f35dfff3de
If the owning reader is closing, wait for another reader (if there is one) to take ownership before closing the owner's pipe handles. To synchronize the ownership transfer, add events owner_needed_evt and owner_found_evt, and add methods owner_needed and owner_found to set/reset them. Modify the fifo_reader_thread function to wake up all non-owners when a new owner is needed. Make a cosmetic change in close so that fhandler_base::close is called only if we have a write handle. This prevents strace output from being littered with statements that the null handle is being closed.
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