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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