list: add vlist_clear()

include/villas/list.h

@@ -85,6 +85,9 @@ int vlist_destroy(struct vlist *l, dtor_cb_t dtor = nullptr, bool free = false)
 /** Append an element to the end of the list */
 void vlist_push(struct vlist *l, void *p);
 
+/** Clear list */
+void vlist_clear(struct vlist *l);
+
 /** Remove all occurences of a list item */
 void vlist_remove_all(struct vlist *l, void *p);
 

lib/list.cpp

@@ -96,6 +96,15 @@ void vlist_push(struct vlist *l, void *p)
 	pthread_mutex_unlock(&l->lock);
 }
 
+void vlist_clear(struct vlist *l)
+{
+	pthread_mutex_lock(&l->lock);
+
+	l->length = 0;
+	
+	pthread_mutex_unlock(&l->lock);
+}
+
 int vlist_remove(struct vlist *l, size_t idx)
 {
 	pthread_mutex_lock(&l->lock);