Page cache not clearing on node save

Do you have a minimum cache lifetime set?

I also had this problem.
When using memcache as cache backend it worked fine - when I saved a node, the page cache was cleared and new version appeared for the anonymous user.
However when changing to apc in settings.php this was no longer happening - the old page was still being served.

drupal_apc_cache.inc:

function clear($cid = NULL, $wildcard = FALSE) {

When $cid is NULL, the function actually does not clear anything.
But according to cache_clear_all() doc:

"$cid: If set, the cache ID or an array of cache IDs. Otherwise, all cache entries that can expire are deleted. "

I'm not that familiar with all this, therefore i am in doubt about 'that can expire' part..
When saving a node, cache_clear_all() is called for cache_block and cache_page bins with $cid=NULL.

However by adding this line to clear(), the page cache is now cleared on node save.:

if ($cid==NULL) $this->flush();

Is this the correct way to handle this?

#2 attached as a patch file.

Committed to dev.