[issue22013] Add at least minimal support for thread groups

[Raymond Hettinger]

Raymond Hettinger added the comment:

c++
"thread_group provides for a collection of threads that are related in some fashion."
http://www.boost.org/doc/libs/1_35_0/doc/html/thread/thread_management.html#thread.thread_management.threadgroup

perl
"Thread::Pool - group of threads for performing similar jobs"
http://search.cpan.org/dist/Thread-Pool/lib/Thread/Pool.pm

> Even the Java API doesn't look very useful.

This isn't a Java-only concept.  It is widely available.

haskell
"This module extends Control.Concurrent.Thread with the ability to wait for a group of threads to terminate."
http://hackage.haskell.org/package/threads-0.5.0.2/docs/Control-Concurrent-Thread-Group.html

ruby
"ThreadGroup provides a means of keeping track of a number of threads as a group."
http://www.ruby-doc.org/core-2.1.2/ThreadGroup.html

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