On Wed, 16 Oct 2002, John Gardiner Myers wrote:
> Davide Libenzi wrote:
>
> >I told you did not understand the API, this code won't work for edge
> >triggered APIs.
> >
> 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 ). 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(...);
}
and you consume only part of the I/O space with the first call to my_io(),
the second call will block _infinitely_.
- Davide
-
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This archive was generated by hypermail 2b29 : Wed Oct 23 2002 - 22:00:30 EST