Re: [PATCH] /dev/epoll update ...

From: Jamie Lokier (
Date: Mon Sep 24 2001 - 17:21:23 EST

Davide Libenzi wrote:
> Sure you can avoid the scan, if you pick up one event at a time. To
> be compared to /dev/epoll you need the signal-per-fd patch plus a
> method to collect the whole event-set in a single system call ( see
> perfs ).

Yes, I agree. A variant of sigwaitinfo that will return multiple queued
signals was mentioned ages ago, but because the siginfo structure is
much larger than is needed, that isn't a very effective use of cache.

Something specialised for fd events is more appropriate IMO. Large
numbers of queued RT signals aren't used for anything else AFAIK anyway,
not even timers.

-- Jamie
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