Threading cleanup.. part 2 of several.

Make part of John Birrell's KSE patch permanent..
Specifically, remove:
Any reference of the ksegrp structure. This feature was
never fully utilised and made things overly complicated.
All code in the scheduler that tried to make threaded programs
fair to unthreaded programs.  Libpthread processes will already
do this to some extent and libthr processes already disable it.

Also:
Since this makes such a big change to the scheduler(s), take the opportunity
to rename some structures and elements that had to be moved anyhow.
This makes the code a lot more readable.

The ULE scheduler compiles again but I have no idea if it works.

The 4bsd scheduler still reqires a little cleaning and some functions that now do
ALMOST nothing will go away, but I thought I'd do that as a separate commit.

Tested by David Xu, and Dan Eischen using libthr and libpthread.

1 files changed, 4 insertions, 16 deletions

diff --git a/sys/kern/kern_clock.c b/sys/kern/kern_clock.c
index cd98bdd..a3732a8 100644
--- a/sys/kern/kern_clock.c
+++ b/sys/kern/kern_clock.c
@@ -203,23 +203,12 @@ hardclock_cpu(int usermode)
 	mtx_lock_spin_flags(&sched_lock, MTX_QUIET);
 	sched_tick();
 #ifdef KSE
+#if 0  /* for now do nothing */
 	if (p->p_flag & P_SA) {
-		/* XXXKSE What to do? */
-	} else {
-		pstats = p->p_stats;
-		if (usermode &&
-		    timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) &&
-		    itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0) {
-			p->p_sflag |= PS_ALRMPEND;
-			td->td_flags |= TDF_ASTPENDING;
-		}
-		if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value) &&
-		    itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0) {
-			p->p_sflag |= PS_PROFPEND;
-			td->td_flags |= TDF_ASTPENDING;
-		}
+		/* XXXKSE What to do? Should do more. */
 	}
-#else
+#endif
+#endif
 	pstats = p->p_stats;
 	if (usermode &&
 	    timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) &&
@@ -232,7 +221,6 @@ hardclock_cpu(int usermode)
 		p->p_sflag |= PS_PROFPEND;
 		td->td_flags |= TDF_ASTPENDING;
 	}
-#endif
 	mtx_unlock_spin_flags(&sched_lock, MTX_QUIET);
 
 #ifdef	HWPMC_HOOKS