Jack Lloyd wrote:
On Mon, Oct 17, 2005 at 02:43:19PM -0700, Lev Walkin wrote:
Michael Sierchio wrote:
[skip]
Who implements poll with select should suffer a fate worse than
death -- waking up a thousand sleeping threads to see if one
has some i/o ready is what poll was designed to avoid.
I think you're confusing a file I/O notification with mutual exclusion
and condition variables paradigm, another kind of IPC. The following
page provides necessary background information:
I believe Michael is actually talking about the "thundering herd" problem, when
many processes are all waiting on a single event, which only one of them will
end up responding to. That is a classic problem affecting some uses of select
(and also accept, and IIRC a few other socket calls as well).
Including poll().
--
Lev Walkin
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