[Python-ideas] re-implementing Twisted for fun and profit

[Richard Oudkerk]

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