Add comment in update_source.

fb3cba7d · Juliusz Chroboczek · 4933f230 · fb3cba7d
Commit fb3cba7d authored Nov 25, 2011 by Juliusz Chroboczek
Hide whitespace changes
Inline Side-by-side

Showing with 4 additions and 0 deletions

source.c source.c +4 -0

No files found.
--- a/source.c
+++ b/source.c
@@ -116,6 +116,10 @@ update_source(struct source *src,
    if(metric >= INFINITY)
        return;
+    /* If a source is expired, pretend that it doesn't exist and update
+       it unconditionally.  This makes ensures that old data will
+       eventually be overridden, and prevents us from getting stuck if
+       a router loses its sequence number. */
    if(src->time < now.tv_sec - SOURCE_GC_TIME ||
       seqno_compare(src->seqno, seqno) < 0 ||
       (src->seqno == seqno && src->metric > metric)) {