thread_group behavior question

From: sdussin sdussin1_at_[hidden])
Date: 2003-02-05 16:31:30

I've been using Boost for several months now, and I must say I've been
very happy with it. I've primarily been using the threads and regex
stuff from the library, and I have a question regarding the behavior
of the thread_group.join_all method.

In my current situation, I have a thread_group which launches several
threads of execution for background servers, on an as-needed basis.  If
it becomes necessary to shutdown those background servers, I issue a
join_all on the thread_group to wait for all activity to cease, then I
can clear up the server instances themselves.

If I issue a join_all from a thread and, while waiting for the
join_all to exit, another thread creates a thread within my
thread_group, what is expected? Will the join_all now wait for the
original threads, as well as the newcomer, or will it only wait on the
threads which were running at the time the join_all was called??

Thanx,
  Steve Dussinger