[Python-ideas] re-implementing Twisted for fun and profit (original) (raw)

Richard Oudkerk shibturn at gmail.com
Sun Oct 14 14:48:30 CEST 2012

On 14/10/2012 6:29am, Greg Ewing wrote:

Not sure if this is relevant, but I'd just like to point out that the behaviour of select() in this respect is actually edge triggered by this definition. Once it has reported that a given file descriptor is ready, it won't report that file descriptor again until you do something with it. This can be a subtle source of bugs in select-based code if you're not aware of it.

Unless I have misunderstood you, the following example contradicts that:

import os, select r, w = os.pipe() os.write(w, b"hello") 5 select.select([r], [], []) ([3], [], []) select.select([r], [], []) ([3], [], [])

-- Richard

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