* comment, clean up scheduler

* rewrite lock implementation to be correct
  (tip: never assume that an algorithm you found
  in a linux man page is correct.)
* delete unneeded void* arg from clone fn
* replace Rendez with Note
* comment mal better
* use 6c -w, fix warnings
* mark all assembly functions 7

R=r
DELTA=828  (338 added, 221 deleted, 269 changed)
OCL=13884
CL=13886

src/runtime/Makefile

@@ -49,10 +49,10 @@ clean:
 	rm -f *.$(O) *.a runtime.acid
 
 %.$O:	%.c
-	$(CC) $<
+	$(CC) -w $<
 
 sys_file.$O:	sys_file.c sys_types.h $(OS_H)
-	$(CC) -D$(GOARCH)_$(GOOS) $<
+	$(CC) -w -D$(GOARCH)_$(GOOS) $<
 
 %.$O:	%.s
 	$(AS) $<

src/runtime/amd64_linux.h

@@ -48,6 +48,6 @@ struct stat {
 
 // Linux-specific system calls
 int64	futex(uint32*, int32, uint32, struct timespec*, uint32*, uint32);
-int64	clone(int32, void*, M*, G*, void(*)(void*), void*);
+int64	clone(int32, void*, M*, G*, void(*)(void));
 int64	select(int32, void*, void*, void*, void*);
 

src/runtime/chan.c

@@ -487,7 +487,7 @@ sys·selectgo(Select *sel)
 	SudoG *sg;
 	G *gp;
 
-	byte *ae, *as;
+	byte *as;
 
 	if(xxx) {
 		prints("selectgo: sel=");
@@ -630,6 +630,8 @@ sys·selectgo(Select *sel)
 asynr:
 asyns:
 	throw("asyn");
+	return;	// compiler doesn't know throw doesn't return
+
 gotr:
 	// recv path to wakeup the sender (sg)
 	if(xxx) {

src/runtime/map.c

@@ -199,7 +199,6 @@ sys·mapassign(Hmap *m, byte *ak, byte *av)
 void
 sys·mapassign1(Hmap *m, ...)
 {
-	Link **ll;
 	byte *ak, *av;
 
 	ak = (byte*)&m + m->ko;

src/runtime/print.c

@@ -8,7 +8,6 @@
 void
 dump(byte *p, int32 n)
 {
-	uint32 v;
 	int32 i;
 
 	for(i=0; i<n; i++) {