slightly gratuitous reorg of scheduler code

	* rename select (very loaded word) nextgoroutine
	* separate out "enter scheduler" (sys·gosched)
	  from the scheduler itself (scheduler)

R=r
APPROVED=r
DELTA=36  (17 added, 15 deleted, 4 changed)
OCL=13772
CL=13774

src/runtime/proc.c

@@ -90,7 +90,7 @@ tracebackothers(G *me)
 }
 
 G*
-select(void)
+nextgoroutine(void)
 {
 	G *gp;
 
@@ -114,34 +114,36 @@ select(void)
 }
 
 void
-gom0init(void)
-{
-	gosave(&m->sched);
-	sys·gosched();
-}
-
-void
-sys·gosched(void)
+scheduler(void)
 {
 	G* gp;
-
-	if(g != m->g0) {
-		if(gosave(&g->sched))
-			return;
-		g = m->g0;
-		gogo(&m->sched);
-	}
-	gp = select();
+	
+	gosave(&m->sched);
+	gp = nextgoroutine();
 	if(gp == nil) {
 //		prints("sched: no more work\n");
 		sys·exit(0);
 	}
-
 	m->curg = gp;
 	g = gp;
 	gogo(&gp->sched);
 }
 
+void
+gom0init(void)
+{
+	scheduler();
+}
+
+void
+sys·gosched(void)
+{
+	if(gosave(&g->sched))
+		return;
+	g = m->g0;
+	gogo(&m->sched);
+}
+
 //
 // the calling sequence for a routine that
 // needs N bytes stack, A args.