[PATCH] event_machine: join reactor_thread if it is already running rather than falling through worker_loop

[Eric Wong]

"Mark J. Titorenko" <mark.titorenko at alces-software.com> wrote:
> Prior to the application of this patch, if an EventMachine
> reactor_thread has already been started elsewhere before the
> worker_loop is entered, the worker_loop exits as a second call to
> EM.run does not block the current thread.
> 
> This patch causes the worker_loop thread to join the reactor_thread if
> it is running.

Thanks Mark!  Pushed out as a12d2e64e04b5098f31e63a72ea8330b6c8f3a19
(line-wrapped commit message) to git://bogomips.org/rainbows.git