Re: RFA: gdb/568, messy thread exits

[Jim Blandy <jimb@redhat.com>]

Daniel Jacobowitz <drow@mvista.com> writes:
> Here's the interesting part.  It occurs whenever thread_db can not look
> up the LWP<->Thread mapping in the child.  If, for instance, the child
> has disappeared, we can not look up its mapping any more.  Or if some
> other circumstance causes the mapping to be unavailable, like an
> exec(); there's another PR about that case.

I dunno.  I mean, if someone asks you to look up a TID's LWP, and you
can't, that seems like an error, no?  Isn't it supposed to be better
to flag errors early than let the thing go crashing on through the
forest with bogus information?

I'm glad you found a patch that addresses the PR I filed, but there's
no way I can approve this patch --- not because I'm sure it's wrong,
but because I'm sure I have no idea whether it's right or wrong.  :)

> Of course, it is also my opinion that we perform the mapping a stupid
> number of times.  ``set debug target 1'' and run a threaded program;
> you'll see it happen over and over again.

Yes, I noticed this: amazing numbers of huge memory transfers.  Yuck.