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Abstraction of a one-way pipe where the read end can be used in
`select.select`. Normally this is trivial, but Windows makes it nearly
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The pipe acts like an Event, which can be set or cleared. When set, the pipe
will trigger as readable in `select <select.select>`.
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On Windows, only an OS-level "WinSock" may be used in select(), but reads
and writes must be to the actual socket object.
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wraps a pipe into two pipe-like objects which are "or"d together to
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