- Remove setrunqueue and replace it with direct calls to sched_add().

   setrunqueue() was mostly empty.  The few asserts and thread state
   setting were moved to the individual schedulers.  sched_add() was
   chosen to displace it for naming consistency reasons.
 - Remove adjustrunqueue, it was 4 lines of code that was ifdef'd to be
   different on all three schedulers where it was only called in one place
   each.
 - Remove the long ifdef'd out remrunqueue code.
 - Remove the now redundant ts_state.  Inspect the thread state directly.
 - Don't set TSF_* flags from kern_switch.c, we were only doing this to
   support a feature in one scheduler.
 - Change sched_choose() to return a thread rather than a td_sched.  Also,
   rely on the schedulers to return the idlethread.  This simplifies the
   logic in choosethread().  Aside from the run queue links kern_switch.c
   mostly does not care about the contents of td_sched.

Discussed with:	julian

 - Move the idle thread loop into the per scheduler area.  ULE wants to
   do something different from the other schedulers.

Suggested by:	jhb

Tested on:	x86/amd64 sched_{4BSD, ULE, CORE}.

1 files changed, 11 insertions, 0 deletions

diff --git a/sys/sys/sched.h b/sys/sys/sched.h
index a9f1748..1342906 100644
--- a/sys/sys/sched.h
+++ b/sys/sys/sched.h
@@ -115,6 +115,8 @@ void	sched_clock(struct thread *td);
 void	sched_rem(struct thread *td);
 void	sched_tick(void);
 void	sched_relinquish(struct thread *td);
+struct thread *sched_choose(void);
+void	sched_idletd(void *);
 
 /*
  * Binding makes cpu affinity permanent while pinning is used to temporarily
@@ -145,6 +147,15 @@ sched_unpin(void)
 	curthread->td_pinned--;
 }
 
+/* sched_add arguments (formerly setrunqueue) */
+#define	SRQ_BORING	0x0000		/* No special circumstances. */
+#define	SRQ_YIELDING	0x0001		/* We are yielding (from mi_switch). */
+#define	SRQ_OURSELF	0x0002		/* It is ourself (from mi_switch). */
+#define	SRQ_INTR	0x0004		/* It is probably urgent. */
+#define	SRQ_PREEMPTED	0x0008		/* has been preempted.. be kind */
+#define	SRQ_BORROWING	0x0010		/* Priority updated due to prio_lend */
+
+
 /* temporarily here */
 void schedinit(void);
 void sched_init_concurrency(struct proc *p);