On Wed, Feb 18, 2015 at 04:53:34PM +0100, Oleg Nesterov wrote: > On 02/17, Paul E. McKenney wrote: > > > > | mb | wmb | rmb | rbd | acq | rel | ctl | > > -----+-------+-------+-------+-------+-------+-------+-------+ > > mb | Y | | Y | y | Y | | Y + > > -----+-------+-------+-------+-------+-------+-------+-------+ > > wmb | Y | | Y | y | Y | | Y + > > -----+-------+-------+-------+-------+-------+-------+-------+ > > rmb | | | | | | | + > > -----+-------+-------+-------+-------+-------+-------+-------+ > > rbd | | | | | | | + > > -----+-------+-------+-------+-------+-------+-------+-------+ > > acq | | | | | | | + > > -----+-------+-------+-------+-------+-------+-------+-------+ > > rel | Y | | Y | y | Y | | Y + > > -----+-------+-------+-------+-------+-------+-------+-------+ > > ctl | | | | | | | + > > -----+-------+-------+-------+-------+-------+-------+-------+ > > OK, so "acq" can't pair with "acq", and I am not sure I understand.
Please consider the table in the context of message passing; that is what Paul proposed. Your example from sysvsems, while interesting, would not fit the general scenario of message passing. This too illustrates a problem with that approach, people can't read, so they'll pick the wrong table to look at. I really think having just the _one_ table with obvious pairings marked, and everything not marked in the table needs careful reading. And acq-acq pairing would be a careful one in my book. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
