Followup to: <20020315060829.L4836@parcelfarce.linux.theplanet.co.uk>
By author: Joel Becker <jlbec@evilplan.org>
In newsgroup: linux.dev.kernel
>
> On Fri, Mar 15, 2002 at 04:39:50PM +1100, Rusty Russell wrote:
> > Yep, sorry, my mistake. I suggest make it a relative "struct timespec
> > *" (more futureproof that timeval). It would make sense to split the
> > interface into futex_down and futex_up syuscalls, since futex_up
> > doesn't need a timeout arg, but I haven't for the moment.
>
> Why waste a syscall? The user is going to be using a library
> wrapper. They don't have to know that futex_up() calls sys_futex(futex,
> FUTEX_UP, NULL);
>
Syscalls are (by and large) cheap. Extra dispatches, however, hurt.
-hpa
-- <hpa@transmeta.com> at work, <hpa@zytor.com> in private! "Unix gives you enough rope to shoot yourself in the foot." http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com> - 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 : Fri Mar 15 2002 - 22:00:19 EST