On Thursday 24 August 2006 16:16, Julian Elischer wrote: > Konstantin Belousov wrote: > > >kib 2006-08-24 10:16:01 UTC > > > > FreeBSD src repository > > > > Modified files: (Branch: RELENG_6) > > share/man/man9 lock.9 > > Log: > > MFC rev.1.14: > > Note that LK_UPGRADE may drop the shared lock before taking the > > exclusive one. > > > > > > > excuse my ignorance but I though that the whole aim of an upgrade was to > make sure that > you did NOT drop it before getting the exclusive lock..( or it fails and > you back out and retry)
This is why sx and rw locks only have a try_upgrade and not a blocking upgrade. The calling code can then do a sunlock and blocking xlock and make sure they redo any needed checks, etc. > > Reviewed and edited by: tegge > > Approved by: pjd (mentor) > > > > Revision Changes Path > > 1.12.2.2 +2 -0 src/share/man/man9/lock.9 > > > > > -- John Baldwin _______________________________________________ cvs-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/cvs-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"
