Rewrite X11 snarf. Maybe this will be better.

kern/devdraw.c

@@ -183,6 +183,24 @@ static	char Eoldname[] =	"named image no longer valid";
 static	char Enamed[] = 	"image already has name";
 static	char Ewrongname[] = 	"wrong name for image";
 
+int
+drawcanqlock(void)
+{
+	return canqlock(&sdraw.lk);
+}
+
+void
+drawqlock(void)
+{
+	qlock(&sdraw.lk);
+}
+
+void
+drawqunlock(void)
+{
+	qunlock(&sdraw.lk);
+}
+
 static int
 drawgen(Chan *c, char *name, Dirtab *dt, int ndt, int s, Dir *dp)
 {

kern/fns.h

@@ -79,6 +79,9 @@ Walkqid*	devwalk(Chan*, Chan*, char**, int, Dirtab*, int, Devgen*);
 int		devwstat(Chan*, uchar*, int);
 void		drawactive(int);
 void		drawcmap(void);
+int		drawcanqlock(void);
+void		drawqlock(void);
+void		drawqunlock(void);
 void		dumpaproc(Proc*);
 void		dumpqueues(void);
 void		dumpregs(Ureg*);