[Bug gdb/17223] cannot do background execution in scripts

["dje at google dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17223

--- Comment #3 from dje at google dot com ---
(In reply to dje from comment #1)
> A potential hacky workaround is to feed the script to stdin.
> One may need to do "set interactive-mode on".
> But see pr 17224, currently trying this segvs.

As an experiment, I find I can get gdb to process inferior events if I add
enough nops to the script.  E.g., do "info threads", do some mindless things
like "pwd", do another "info threads", etc. and slowly the threads start to
appear.

In this case stdin is "hogging" the event queue.
IWBN, at least in this case, if inferior events hogged the event queue.
Are there some cases where we want the former and some where we want the
latter?
Or can we, for example, keep processing inferior events until there are no
more?

It may be that some command ("wait" or whatever) that one can put in a script
to explicitly process all current inferior events has sufficient utility to
warrant adding.

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