Add a third mode to "breakpoints always-inserted", and make it the default

[Pedro Alves]

Sandra has checked in the initial non-stop user docs, which include
an example of the list of commands currently needed to enable
non-stop in the CLI.

I'm updating this patch to remove the "set breakpoints
always-inserted 1" line, because if this patch is installed, it is
not needed anymore by default.

On Tuesday 12 August 2008 00:34:24, Pedro Alves wrote:
> Non-stop mode requires that breakpoints always be inserted
> in the inferior.  We currently set that with "set breakpoints
> always-inserted" prior to switching to non-stop mode with "set non-stop
> on".
>
> The default setting of "set breakpoints always-inserted" is "off",
> as that is how GDB has been behaving for ages.
>
> Since non-stop requires breakpoints always-in, its just cumbersome
> to have to issue more than one command to enable non-stop mode.
>
> So, this patch changes the "set breakpoints always-inserted" setting to
> be a three-state.  on and off, the same as before, and a new mode,
> "follow-non-stop".  In the latter mode, GDB will behave as "on", if
> we're in non-stop mode, and as "off" if we're in all-stop mode.
>
> This mode will be the default.
>
>  (gdb) show non-stop
>  Controlling the inferior in non-stop mode is off.
>
> We're in all-stop.
>
>  (gdb) show breakpoint always-inserted
>  Always inserted breakpoint mode is follow-non-stop (currently off).
>
> GDB shows that the effect is as if "off".
>
>  (gdb) set non-stop on
>
> Turns non-stop on.
>
>  (gdb) show breakpoint always-inserted
>  Always inserted breakpoint mode is follow-non-stop (currently on).
>
> GDB shows that the effect is as if "on".
>
>  (gdb) set non-stop off
>
> Back to all-stop.
>
>  (gdb) set breakpoint always-inserted on
>
> Force "on".  Useful for testing.
>
>  (gdb) show breakpoint always-inserted
>  Always inserted breakpoint mode is on.
>
> Now GDB shows that "on", independently of the non-stop mode.
>
> What do you think?
>
> If the idea is sound, does the patch look ok?
> How about the docs?

-- 
Pedro Alves
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