[Bug 157755] [patch] gdb(1) hardware watchpoints do not work correctly in multi-threaded programs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=157755

--- Comment #7 from John Baldwin <jhb at FreeBSD.org> ---
Note that in theory dragonfly also supports PT_GET/SETDBREGS (though upstream
gdb does not have a config for Dragonfly), so I think it should stay in the
pan-BSD files rather than move to a FreeBSD-specific file.  I ended up doing
something similar, but using an inline iteration rather than iterate_threads()
(and I have an initial patch to move the debug register stuff into
x86bsd-nat.c).

This is the patchset I plan to post for review upstream:

https://github.com/bsdjhb/gdb/compare/thread_dbreg

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