[PATCH v1 1/9] perf util: Create rblist__reset() function

[Jin Yao]

Currently we have a rblist__delete() which is used to delete a rblist.
While rblist__delete() will free the pointer of rblist at the end.

It's inconvenience for user to delete a rblist which is not allocated
by something like malloc(). For example, the rblist is defined in a
data structure.

This patch creates a new function rblist__reset() which function is
similar as rblist__delete() but it will not free the rblist.

Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
---
 tools/perf/util/rblist.c | 24 +++++++++++++++++-------
 tools/perf/util/rblist.h |  1 +
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/rblist.c b/tools/perf/util/rblist.c
index 0dfe27d..eafa663 100644
--- a/tools/perf/util/rblist.c
+++ b/tools/perf/util/rblist.c
@@ -101,20 +101,30 @@ void rblist__init(struct rblist *rblist)
 	return;
 }
 
+static void remove_nodes(struct rblist *rblist)
+{
+	struct rb_node *pos, *next = rb_first(&rblist->entries);
+
+	while (next) {
+		pos = next;
+		next = rb_next(pos);
+		rblist__remove_node(rblist, pos);
+	}
+}
+
 void rblist__delete(struct rblist *rblist)
 {
 	if (rblist != NULL) {
-		struct rb_node *pos, *next = rb_first(&rblist->entries);
-
-		while (next) {
-			pos = next;
-			next = rb_next(pos);
-			rblist__remove_node(rblist, pos);
-		}
+		remove_nodes(rblist);
 		free(rblist);
 	}
 }
 
+void rblist__reset(struct rblist *rblist)
+{
+	remove_nodes(rblist);
+}
+
 struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx)
 {
 	struct rb_node *node;
diff --git a/tools/perf/util/rblist.h b/tools/perf/util/rblist.h
index 4c8638a..048c285 100644
--- a/tools/perf/util/rblist.h
+++ b/tools/perf/util/rblist.h
@@ -35,6 +35,7 @@ void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node);
 struct rb_node *rblist__find(struct rblist *rblist, const void *entry);
 struct rb_node *rblist__findnew(struct rblist *rblist, const void *entry);
 struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx);
+void rblist__reset(struct rblist *rblist);
 
 static inline bool rblist__empty(const struct rblist *rblist)
 {
-- 
2.7.4