (peerelement, GST_ELEMENT_DECOUPLED)) {
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GST_DEBUG (GST_CAT_THREAD, "peer element isn't DECOUPLED");
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continue;
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}
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/* FIXME this needs to go away eventually */
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if (!GST_IS_QUEUE (peerelement)) {
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GST_DEBUG (GST_CAT_THREAD, "peer element isn't a Queue");
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continue;
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}
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if (GST_ELEMENT_SCHED (peerelement) != GST_ELEMENT_SCHED (thread)) {
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GstQueue *queue = GST_QUEUE (peerelement);
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THR_DEBUG (" element \"%s\" has pad cross sched boundary", GST_ELEMENT_NAME (element));
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/* FIXME!! */
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g_mutex_lock (queue->qlock);
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g_cond_signal (queue->not_full);
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g_cond_signal (queue->not_empty);
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g_mutex_unlock (queue->qlock);
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}
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}
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}
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}
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THR_DEBUG ("telling thread to pause, signaling");
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g_cond_signal (thread->cond);
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THR_DEBUG ("waiting for ack");
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g_cond_wait (thread->cond, thread->lock);
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THR_DEBUG ("got ack");
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g_mutex_unlock (thread->lock);
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break;
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}
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case GST_STATE_READY_TO_NULL:
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THR_DEBUG ("telling thread to pause (null) - and joining");
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/* MattH FIXME revisit */
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g_mutex_lock (thread->lock);
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THR_DEBUG ("signaling");
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g_cond_signal (thread->cond);
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THR_DEBUG ("waiting for ack");
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g_cond_wait (thread->cond, thread->lock);
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THR_DEBUG ("got ack");
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pthread_join (thread->thread_id, NULL);
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thread->thread_id = -1;
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g_mutex_unlock (thread->lock);
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GST_FLAG_UNSET (thread, GST_THREAD_STATE_REAPING);
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GST_FLAG_UNSET (thread, GST_THREAD_STATE_STARTED);
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GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
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break;
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case GST_STATE_PAUSED_TO_READY:
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THR_DEBUG ("telling thread to stop spinning");
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g_mutex_lock (thread->lock);
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THR_DEBUG ("signaling");
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g_cond_signal (thread->cond);
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THR_DEBUG ("waiting for ack");
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g_cond_wait (thread->cond, thread->lock);
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THR_DEBUG ("got ack");
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g_mutex_unlock (thread->lock);
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break;
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default:
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GST_DEBUG_ELEMENT (GST_CAT_THREAD, element, "UNHANDLED STATE CHANGE! %x", transition);
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break;
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}
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return stateset;
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}
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/**
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* gst_thread_main_loop:
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* @arg: the thread to start
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*
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* The main loop of the thread. The thread will iterate
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* while the state is GST_THREAD_STATE_SPINNING
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*/
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static void *
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gst_thread_main_loop (void *arg)
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{
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GstThread *thread = GST_THREAD (arg);
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gint stateset;
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g_mutex_lock (thread->lock);
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gst_scheduler_setup (GST_ELEMENT_SCHED (thread));
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GST_FLAG_UNSET (thread, GST_THREAD_STATE_REAPING);
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thread->pid = getpid();
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THR_INFO_MAIN("thread is running");
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/* first we need to change the state of all the children */
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if (GST_ELEMENT_CLASS (parent_class)->change_state) {
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stateset = GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT(thread));
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if (stateset != GST_STATE_SUCCESS) {
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THR_DEBUG_MAIN ("state change of children failed");
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}
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}
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THR_DEBUG_MAIN ("indicating spinup");
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g_cond_signal (thread->cond);
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/* don't unlock the mutex because we hold it into the top of the while loop */
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THR_DEBUG_MAIN ("thread has indicated spinup to parent process");
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/***** THREAD IS NOW IN READY STATE *****/
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while (!GST_FLAG_IS_SET (thread, GST_THREAD_STATE_REAPING)) {
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/* NOTE we hold the thread lock at this point */
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/* what we do depends on what state we're in */
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switch (GST_STATE (thread)) {
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/* NOTE: cannot be in NULL, we're not running in that state at all */
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case GST_STATE_READY:
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/* wait to be set to either the NULL or PAUSED states */
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THR_DEBUG_MAIN ("thread in %s state, waiting for either %s or %s",
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gst_element_statename (GST_STATE_READY),
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gst_element_statename (GST_STATE_NULL),
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gst_element_statename (GST_STATE_PAUSED));
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g_cond_wait (thread->cond,thread->lock);
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/* this must have happened by a state change in the thread context */
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if (GST_STATE_PENDING (thread) != GST_STATE_NULL &&
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GST_STATE_PENDING (thread) != GST_STATE_PAUSED) {
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g_cond_signal (thread->cond);
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continue;
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}
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/* been signaled, we need to state transition now and signal back */
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gst_thread_update_state (thread);
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THR_DEBUG_MAIN ("done with state transition, signaling back to parent process");
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g_cond_signal (thread->cond);
|
|
/* now we decide what to do next */
|
|
if (GST_STATE (thread) == GST_STATE_NULL) {
|
|
/* REAPING must be set, we can simply break this iteration */
|
|
GST_FLAG_SET (thread, GST_THREAD_STATE_REAPING);
|
|
}
|
|
continue;
|
|
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",
|
|
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);
|
|
|
|
/* this must have happened by a state change in the thread context */
|
|
if (GST_STATE_PENDING (thread) != GST_STATE_READY &&
|
|
GST_STATE_PENDING (thread) != GST_STATE_PLAYING) {
|
|
g_cond_signal (thread->cond);
|
|
continue;
|
|
}
|
|
|
|
/* been signaled, we need to state transition now and signal back */
|
|
gst_thread_update_state (thread);
|
|
/* now we decide what to do next */
|
|
if (GST_STATE (thread) != GST_STATE_PLAYING) {
|
|
/* either READY or the state change failed for some reason */
|
|
g_cond_signal (thread->cond);
|
|
continue;
|
|
}
|
|
else {
|
|
GST_FLAG_SET (thread, GST_THREAD_STATE_SPINNING);
|
|
/* PLAYING is coming up, so we can now start spinning */
|
|
while (GST_FLAG_IS_SET (thread, GST_THREAD_STATE_SPINNING)) {
|
|
gboolean status;
|
|
|
|
g_cond_signal (thread->cond);
|
|
g_mutex_unlock (thread->lock);
|
|
status = gst_bin_iterate (GST_BIN (thread));
|
|
g_mutex_lock (thread->lock);
|
|
/* g_cond_signal(thread->cond); */
|
|
|
|
if (!status || GST_STATE_PENDING (thread) != GST_STATE_VOID_PENDING)
|
|
GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
|
|
}
|
|
/* looks like we were stopped because of a statechange */
|
|
if (GST_STATE_PENDING (thread)) {
|
|
gst_thread_update_state (thread);
|
|
}
|
|
/* once we're here, SPINNING has stopped, we should signal that we're done */
|
|
THR_DEBUG_MAIN ("SPINNING stopped, signaling back to parent process");
|
|
g_cond_signal (thread->cond);
|
|
/* now we can wait for PAUSED */
|
|
continue;
|
|
}
|
|
case GST_STATE_PLAYING:
|
|
/* wait to be set to PAUSED */
|
|
THR_DEBUG_MAIN ("thread in %s state, waiting for %s",
|
|
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);
|
|
/* now we decide what to do next */
|
|
/* there's only PAUSED, we we just wait for it */
|
|
continue;
|
|
case GST_STATE_NULL:
|
|
THR_DEBUG_MAIN ("thread in %s state, preparing to die",
|
|
gst_element_statename(GST_STATE_NULL));
|
|
GST_FLAG_SET (thread, GST_THREAD_STATE_REAPING);
|
|
break;
|
|
default:
|
|
g_assert_not_reached ();
|
|
break;
|
|
}
|
|
}
|
|
/* we need to destroy the scheduler here bacause it has mapped it's
|
|
* stack into the threads stack space */
|
|
gst_scheduler_reset (GST_ELEMENT_SCHED (thread));
|
|
|
|
/* 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;
|
|
}
|
|
|
|
#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");
|
|
|
|
if (GST_OBJECT_CLASS (parent_class)->restore_thyself)
|
|
GST_OBJECT_CLASS (parent_class)->restore_thyself (object, self);
|
|
}
|
|
#endif /* GST_DISABLE_LOADSAVE */
|