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Among all the open readers of a FIFO, one is declared to be the owner. This is the only reader that listens for client connections, and it is the only one that has an accurate fc_handler list. Add shared data and methods for getting and setting the owner, as well as a lock to prevent more than one reader from accessing these data simultaneously. Modify the fifo_reader_thread so that it checks the owner at the beginning of its loop. If there is no owner, it takes ownership. If there is an owner but it is a different reader, the thread just waits to be canceled. Otherwise, it listens for client connections as before. Remove the 'first' argument from create_pipe_instance. It is not needed, and it may be confusing in the future since only the owner knows whether a pipe instance is the first. When opening a reader, don't return until the fifo_reader_thread has time to set an owner. If the owner closes, indicate that there is no longer an owner. Clear the child's fc_handler list in dup, and don't bother duplicating the handles. The child never starts out as owner, so it can't use those handles. Do the same thing in fixup_after_fork in the close-on-exec case. In the non-close-on-exec case, the child inherits an fc_handler list that it can't use, but we can just leave it alone; the handles will be closed when the child is closed.
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