Ben Sander
b29fbf736d
Includes some tricky manipulation of the locks for contexts and streams. issue is that stealing a stream requires we lock the context to walk the streams to find a victim. To avoid deadlock, we can't have a stream locked when we lock the context. This implementation releases the stream lock, then acquires the context and selects the victim. A more stable implemenation might be to copy the stream list from a context so that a lock is not required to walk all streams. Smart shared_ptr could be used to prevent the streams from being deallocated during the walk.