Add TAILQ_FOREACH_SAFE()

git-svn-id: http://www.varnish-cache.org/svn/trunk@275 d4fa192b-c00b-0410-8231-f00ffab90ce4

include/queue.h

@@ -496,6 +496,11 @@ struct {								\
 		(var);							\
 		(var) = ((var)->field.tqe_next))
 
+#define	TAILQ_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = TAILQ_FIRST((head));				\
+	    (var) && ((tvar) = TAILQ_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
 #define	TAILQ_FOREACH_REVERSE(var, head, headname, field)		\
 	for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last));	\
 		(var);							\