Re: GDB server and threaded application

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@mvista.com> wrote:

On Tue, Mar 25, 2003 at 09:39:01PM -0800, Vladimir
Gurevich wrote:

quoted

Kalpesh Jasapara wrote:

quoted

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.

quoted

quoted

in message [ref] you wrote:

quoted

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.

quoted

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 :-)

quoted

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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