Re: [PATCH] Add FUTEX_CMP_REQUEUE futex op

[Jakub Jelinek]

On Mon, May 24, 2004 at 01:12:03AM -0700, Andrew Morton wrote:
> Jakub Jelinek <jakub@xxxxxxxxxx> wrote:
> >
> > That said, NPTL can deal with any of these variants and the decision
> >  is up to Martin I think (assuming the base patch gets accepted, that is).
> 
> Well the race is real and does need a kernel fix, so I queued it up.  I
> guess if the new argument to sys_futex() breaks some architecture they can
> independently add a new syscall for it, or send a fix.  Mutter.
> 
> It's a bit of a shame that you need to be a rocket scientist to 
> understand the futex syscall interface.  Bert, are you still maintaining
> the manpage?  If so, is there enough info here to update it?

The latest futex(2) or futex(4) manpage I saw doesn't mention FUTEX_REQUEUE
at all.
Also, any futex man page should probably SEE ALSO Ulrich's futex paper:
http://people.redhat.com/drepper/futex.pdf
which helps understanding how to successfully use futexes, because
it is certainly not trivial.

	Jakub
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