You were right...see my update to the OP.

I forgot that TQD::enqueue() doesn't block, TQD::enqueue_and_wait() does...which also explains my original issue, which relies on Thread::Apartment (also based on TQD) and was using a simplex method to pass the fileno over to the worker thread (simplex methods use nonblocking enqueue_simplex(), rather than enqueue_and_wait(), for the RPC to the apt. threaded object).

In reply to Re^4: Passing sockets between segregated threads by renodino
in thread Passing sockets between segregated threads by renodino

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