[Bug dap/31380] [gdb/dap] Ensure responses are flushed to client before exiting

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31380

--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom Tromey from comment #1)
> +dap_check_log_file_re "JSON writer: terminating"
> 
> I suspect the issue is that the writer thread notifies
> the queue -- but then the log is written when the thread
> actually stops.  However, that means there is a race:
> gdb may stop before the thread exits.
> 
> I believe that adding a log just before the final
> call to task_done in the writer, then checking for this
> would work reliably.

I've addressed this by waiting in the DAP main thread for the JSON writer
thread to exit.  This ensures that the "JSON writer: terminating" is in the
log.

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