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Introduce a 'fifo_client_handler' structure that can be used by a reader to communicate with a writer using an instance of the named pipe. An fhandler_fifo opened for reading creates a thread that does the following: - maintains a list of fifo_client_handlers - listens for_clients trying to connect - creates new pipe instances as needed so that there's always at least one available for connecting. The pipe instances are initially created in blocking mode, but they are set to be non-blocking after a connection is made. fhandler_fifo::raw_read now loops through the connected clients and reads from the first one that has data available. New fhandler_fifo methods: add_client, listen_client, listen_client_thread, check_listen_client_thread. Replace the create_pipe method by create_pipe_instance, which allows unlimited pipe instances. New helper functions: create_event, set_pipe_non_blocking.
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