Robert Hancock wrote:
John Clark wrote:
I built the latest GDB-6.3, as well as rebuilt glibc-2.3.5, and now
when I step through the
main code line, which creates the tasks (I'm using the pthreads.c
from the GDB testsuite), I do
not getany output from:
info threads
When I set a break point on the entry point of one of the
soon-to-be-created threads,
I get a diagnostic message:
Program terminated with signal SIGTRAP, Trace/Breakpoint trap.
The program no longer exists.
Are you sure your glibc and gdb were both configured to support
threads when they were compiled?
The application that I'm working with 'works', in the sense that when I
do a 'ps' there are several processes
listed under the app name, corresponding to the created threads.
When I run gdb with the app, it does load /lib/libthread_db.so.1, so my
presumption here is that gdb has
been thread enabled.
Since the app is pretty portable, and I've been using NetBSD to develop
co-develop it, I can run gdb
on the NetBSD side, and 'things' seem to work better. There are still
some wyrd operational issues
on the NetBSD, but at least when I set a break point in a thread, it
works, and when I do a
'info threads' command to gdb, it gives a reasonable out put of the list
of threads. Since the NetBSD
implementation of threads is 'new' to the kernel, I do expect some problems.
Now, because the thread implementation is different between NetBSD and
Linux, and it seems that Linux
creates distinct 'processes' for the threads, I'm wondering if I have
not correctly configured my kernel,
or if there is something special one has to do to allow gdb to write to
one of the created thread processes.
Also, I do believe I'm using the NPTL package for threads. Is there a
way to absolutely tell without
question?
Thanks
John Clark
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