GDB: non-stop mode.

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+[[meta copyright="Copyright © 2008 Free Software Foundation, Inc."]]
+
+[[meta license="""[[toggle id="license" text="GFDL 1.2+"]][[toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts.  A copy of the license
+is included in the section entitled
+[[GNU_Free_Documentation_License|/fdl]]."]]"""]]
+
+GNU GDB's `gnu-nat.c` doesn't support *non-stop* mode.
+
+Also, from <http://lists.gnu.org/archive/html/bug-hurd/2008-10/msg00045.html>,
+GNU GDB's Pedro Alves:
+
+> I also notice that when going through the shell in non-stop mode, it would be
+> more correct to resume all threads --- we don't want non-stop and its
+> scheduler-locking to apply to the shell.  Basically, non-stop should be off
+> if there are pending execs.  This was an existing issue, and doesn't affect
+> linux today, so I'll just ignore that for now, as it needs more tweaking to
+> fix.