[Bug cli/30771] GDB needs a silent thread-selecting command akin to "select-frame"

["moshe.rubin at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30771

--- Comment #6 from Moshe Rubin <moshe.rubin at gmail dot com> ---
You were right - a local "pipe" custom command was getting automatically
loaded.  Sorry about that <g>.

Examining its code, and that of other solutions for passing internal command
output to an external program (https://stackoverflow.com/a/50359976), they all
suffer from the same drawback that they use gdb.execute(cmd, to_string=True)
and then pipe the output to the external tool. gdb.execute("thread 2",
to_string=True) returns the output as a string, but also displays it to the
screen.  The fact that gdb.execute(<cmd>, to_string=True) does not always
suppress screen output is a bug and should be fixed.created and fixed.

However, thanks to your comment about InferiorThread.switch(), I believe we
have a solution, even for gdb 8.2!

In my case, when gdb opens my core, I want to iterate over all threads in it
(i.e., the current inferior) without any screen output.

To determine the number of threads in the current inferior:

    (gdb) python print(len(gdb.selected_inferior().threads()))
    17

From the gdb command prompt, select each thread one at a time by specifying the
target thread object and calling the switch() function:

    (gdb) python gdb.selected_inferior().threads()[0].switch()
    (gdb) thread
    [Current thread is 17 (LWP 631)]
    (gdb) python gdb.selected_inferior().threads()[1].switch()
    (gdb) thread
    [Current thread is 16 (LWP 630)]
    (gdb) python gdb.selected_inferior().threads()[2].switch()
    (gdb) thread
    [Current thread is 15 (LWP 629)]
    . . .
    (gdb) python gdb.selected_inferior().threads()[16].switch()
    (gdb) thread
    [Current thread is 1 (LWP 598)]
    (gdb)

The main thing to note is the ability to switch/select a different thread with
*no* screen output.

Kudos and thanks to you, Tom, for suggesting this power user method.

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