Re: Freeze in GC_suspend_handler

[Tom Tromey <tromey at redhat dot com>]

>>>>> "Daniel" == Daniel Bonniot <Daniel.Bonniot@inria.fr> writes:

Tom> I think the next thing to do is to try to see why this field
Tom> isn't initialized.  One way to do that would be to put a
Tom> watchpoint on the value and then see when/why it changes to 0.

Daniel> What are the precise commands to do that? I suppose using
Daniel> watch, but I don't know much about gdb. Can I watch only this
Daniel> instance of the field?

Yes.  What I typically do is find the address of the field, and then
watch it like this:

    watch *(int*) 0x....

This ensures you get a hardware watchpoint, so it will work quickly.

If the address isn't valid you'll have to play games to figure out
when it becomes valid.  Usually this involves setting a breakpoint at
the appropriate place.

Tom