minor, clarify usage of ase_ffsl in skiplist.c

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>

diff --git a/src/skiplist.c b/src/skiplist.c
index 65f43c1..d073287 100644 (file)
--- a/src/skiplist.c
+++ b/src/skiplist.c
@@ -561,8 +561,10 @@ _put_skiplist(skiplist_t sl, skiplist_level_t *path, size_t psz,
              hcode_t h, Lisp_Object key, Lisp_Object value)
 {
        /* entirely new data, build a node for it */
-       /* determine the number of levels to add */
-       size_t nlevels = __ase_ffsl(random()), cnt;
+       /* determine the number of levels to add, this is a log distribution
+        * so we use ffs(3) of a random number */
+       size_t nlevels = __ase_ffsl(random());
+       size_t cnt;
        skiplist_level_t levels, last = path[psz--];
        skiplist_node_t node;