On Fri, Jan 15, 2010 at 06:11:24PM +0100, Peter Zijlstra wrote: > On Fri, 2010-01-15 at 08:58 -0800, Darren Hart wrote: > > The futex man-pages (2,7) from version 3.15-1 and at least a few earlier > > versions are considerably out of date with respect to the current > > implementation. They don't document newer op codes, such as: > > > > FUTEX_WAIT_BITSET > > FUTEX_WAKE_BITSET > > FUTEX_WAKE_OP > > FUTEX_LOCK_PI > > FUTEX_UNLOCK_PI > > FUTEX_WAIT_REQUEUE_PI > > FUTEX_CMP_REQUEUE_PI > > > > These new wait op codes now use absolute timeouts, while the original > > FUTEX_WAIT uses a relative timeout. Lastly, and most importantly, glibc > > has removed the futex() wrapper to syscall(SYS_futex, ...). With that in > > mind, would people prefer that we simply remove the futex man-pages > > (2,7)? > > A readable text about the interaction between the futex value and the > various futex ops and how to build proper locking primitives with them > would be helpful I think, however doing that in the form of a locking > library (as has been suggested at KS) seems plenty fine to me. > > Readable code is much better than rambling English at conveying this > stuff. http://people.redhat.com/drepper/futex.pdf is pretty good description, unfortunately also outdated by now. Perhaps it would be interesting to convert this into some kind of wiki form with Ulrich's permission? Petr "Pasky" Baudis -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
