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Add a take_ownership method, used by raw_read and select.cc:peek_fifo. It wakes up all fifo_reader_threads and allows the caller to become owner. The work is done by the fifo_reader_threads. For synchronization we introduce several new fhandler_fifo data members and methods: - update_needed_evt signals the current owner to stop listening for writer connections and update its fc_handler list. - shared_fc_handler() gets and sets the status of the fc_handler update process. - get_pending_owner() and set_pending_owner() get and set the reader that is requesting ownership. Finally, a new 'reading_lock' prevents two readers from trying to take ownership simultaneously.
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