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Attempt to generalize the "feeder" part of a `.Channel`: an object which can be
read from and closed, but is reading from a buffer fed by another thread.  The
read operations are blocking and can have a timeout set.
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Indicates that a timeout was reached on a read from a `.BufferedPipe`.
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A buffer that obeys normal read (with timeout) & close semantics for a
file or socket, but is fed data from another thread.  This is used by
`.Channel`.
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Set an event on this buffer.  When data is ready to be read (or the
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ready, the event will be cleared.

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Feed new data into this pipe.  This method is assumed to be called
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Read data from the pipe.  The return value is a string representing
the data received.  The maximum amount of data to be received at once
is specified by ``nbytes``.  If a string of length zero is returned,
the pipe has been closed.

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seconds, or ``None`` for no timeout.  If a float is given, a
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before any data arrives.

:param int nbytes: maximum number of bytes to read
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    maximum seconds to wait (or ``None``, the default, to wait forever)
:return: the read data, as a ``str`` or ``bytes``

:raises:
    `.PipeTimeout` -- if a timeout was specified and no data was ready
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Clear out the buffer and return all data that was in it.

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Close this pipe object.  Future calls to `read` after the buffer
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Return the number of bytes buffered.

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