Added the event code to create/register/destroy events from a memchunk.

Original commit message from CVS:
Added the event code to create/register/destroy events from a memchunk.

gst/Makefile.am

@@ -69,6 +69,7 @@ libgst_la_SOURCES =		\
 	gstdparammanager.c	\
 	gstelement.c		\
 	gstelementfactory.c	\
+	gstevent.c		\
 	gstextratypes.c		\
 	gstinfo.c		\
 	gstpad.c		\

gst/gstevent.c

@@ -0,0 +1,81 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2000 Wim Taymans <wim.taymans@chello.be>
+ *
+ * gstevent.h: Header for GstEvent subsystem
+ *
+ * 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 "gst/gstinfo.h"
+#include "gst/gstevent.h"
+
+GType _gst_event_type;
+
+static GMemChunk *_gst_event_chunk;
+static GMutex *_gst_event_chunk_lock;
+
+void
+_gst_event_initialize (void)
+{
+  gint eventsize = sizeof(GstEvent);
+  static const GTypeInfo event_info = {
+    0, //sizeof(GstElementClass),
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    0, //sizeof(GstElement),
+    0,
+    NULL,
+  };
+
+  // round up to the nearest 32 bytes for cache-line and other efficiencies
+  eventsize = (((eventsize-1) / 32) + 1) * 32;
+
+  _gst_event_chunk = g_mem_chunk_new ("GstEvent", eventsize,
+  				      eventsize * 32, G_ALLOC_AND_FREE);
+
+  _gst_event_chunk_lock = g_mutex_new ();
+
+  // register the type
+  _gst_event_type = g_type_register_static (G_TYPE_INT, "GstEvent", &event_info, 0);
+}
+
+GstEvent*
+gst_event_empty_new (GstEventType type)
+{
+  GstEvent *event;
+
+  g_mutex_lock (_gst_event_chunk_lock);
+  event = g_mem_chunk_alloc (_gst_event_chunk);
+  g_mutex_unlock (_gst_event_chunk_lock);
+  GST_INFO (GST_CAT_EVENT, "creating new event %p", event);
+
+  GST_DATA_TYPE (event) = _gst_event_type;
+
+  return event;
+}
+
+void
+gst_event_free (GstEvent* event)
+{
+  g_mutex_lock (_gst_event_chunk_lock);
+  g_mem_chunk_free (_gst_event_chunk, event);
+  g_mutex_unlock (_gst_event_chunk_lock);
+}

gst/gstevent.h

@@ -39,8 +39,10 @@ typedef enum {
   GST_EVENT_SEEK,
 } GstEventType;
 
+extern GType _gst_event_type;
+
 #define GST_EVENT(event)	((GstEvent*)(event))
-#define GST_IS_EVENT(event)	(GST_DATA_TYPE(event) == gst_event_get_type())
+#define GST_IS_EVENT(event)	(GST_DATA_TYPE(event) == _gst_event_type)
 
 #define GST_EVENT_TYPE(event)	(GST_EVENT(event)->type)
 
@@ -52,8 +54,8 @@ struct _GstEvent {
   GstEventType type;
 };
 
-GType		gst_event_get_type	(void);
+void 		_gst_event_initialize 	(void);
-
+	
 GstEvent*	gst_event_empty_new	(GstEventType type);
 void		gst_event_free 		(GstEvent* event);