Gstreamer & GLib memory management/profiling

[Sergei Vorobyov]

I "forgot" the line

extern GMemVTable *glib_mem_profiler_table;

before int main ....

(by a nasty habit of C-x C-s, which saves in emacs but kills the line and
saves in Netbeans)

But it *does not change anything*, since it is already defined somewhere in
GLib headers.



On Fri, Oct 31, 2014 at 4:34 PM, Sergei Vorobyov <
sergei.vorobyov at facilitylabs.com> wrote:

> > I don't see why anything in GStreamer should be "incompatible" with that
> > GLib API.
>
> Neither do I. However, try a *FULL* program below:
>
> // Compile with:
> // gcc -std=c11 -Wall -pthread test.c -o test `pkg-config --cflags --libs
> glib-2.0 gstreamer-1.0 gstreamer-pbutils-1.0 gstreamer-video-1.0`
> // Run and enjoy
>
> #include <stdio.h>
> #include <stdlib.h>
>
> #include <string.h>
> #include <unistd.h>
> #include <error.h>
> #include <errno.h>
> #include <math.h>
>
> #include <glib.h>
> #include <glib/gstdio.h>
> #include <glib/gprintf.h>
>
> #include <gst/gst.h>
> #include <gst/pbutils/pbutils.h>
> #include <gst/video/videooverlay.h>
>
> int main(int argc, char** argv) {
>     GError *e;
>     g_mem_set_vtable (glib_mem_profiler_table);
>     if (g_mem_is_system_malloc ())
>         g_print ("system malloc is used\n");
>     else
>         g_print ("NOT system malloc is used\n");
>     g_print ("********************* point 1\n");
>     if (!gst_init_check (&argc, &argv, &e))
>         g_print ("failed gst_init_check: %s\n", e->message);
>     g_print ("********************* point 2\n");
>     g_mem_profile ();
>     return (EXIT_SUCCESS);
> }
>
> It produces, as expected:
>
> fl at nuc5:~/NetBeansProjects/test$ ./test
> NOT system malloc is used
> ********************* point 1
>
> (test:3987): GLib-WARNING **: free(0x1a84fd0): memory has been freed
> 12297829382473034410 times already
> *** Error in `./test': realloc(): invalid pointer: 0x0000000001a87e80 ***
> Aborted (core dumped)
>
>
> On Fri, Oct 31, 2014 at 2:20 PM, Tim Müller <tim at centricular.com> wrote:
>
>> On Fri, 2014-10-31 at 13:46 +0100, Sergei Vorobyov wrote:
>>
>> Hi,
>>
>> > GLib's memory profiling seems incompatible with GStreamer. The
>> > snippet:
>>
>> I don't see why anything in GStreamer should be "incompatible" with that
>> GLib API.
>>
>> > extern GMemVTable *glib_mem_profiler_table;
>> >
>> >
>> > gint main (gint argn, gchar** args) {
>> >     GError *e;
>> >     g_mem_set_vtable (glib_mem_profiler_table);
>> >     if (g_mem_is_system_malloc ())
>> >         g_print ("system malloc is used\n");
>> >     else
>> >         g_print ("NOT system malloc is used\n");
>> >     g_print ("********************* point 1\n");
>> >     if (!gst_init_check (&argn, &args, &e)) {
>> >         g_print ("failed gst_init_check: %s\n", e->message);
>> >     }
>> >     g_print ("********************* point 2\n");
>> >
>> >     g_mem_profile ();
>> >
>> >
>> >     ...
>> >
>> >
>> > crashes at gst_init producing:
>> >
>> >
>> > fl at nuc5:~/bin$ ./mp-v01.020
>> > NOT system malloc is used
>> > ********************* point 1
>> >
>> >
>> > (mp-v01.020:15561): GLib-WARNING **: free(0x1b32fd0): memory has been
>> > freed 12297829382473034410 times already
>> > *** Error in `./mp-v01.020': realloc(): invalid pointer:
>> > 0x0000000001b35e80 ***
>> > Aborted (core dumped)
>>
>> I would guess this is just a bug somewhere (mixing glib and non-glib
>> alloc/realloc/free API somewhere). Do you have a full stack trace from
>> gdb?
>>
>> Cheers
>>  -Tim
>>
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>
>
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