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David Rose 2001-03-14 20:26:54 +00:00
parent f0464f40ac
commit e5a5921622
1 changed files with 19 additions and 0 deletions
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19
panda/src/graph/wrt.I
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@ -779,6 +779,25 @@ cached_wrt_subtree(NodeRelation *arc, Node *to, UpdateSeq as_of, UpdateSeq now,
result.write(wrt_cat.spam(false), 2);
}
#endif
if (to->get_num_parents(graph_type) != 1) {
// Oops! We *don't* have exactly one parent. This means our
// cache is stale in some surprising way. To recover, we'll
// force a recompute of the cache by asking for the wrt() from
// the very latest timestamp.
// This, of course, assumes we haven't just asked for the wrt()
// from the very latest timestamp.
#ifndef NDEBUG
if (wrt_cat.is_info()) {
wrt_cat.info()
<< "Recovering from stale cache.\n";
}
#endif
nassertr(as_of != UpdateSeq::fresh(), NULL);
return cached_wrt_subtree(arc, to, UpdateSeq::fresh(),
UpdateSeq::fresh(), result, graph_type);
}
nassertr(to->get_num_parents(graph_type) == 1, NULL);
NodeRelation *to_arc = to->get_parent(graph_type, 0);