- Add a new sched_affinity() api to be used in the upcoming cpuset

implementation.
 - Add empty implementations of sched_affinity() to 4BSD and ULE.

Sponsored by:	Nokia

sys/kern/sched_4bsd.c

@@ -1402,5 +1402,10 @@ sched_fork_exit(struct thread *td)
 	THREAD_LOCK_ASSERT(td, MA_OWNED | MA_NOTRECURSED);
 }
 
+void
+sched_affinity(struct thread *td)
+{
+}
+
 #define KERN_SWITCH_INCLUDE 1
 #include "kern/kern_switch.c"

sys/kern/sched_ule.c

@@ -2492,6 +2492,11 @@ sched_pctcpu(struct thread *td)
 	return (pctcpu);
 }
 
+void
+sched_affinity(struct thread *td)
+{
+}
+
 /*
  * Bind a thread to a target cpu.
  */

sys/sys/sched.h

@@ -32,7 +32,7 @@
  */
 
 /*-
- * Copyright (c) 2002, Jeffrey Roberson <jeff@freebsd.org>
+ * Copyright (c) 2002-2008, Jeffrey Roberson <jeff@freebsd.org>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -129,6 +129,7 @@ static __inline void sched_pin(void);
 void	sched_unbind(struct thread *td);
 static __inline void sched_unpin(void);
 int	sched_is_bound(struct thread *td);
+void	sched_affinity(struct thread *td);
 
 /*
  * These procedures tell the process data structure allocation code how