2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 #include <gst/gstthread.h>
25 GstElementDetails gst_thread_details = {
28 "Container that creates/manages a thread",
30 "Erik Walthinsen <omega@cse.ogi.edu>",
35 /* Thread signals and args */
47 static void gst_thread_class_init(GstThreadClass *klass);
48 static void gst_thread_init(GstThread *thread);
50 static void gst_thread_set_arg(GtkObject *object,GtkArg *arg,guint id);
51 static void gst_thread_get_arg(GtkObject *object,GtkArg *arg,guint id);
52 static GstElementStateReturn gst_thread_change_state(GstElement *element);
54 static xmlNodePtr gst_thread_save_thyself(GstElement *element,xmlNodePtr parent);
56 static void gst_thread_prepare(GstThread *thread);
57 static void gst_thread_signal_thread(GstThread *thread);
60 static GstBin *parent_class = NULL;
61 //static guint gst_thread_signals[LAST_SIGNAL] = { 0 };
64 gst_thread_get_type(void) {
65 static GtkType thread_type = 0;
68 static const GtkTypeInfo thread_info = {
71 sizeof(GstThreadClass),
72 (GtkClassInitFunc)gst_thread_class_init,
73 (GtkObjectInitFunc)gst_thread_init,
76 (GtkClassInitFunc)NULL,
78 thread_type = gtk_type_unique(gst_bin_get_type(),&thread_info);
84 gst_thread_class_init(GstThreadClass *klass) {
85 GtkObjectClass *gtkobject_class;
86 GstObjectClass *gstobject_class;
87 GstElementClass *gstelement_class;
89 gtkobject_class = (GtkObjectClass*)klass;
90 gstobject_class = (GstObjectClass*)klass;
91 gstelement_class = (GstElementClass*)klass;
93 parent_class = gtk_type_class(gst_bin_get_type());
95 gtk_object_add_arg_type("GstThread::create_thread", GTK_TYPE_BOOL,
96 GTK_ARG_READWRITE, ARG_CREATE_THREAD);
98 gstelement_class->change_state = gst_thread_change_state;
99 gstelement_class->save_thyself = gst_thread_save_thyself;
101 gtkobject_class->set_arg = gst_thread_set_arg;
102 gtkobject_class->get_arg = gst_thread_get_arg;
105 static void gst_thread_init(GstThread *thread) {
106 GST_FLAG_SET(thread,GST_THREAD_CREATE);
108 // thread->entries = NULL;
109 // thread->numentries = 0;
111 thread->lock = g_mutex_new();
112 thread->cond = g_cond_new();
115 static void gst_thread_set_arg(GtkObject *object,GtkArg *arg,guint id) {
116 /* it's not null if we got it, but it might not be ours */
117 g_return_if_fail(GST_IS_THREAD(object));
120 case ARG_CREATE_THREAD:
121 if (GTK_VALUE_BOOL(*arg)) {
122 gst_info("gstthread: turning ON the creation of the thread\n");
123 GST_FLAG_SET(object,GST_THREAD_CREATE);
124 gst_info("gstthread: flags are 0x%08x\n",GST_FLAGS(object));
126 gst_info("gstthread: turning OFF the creation of the thread\n");
127 GST_FLAG_UNSET(object,GST_THREAD_CREATE);
128 gst_info("gstthread: flags are 0x%08x\n",GST_FLAGS(object));
136 static void gst_thread_get_arg(GtkObject *object,GtkArg *arg,guint id) {
137 /* it's not null if we got it, but it might not be ours */
138 g_return_if_fail(GST_IS_THREAD(object));
141 case ARG_CREATE_THREAD:
142 GTK_VALUE_BOOL(*arg) = GST_FLAG_IS_SET(object,GST_THREAD_CREATE);
152 * @name: the name of the thread
154 * Create a new thrad with the given name
156 * Returns; The new thread
158 GstElement *gst_thread_new(guchar *name) {
161 thread = gtk_type_new(gst_thread_get_type());
162 gst_element_set_name(GST_ELEMENT(thread),name);
163 return GST_ELEMENT(thread);
168 static GstElementStateReturn gst_thread_change_state(GstElement *element) {
170 gboolean stateset = TRUE;
173 g_return_val_if_fail(GST_IS_THREAD(element), FALSE);
174 thread = GST_THREAD(element);
176 gst_info("gstthread: thread \"%s\" change state %d\n",
177 gst_element_get_name(GST_ELEMENT(element)), GST_STATE_PENDING(element));
179 pending = GST_STATE_PENDING(element);
181 if (GST_ELEMENT_CLASS(parent_class)->change_state)
182 stateset = GST_ELEMENT_CLASS(parent_class)->change_state(element);
184 gst_info("gstthread: stateset %d %d\n", stateset, GST_STATE_PENDING(element));
187 case GST_STATE_READY:
188 if (!stateset) return FALSE;
189 // we want to prepare our internal state for doing the iterations
190 gst_info("gstthread: preparing thread \"%s\" for iterations:\n",
191 gst_element_get_name(GST_ELEMENT(element)));
192 //gst_thread_prepare(thread);
194 gst_bin_create_plan(GST_BIN(thread));
195 // if (thread->numentries == 0)
197 // set the state to idle
198 GST_FLAG_UNSET(thread,GST_THREAD_STATE_SPINNING);
199 // create the thread if that's what we're supposed to do
200 gst_info("gstthread: flags are 0x%08x\n",GST_FLAGS(thread));
201 if (GST_FLAG_IS_SET(thread,GST_THREAD_CREATE)) {
202 gst_info("gstthread: starting thread \"%s\"\n",
203 gst_element_get_name(GST_ELEMENT(element)));
204 pthread_create(&thread->thread_id,NULL,
205 gst_thread_main_loop,thread);
207 gst_info("gstthread: NOT starting thread \"%s\"\n",
208 gst_element_get_name(GST_ELEMENT(element)));
210 return GST_STATE_SUCCESS;
212 case GST_STATE_PLAYING:
213 if (!stateset) return FALSE;
214 gst_info("gstthread: starting thread \"%s\"\n",
215 gst_element_get_name(GST_ELEMENT(element)));
216 GST_FLAG_SET(thread,GST_THREAD_STATE_SPINNING);
217 gst_thread_signal_thread(thread);
219 case GST_STATE_PAUSED:
220 gst_info("gstthread: pausing thread \"%s\"\n",
221 gst_element_get_name(GST_ELEMENT(element)));
222 GST_FLAG_UNSET(thread,GST_THREAD_STATE_SPINNING);
223 gst_thread_signal_thread(thread);
226 gst_info("gstthread: stopping thread \"%s\"\n",
227 gst_element_get_name(GST_ELEMENT(element)));
228 GST_FLAG_SET(thread,GST_THREAD_STATE_REAPING);
229 gst_thread_signal_thread(thread);
239 * gst_thread_main_loop:
240 * @arg: the thread to start
242 * The main loop of the thread. The thread will iterate
243 * while the state is GST_THREAD_STATE_SPINNING
245 void *gst_thread_main_loop(void *arg) {
246 GstThread *thread = GST_THREAD(arg);
248 gst_info("gstthread: thread \"%s\" is running with PID %d\n",
249 gst_element_get_name(GST_ELEMENT(thread)), getpid());
251 while(!GST_FLAG_IS_SET(thread,GST_THREAD_STATE_REAPING)) {
252 if (GST_FLAG_IS_SET(thread,GST_THREAD_STATE_SPINNING))
253 gst_bin_iterate(GST_BIN(thread));
255 g_mutex_lock(thread->lock);
256 g_cond_wait(thread->cond,thread->lock);
257 g_mutex_unlock(thread->lock);
261 GST_FLAG_UNSET(thread,GST_THREAD_STATE_REAPING);
262 pthread_join(thread->thread_id,0);
264 gst_info("gstthread: thread \"%s\" is stopped\n",
265 gst_element_get_name(GST_ELEMENT(thread)));
269 static void gst_thread_signal_thread(GstThread *thread) {
270 g_mutex_lock(thread->lock);
271 g_cond_signal(thread->cond);
272 g_mutex_unlock(thread->lock);
275 static xmlNodePtr gst_thread_save_thyself(GstElement *element,xmlNodePtr parent) {
276 xmlNewChild(parent,NULL,"type","thread");
278 if (GST_ELEMENT_CLASS(parent_class)->save_thyself)
279 GST_ELEMENT_CLASS(parent_class)->save_thyself(element,parent);