GDB server and threaded application

[Kalpesh Jasapara]

Hello Daniel,

I believe I have the solib path set correctly and
all the symbols are being loaded when I connect
to the remote target.

BTW I am able to debug core files correctly and the
core files show all the threads. Its an issue if
I try to attach to a running multithreaded process.

gdbserver :12345 --attach <PID>, I just pick up one
of the PID's of the multithreaded process. I guess
this is supported.

Thanks for all the information.
-Kalpesh

--- Daniel Jacobowitz <drow at mvista.com> wrote:
> On Tue, Mar 25, 2003 at 09:39:01PM -0800, Vladimir
> Gurevich wrote:
> >
> > Kalpesh Jasapara wrote:
> > >I am having a problem with remote gdb debugging using gdbserver to
> > >work with multi threads. The command "info threads" shows only one
> > >thread.
> >
> > Here is a relevant excerpt from Wolfgang Denk's posting from
> > ppc-embedded:
>
> As usual, Wolfgang's answer is somewhat biased. GDB 5.3's
> multithreaded debug support is complete, and works very well once you
> have it set up. The only thing missing in the FSF tree is the little
> "[New thread 21211]" messages, which are purely cosmetic; I never came
> to an agreement about how to implement them in the current protocol.
>
> Neither the version originally in HHL 2.0 nor gdb 5.2.1 supported it
> however. Kalpesh said he was trying gdb 5.3, which does.
>
> I would also like to offer Wolfgang a BIG KICK IN THE HEAD. I have
> looked at the relevant path on his FTP site that you referenced below;
> despite his name as the only name on the "ChangeLog entry" in the
> README and the claim of "we spend some work", it is my work. I wrote
> just about every line of that patch.
>
> As usual proper credit would be appreciated.
>
> > >in message <20020820144703.16442.qmail at web20107.mail.yahoo.com> you wrote:
> > >
> > >>I`m trying to debug a multi-threaded application using gdbserver
> > >>on the remote/target side and I`m having some problems, the output
> > >>I got is depicted below:
> > >
> > >I'm not surprised. This is broken in most versions of GDB /
> > >gdbserver floating around.
> > >
> > >>I`m using gdbserver5.2.1 (I tried the one from HHL-2.0 Journeyman
> > >>and didn`t worked too) compiled by myself using Mvista HHL 2.0
> > >>tools and gdb 5.2.1 on my i386. Am I doing something wrong or
> > >>remote thread debugging is not supported by gdb? I have read
> > >>something about
> > >
> > >Let's say the support is incomplete :-)
> > >
> > >>problems with multi-thread application debugging but I thought
> > >>that it may be OK at this time... Could someone explain to me
> > >>what`s happening?
> > >
> > >Check out our ELDK (see http://www.denx.de/ELDK); it contains an
> > >extended / bug fixed version of GDB / gdbserver; remote target
> > >debugging of MT applications was one of the areas where we spend
> > >some work.
> > >
> > >If you're just looking for the patches: these can be found on our
> > >FTP server; the README including description of the test procedure
> > >is at ftp://ftp.denx.de/pub/ppc/patches/README-GDB-MT-Support

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