Flowdock
enclose() public

Prevents threads from being added to or removed from the receiving ThreadGroup.

New threads can still be started in an enclosed ThreadGroup.

ThreadGroup::Default.enclose        #=> #<ThreadGroup:0x4029d914>
thr = Thread.new { Thread.stop }    #=> #<Thread:0x402a7210 sleep>
tg = ThreadGroup.new                #=> #<ThreadGroup:0x402752d4>
tg.add thr
#=> ThreadError: can't move from the enclosed thread group
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