Re: gdbserver multithread ARM gdb-5.3/5.2

[Daniel Jacobowitz <drow@mvista.com>]

On Thu, Jul 31, 2003 at 02:27:25PM +0530, Vijay Saha, Noida wrote:
> Hi 
> 
> I am new to gdbserver debugging. So I have got many queries...some of them
> may be trivial..so forgive me for that...
> 
> I am trying to have a gdbserver for arm-linux target and x86/linux GDB host.
> I have tried using the GDB-5.2.1 but that gdbserver doesn't seem to support
> mutithreading.
> 
> Then I had downloaded the released GDB-5.3  through FTP from
> sources.redhat.com.
> Even the gdbserver of GDB-5.3 doesn't seem to work correctly for
> multithreaded applications.
> (gdb) info threads 
> 
> It only showed me the main thread ID and no other threads even if the test
> application had many threads.
> It even didn't stop at any breakpoint set on threads..
> 
> I think the released GDB -5.3 gdbserver is supposed to support
> multithreading debugging for ARM targets properly.
> 
> Moreover, On the GDB-patches mailing list I could find some PATCH mail from
> Danil Jacobowitz but it says something about "lin-thread.c"... but in
> GDB-5.3 I couldn't find any such file.
> Is it a totally new file or I have interpreted something incorrect..??

No, that file is obsolete.

> Is there any patch of gdbserver of gdb-5.3 or gdb-5.2 ??
> 
> To debug multithreaded applications, do I need to have the target arm-linux
> shared libraries of libthread_db.so.1 on GDB host as well..??
> If yes where to copy it..??

You don't need libthread_db.so.1.  You do need pretty much all other
libraries.  Please look in the manual under solib-absolute-prefix - I'm
not sure it's documented in older versions of the manual, but it's
there now.

> Has anyone supported GDB-5.2 gdbserver for thread debugging (remotely) ??
> 
> Can someone help me in making myself clear about the patches and GDB
> versions for multithreaded debugging through gdbserver ??
> 
> Is it possible that I use the gdbserver of GDB-5.3 and the GDB host of
> GDB-5.2 ??
> I know it won't be recommended but how much is this feasible??

I doubt it will work.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer