[Python-Dev] Status of PEP 3145 (original) (raw)

[Python-Dev] Status of PEP 3145 - Asynchronous I/O for subprocess.popen

Richard Oudkerk shibturn at gmail.com
Fri Mar 28 23:09:11 CET 2014

On 28/03/2014 06:35 pm, Josiah Carlson wrote:

If it were me, I'd define three methods, with longer names to clarify what they do, e.g. proc.writenonblocking(data) data = proc.readnonblocking() data = proc.readstderrnonblocking()

Easily doable. To implement write_nonblocking() on Windows, do you intend to use SetNamedPipeHandleState() with PIPE_NOWAIT? The documentation discourages using this:

Note that nonblocking mode is supported for compatibility with
Microsoft LAN Manager version 2.0 and should not be used to
achieve asynchronous input and output (I/O) with named pipes.

And I guess you will need to use a poll/sleep loop to simulate blocking or multiplexing. If you want expect-like behaviour then you need some sort of multiplexing.

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