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

[John Gardiner Myers]

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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:

do_io(...);

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

You're spouting nonsense.

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