Returned by Posix.select()
An instance of this class is returned by the function Posix.select(). It contains three arrays (read, write, and except), and a number (timeout). The arrays contain references to the objects (if any) which caused the Posix.select() call to finish, and timeout contains a number specifying the number of seconds left before the call was due to time out (it will be 0 if the select() finished because of a timeout).
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