14 Oct
2012
14 Oct
'12
8:48 a.m.
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