better fixes. 
never call exits in a threaded program.


Reference: /n/sources/patch/applied/venti3
Date: Fri Nov 30 00:57:45 CET 2007
Signed-off-by: rsc@swtch.com

--- /sys/src/cmd/venti/srv/icachewrite.c	Fri Nov 30 00:57:27 2007
+++ /sys/src/cmd/venti/srv/icachewrite.c	Fri Nov 30 00:57:27 2007
@@ -251,8 +251,6 @@
 		as = icachestate();
 		if(as.arena==iwrite.as.arena && as.aa==iwrite.as.aa){
 			/* will not be able to do anything more than last flush - kick disk */
-			if(0)
-				fprint(2, "icache: nothing to do - kick dcache\n");
 			trace(TraceProc, "icachewritecoord kick dcache");
 			kickdcache();
 			trace(TraceProc, "icachewritecoord kicked dcache");
--- /sys/src/cmd/venti/srv/venti.c	Fri Nov 30 00:57:27 2007
+++ /sys/src/cmd/venti/srv/venti.c	Fri Nov 30 00:57:27 2007
@@ -186,7 +186,8 @@
 		ventiserver(nil);
 	else
 		vtproc(ventiserver, nil);
-	exits(0);
+	
+	threadexits(nil);
 }
 
 static void