Add rotate functionality to ql module

2020-04-02 11:11:08 -07:00
parent 0dc95a882f
commit 1dd24ca6d2
2 changed files with 34 additions and 1 deletions
--- a/include/jemalloc/internal/ql.h
+++ b/include/jemalloc/internal/ql.h
@@ -98,6 +98,16 @@ struct {								\
 	ql_first(a_head_b) = (a_elm);					\
 } while (0)

+/*
+ * An optimized version of:
+ *	a_type *t = ql_first(a_head);
+ *	ql_remove((a_head), t, a_field);
+ *	ql_tail_insert((a_head), t, a_field);
+ */
+#define ql_rotate(a_head, a_field) do {					\
+	ql_first(a_head) = qr_next(ql_first(a_head), a_field);		\
+} while (0)
+
 #define ql_foreach(a_var, a_head, a_field)				\
 	qr_foreach((a_var), ql_first(a_head), a_field)