Threaded watchpoints

Threaded watchpoints

[Luis Machado]

Hi,

Some time ago (end of 2004/beginning of 2005) there was a long
discussion on the threaded watchpoints problem.

http://sourceware.org/ml/gdb-patches/2004-12/msg00256.html

Jeff Johnston wrote a considerable patch that would improve this on some
architectures (i386, ia64, amd64 and s390). Through the discussion, the
patch was updated a few times, but there wasn't a final conclusion to
this problem and i couldn't find any other posts from Jeff Johnston
since those days. Was there any conclusion on this? Some bits of Jeff's
patch were included upstream, but most of the patch was not.

I'm looking forward to start working on this problem for ppc32
architecture, in order to be able to use per-thread watchpoints, and i'd
like to clarify where we are sitting at regarding this problem.

Has any improvement been made to GDB? What's the current support for
this?

Best regards,
Luis


-- 
Luis Machado
Software Engineer 
IBM Linux Technology Center
LoP Toolchain/Debuggers' team
Phone: +55 19-2132-2218
T/L: 839-2218
e-mail: luisgpm@vnet.linux.ibm.com

Re: Threaded watchpoints

[Daniel Jacobowitz]

On Tue, Jun 26, 2007 at 02:49:51PM -0300, Luis Machado wrote:
> Jeff Johnston wrote a considerable patch that would improve this on some
> architectures (i386, ia64, amd64 and s390). Through the discussion, the
> patch was updated a few times, but there wasn't a final conclusion to
> this problem and i couldn't find any other posts from Jeff Johnston
> since those days. Was there any conclusion on this? Some bits of Jeff's
> patch were included upstream, but most of the patch was not.
> 
> I'm looking forward to start working on this problem for ppc32
> architecture, in order to be able to use per-thread watchpoints, and i'd
> like to clarify where we are sitting at regarding this problem.
> 
> Has any improvement been made to GDB? What's the current support for
> this?

Red Hat has an updated patch for this in their RPMs.  I've asked for
someone to submit it, I think, since I didn't want to reinvent it.

-- 
Daniel Jacobowitz
CodeSourcery

Re: Threaded watchpoints

[Jan Kratochvil]

[-- Attachment #1: Type: text/plain, Size: 467 bytes --]

On Tue, 26 Jun 2007 19:58:04 +0200, Daniel Jacobowitz wrote:
...
> Red Hat has an updated patch for this in their RPMs.  I've asked for
> someone to submit it, I think, since I didn't want to reinvent it.

Currently it is an incomplete fix, a small testcase for the Red Hat GDB branch
attached, it misses some of the parallel watchpoint events.
Working on it, the current patch version is available in public gdb-X.src.rpm
or submittable upon request.


Regards,
Jan

[-- Attachment #2: bz237096.tar.gz --]
[-- Type: application/x-gzip, Size: 1342 bytes --]