Problems with GDB 5.1 and Pthreads

Problems with GDB 5.1 and Pthreads

[Marcos Pindado Sebastián]

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Hi.
I am developing under linux SlackWare 7.0 and have several problems with gdb and multithreaded programs.
Gdb is 5.1 configured on P3 PC.
- Every call to a pthread function results in the reception of a SIG32. I have tried to resolve this by ignoring that signal, but...
- It does not appear any message indicating a new thread is created.
- I don't see any thread when writing : info threads.
- The command " thread x" does not work, it says it has no id thread.
- When I set a breakpoint in the code that a thread other than main thread the program does not stop in it, but recives a SIGTRAP when that thread exists.

It seems there is no thread over there although simple multithread programs work fine (when not debugging) so I am assuming Slackware does well with threads.
Is there any configuration option I have miss? Is there any patch to resolve this?

Thank you very much.


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Re: Problems with GDB 5.1 and Pthreads

[Daniel Jacobowitz]

Probably you do not have libthread_db installed.  Glibc may not be new
enough.

On Thu, Dec 13, 2001 at 05:54:57PM +0100, Marcos Pindado Sebastián wrote:
> Hi.
> I am developing under linux SlackWare 7.0 and have several problems with gdb and multithreaded programs.
> Gdb is 5.1 configured on P3 PC.
> - Every call to a pthread function results in the reception of a SIG32. I have tried to resolve this by ignoring that signal, but...
> - It does not appear any message indicating a new thread is created.
> - I don't see any thread when writing : info threads.
> - The command " thread x" does not work, it says it has no id thread.
> - When I set a breakpoint in the code that a thread other than main thread the program does not stop in it, but recives a SIGTRAP when that thread exists.
> 
> It seems there is no thread over there although simple multithread programs work fine (when not debugging) so I am assuming Slackware does well with threads.
> Is there any configuration option I have miss? Is there any patch to resolve this?
> 
> Thank you very much.
> 

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

Re: Problems with GDB 5.1 and Pthreads

[Michael Snyder]

> Marcos Pindado Sebastián wrote:
> 
> Hi.
> I am developing under linux SlackWare 7.0 and have several problems
> with gdb and multithreaded programs.
> Gdb is 5.1 configured on P3 PC.
> - Every call to a pthread function results in the reception of a
> SIG32. 

This is typical of a mismatch between gdb and glibc.
Newer versions of gdb use a newer version of glibc to
interface to the pthread library.