On Fri, Aug 23, 2013 at 4:51 PM, John Baldwin <j...@freebsd.org> wrote: > On Friday, August 23, 2013 10:12:39 am Davide Italiano wrote: >> Author: davide >> Date: Fri Aug 23 14:12:39 2013 >> New Revision: 254703 >> URL: http://svnweb.freebsd.org/changeset/base/254703 >> >> Log: >> Introduce callout_init_rm() so that callouts can be used in conjunction >> with rmlocks. This works only with non-sleepable rm because handlers run >> in SWI context. While here, document the new KPI in the timeout(9) >> manpage. > > It also only works with exclusive locks. (lc_unlock/lc_lock only handle > write locks for rmlocks). > > -- > John Baldwin
Thanks for pointing out this. I think it would be nice to have lc_lock/lc_unlock working both for shared and exclusive locks but I'm not 100% sure about all the implications/complications. From what I see for rwlocks asserting if a lock is held in read-mode is really cheap (check against a flag) while for rmlocks the assertion relies on traversing the tracker list for the rmlock so I'm worried this operation could be expensive. What's your opinion about? Thanks, -- Davide "There are no solved problems; there are only problems that are more or less solved" -- Henri Poincare _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
