search: add comments to tsearch_avl.c

diff --git a/src/search/tsearch_avl.c b/src/search/tsearch_avl.c
index f5c2cf61da99decc3b091ddcbc0bef025ada1116..b56159b9baf05041ba3958cb8bf949602574190f 100644 (file)
--- a/src/search/tsearch_avl.c
+++ b/src/search/tsearch_avl.c
@@ -1,6 +1,12 @@
 #include <stdlib.h>
 #include <search.h>
 
+/*
+avl tree implementation using recursive functions
+the height of an n node tree is less than 1.44*log2(n+2)-1
+(so the max recursion depth in case of a tree with 2^32 nodes is 45)
+*/
+
 struct node {
        const void *key;
        struct node *left;