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wait 

        # IO.wait

(from ruby core)
---
    io.wait(events, timeout) -> event mask or false.
    io.wait(timeout = nil, mode = :read) -> event mask or false.

---

Waits until the IO becomes ready for the specified events and returns
the subset of events that become ready, or `false` when times out.

The events can be a bit mask of `IO::READABLE`, `IO::WRITABLE` or
`IO::PRIORITY`.

Returns `true` immediately when buffered data is available.

Optional parameter `mode` is one of `:read`, `:write`, or `:read_write`.

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