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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