Hi, On 11/09/16 16:02, John Baldwin wrote: > On the other hand, doing the wakeup outside of the lock
avoids preempting during the wakeup only to immediately block on the lock and switch back to the thread that did the wakeup.
This can be predicted and avoided by the turnstiles iff cv_signal() is used under a lock. Else not.
Won't doing the wakeup outside the lock cause double preemtion? First at mtx_unlock() and then inside cv_signal()/cv_broadcast().
--HPS _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
