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am 73a6566d: Merge "Remove expired dns cache entries before removing oldest"

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* commit '73a6566da337db50cfc73c369d774ac1905a30c2':
  Remove expired dns cache entries before removing oldest
This commit is contained in:
Elliott Hughes 2012-05-07 13:59:59 -07:00 committed by Android Git Automerger
commit 53daf4757d
1 changed files with 25 additions and 1 deletions
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26
libc/netbsd/resolv/res_cache.c
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@ -1433,6 +1433,27 @@ _cache_remove_oldest( Cache* cache )
_cache_remove_p(cache, lookup);
}
/* Remove all expired entries from the hash table.
*/
static void _cache_remove_expired(Cache* cache) {
Entry* e;
time_t now = _time_now();
for (e = cache->mru_list.mru_next; e != &cache->mru_list;) {
// Entry is old, remove
if (now >= e->expires) {
Entry** lookup = _cache_lookup_p(cache, e);
if (*lookup == NULL) { /* should not happen */
XLOG("%s: ENTRY NOT IN HTABLE ?", __FUNCTION__);
return;
}
e = e->mru_next;
_cache_remove_p(cache, lookup);
} else {
e = e->mru_next;
}
}
}
ResolvCacheStatus
_resolv_cache_lookup( struct resolv_cache* cache,
@ -1547,7 +1568,10 @@ _resolv_cache_add( struct resolv_cache* cache,
}
if (cache->num_entries >= cache->max_entries) {
_cache_remove_oldest(cache);
_cache_remove_expired(cache);
if (cache->num_entries >= cache->max_entries) {
_cache_remove_oldest(cache);
}
/* need to lookup again */
lookup = _cache_lookup_p(cache, key);
e = *lookup;