CVS commit: src/sys/kern

[Andrew Doran <ad%netbsd.org@localhost>]

Module Name:    src
Committed By:   ad
Date:           Wed Oct  3 11:20:10 UTC 2007

Modified Files:
        src/sys/kern: kern_synch.c

Log Message:
- sched_yield: When yielding, drop the priority to MAXPRI ensuring that the
  calling thread really does yield. The scheduler will adjust it back to a
  reasonable level within 1 second. This contradicts POSIX, which specifies
  that sched_yield() put the thread onto the back of its current runqueue.
  However, POSIX doesn't really have any business specifying what should
  happen for SCHED_OTHER (i.e.  a timesharing scheduler like ours), and
  Java, MySQL and libpthread rely on sched_yield() doing something useful.

- mi_switch: adjust spc_curpriority and newl->l_priority if we avoided
  the runqueues and are doing a direct switch. Since nothing currently
  does that, there should be no functional change.


To generate a diff of this commit:
cvs rdiff -r1.197 -r1.198 src/sys/kern/kern_synch.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.