Re: GDB server and threaded application

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.

--- Daniel Jacobowitz <drow@mvista.com> wrote:

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

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Kalpesh Jasapara wrote:

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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.

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in message [ref] you wrote:

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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.

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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 :-)

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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