[RFC] gdb/674: GDB/MI No way to know the current selected thread (fwd)

[Andrew Cagney]

> ---------- Forwarded message ----------
> 
>>Number:         674
>>Category:       gdb
>>Synopsis:       GDB/MI No way to know the current selected thread
>>Description:
> 
> -thread-list-ids does not  indicate which is the selected thread
> 
> For example, with "info threads" a little star "*" will say who is
> the current thread.
> ---------- end forwarded message ----------
> 
> Would it be acceptable to change do_captured_list_thread_ids so that for 
> newer MI versions (>=2) we simply append the current thread to the output?

Should this be an event anyway? (like selected-frame event).
Info threads can be an expensive operation.

> Now:
> ^done,thread-ids={thread-id="1",thread-id="2",thread-id="3"},number-of-threads="3"
> 
> [BTW, is number-of-threads really necessary? When will number-of-threads 
> differ from the number of thread-ids listed?]

I don't know.

> Proposed change:
> ^done,thread-ids={thread-id="1",thread-id="2",thread-id="3"},number-of-threads="3",current_thread="1"

It should be called ``selected-thread''.  In GDB, ``current'' and 
``selected'' both have a special meaning.

> I guess we should also change to use ui_out_list_begin/end instead of 
> ui_out_tuple_begin/end?

Yep.

Andrew