Re: epoll (was Re: [PATCH] async poll for 2.5)

From: John Gardiner Myers (
Date: Thu Oct 17 2002 - 13:06:05 EST

Davide Libenzi wrote:

>>Nonsense. If you wish to make such a claim, you need to provide an
>>example of a situation in which it won't work.
>Your welcome. This is your code :
>for (;;) {
> fd = event_wait(...);
> while (do_io(fd) != EAGAIN);
>If the I/O space is not exhausted when you call event_wait(...); you'll
>never receive the event because you'll be waiting a 0->1 transaction
>without bringing the signal to 0 ( I/O space exhausted ).
My code above does exhaust the I/O space.

> That one is a
>typical use of poll() - select() - /dev/poll and you showed pretty clearly
>that you do not seem to understand edge triggered event APIs. If you code
>your I/O function like :
>int my_io(...) {
> if (event_wait(...))
> do_io(...);
This is not how my example is coded.

while (do_io(...) != EAGAIN);

is not equivalent to:


The former is guaranteed to exhaust the I/O space, the latter is not.

You're spouting nonsense.

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