On Sat, 2012-05-12 at 13:52 -0400, Kurt Miller wrote: > >>> Here is the stack trace showing the recursive call to > >>> gst_plugin_load_by_name(): > >>> > >>> #2 0x0009c065 in _rthread_mutex_lock (mutexp=0x7c1e6670, trywait=0, > >>> abstime=0x0) at /usr/src/lib/librthread/rthread_sync.c:127 > >>> #3 0x08c68ec2 in g_mutex_lock () from > >>> /usr/local/lib/libglib-2.0.so.3200.0 > >>> #4 0x02f1f3e5 in gst_plugin_load_file (filename=0x7c1f6580 > >>> "/usr/local/lib/gstreamer-0.10/libgstadder.so", error=0xcfbc0bc8) > >>> at > >>> /usr/obj/ports/gstreamer-0.10.36/gstreamer-0.10.36/gst/gstplugin.c:722 > >>> #5 0x02f2022b in gst_plugin_load_by_name (name=0x7c3c2bf5 "adder") at > >>> /usr/obj/ports/gstreamer-0.10.36/gstreamer-0.10.36/gst/gstplugin.c:1297 > >>> #6 0x02f2185d in gst_plugin_feature_load (feature=0x7c3c32e8) at > >>> /usr/obj/ports/gstreamer-0.10.36/gstreamer-0.10.36/gst/gstpluginfeature.c:111 > >>> #7 0x0b5e3954 in gst_adder_get_type () at > >>> /usr/obj/ports/gstreamermm-0.10.10.1/gstreamermm-0.10.10.1/gstreamer/gstreamermm/adder.cc:29 > >>> #8 0x0ff679e1 in plugin_init (plugin=0x7c397d48) at > >>> /usr/obj/ports/gst-plugins-base-0.10.36/gst-plugins-base-0.10.36/gst/adder/gstadder.c:1322 > >>> #9 0x02f1e6ff in gst_plugin_register_func (plugin=0x7c397d48, > >>> desc=0x2ff66020, user_data=0x0) > >>> at > >>> /usr/obj/ports/gstreamer-0.10.36/gstreamer-0.10.36/gst/gstplugin.c:557 > >>> #10 0x02f1f611 in gst_plugin_load_file (filename=0x7c1f6580 > >>> "/usr/local/lib/gstreamer-0.10/libgstadder.so", error=0xcfbc0dc8) > >>> at > >>> /usr/obj/ports/gstreamer-0.10.36/gstreamer-0.10.36/gst/gstplugin.c:843 > >>> #11 0x02f2022b in gst_plugin_load_by_name (name=0x7c3c2bf5 "adder") at > >>> /usr/obj/ports/gstreamer-0.10.36/gstreamer-0.10.36/gst/gstplugin.c:1297 > >>> #12 0x02f2185d in gst_plugin_feature_load (feature=0x7c3c32e8) at > >>> /usr/obj/ports/gstreamer-0.10.36/gstreamer-0.10.36/gst/gstpluginfeature.c:111 > >>> #13 0x0b5e3954 in gst_adder_get_type () at > >>> /usr/obj/ports/gstreamermm-0.10.10.1/gstreamermm-0.10.10.1/gstreamer/gstreamermm/adder.cc:29 > >>> #14 0x0b624d21 in Gst::wrap_init () at > >>> /usr/obj/ports/gstreamermm-0.10.10.1/gstreamermm-0.10.10.1/gstreamer/gstreamermm/wrap_init.cc:386 > >>> #15 0x0b6258d0 in initialize_wrap_system () at > >>> /usr/obj/ports/gstreamermm-0.10.10.1/gstreamermm-0.10.10.1/gstreamer/gstreamermm/init.cc:36 > >>> #16 0x0b625a77 in Gst::init (argc=@0xcfbc0fb4, argv=@0xcfbc0fb8) > >>> at > >>> /usr/obj/ports/gstreamermm-0.10.10.1/gstreamermm-0.10.10.1/gstreamer/gstreamermm/init.cc:53 > >>> #17 0x1c01d13c in Glib::PropertyProxy<Glib::ustring>::get_value () > > I'm curious why frame 8 above doesn't end up going > recursive on Linux like it does for OpenBSD. When I step through > The code on OpenBSD it seems unavoidable.
It's difficult to know exactly what's happening. On this system, stepping through the code from frame 8 goes to line 119 of gstadder.c which looks like the following: GST_BOILERPLATE (GstAdder, gst_adder, GstElement, GST_TYPE_ELEMENT); Apparently, this macro (defined in gstutils.h of GStreamer) generates standard functions (among other things) for plug-ins such as the *_get_type() functions (gst_adder_get_type() in this case). The stack trace below confirms this: #0 g_once_init_enter(location = 0x7ffff31494e8) at gthread.c:674 #1 gst_adder_get_type() at gstadder.c:119 #2 plugin_init(plugin = 0x725e70) at gstadder.c:1322 #3 gst_plugin_register_func(plugin = 0x725e70, desc = 0x7ffff3149460, user_data = 0x0) at gstplugin.c:557 #4 gst_plugin_load_file(filename = 0x734230 "/opt/usr-jhbuild/lib/gstreamer-0.10/libgstadder.so", error = 0x7fffffffdd88) at gstplugin.c:843 #5 gst_plugin_load_by_name(name = 0x73333f "adder") at gstplugin.c:1297 #6 gst_plugin_feature_load(feature = 0x735480) at gstpluginfeature.c:111 #7 gst_adder_get_type() at adder.cc:29 #8 Gst::wrap_init() at wrap_init.cc:384 #9 Gst::initialize_wrap_system() at init.cc:36 #10 Gst::init(argc = @0x7fffffffde9c: 2, argv = @0x7fffffffde90: 0x7fffffffe028) at init.cc:53 #11 main(argc = 2, argv = 0x7fffffffe028) at hello_world/main.cc:67 On this system, the function that is called is gst_adder_get_type() in gstadder.c (of the gst-plugins-base module) and not the one in adder.cc (of gstreamermm). > > Thanks, > -Kurt > -- José _______________________________________________ gtkmm-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/gtkmm-list
