On Sun, 22 Apr 2001, Alon Ziv wrote:
> Well, that's the reason for my small-negative-integer semaphore-FD idea...
> (It won't support select() easily, but poll() is prob'ly good enough)
> Still, there is the problem of read()/write()/etc. semantics; sure, we can
> declare that 'negative FDs' have their own semantics which just happen to
> include poll(), but it sure looks like a kludge...
You _still_ don't get it. The question is not "how to add magic kernel
objects that would look like descriptors and support a binch of
ioctls, allowing to do semaphores", it's "do we need semaphores
to be kernel-level objects". Implementation with pipes allows to avoid
the magic crap - they are real, normal pipes - nothing special from
the kernel POV. read(), write(), etc. are nothing but reading and writing
for pipes.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Mon Apr 23 2001 - 21:00:42 EST