# Copyright 1999-2013 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

import gc


def clear_caches(trees):
    for d in trees.values():
        d["porttree"].dbapi.melt()
        d["porttree"].dbapi._aux_cache.clear()
        d["bintree"].dbapi._clear_cache()
        if d["vartree"].dbapi._linkmap is None:
            # preserve-libs is entirely disabled
            pass
        else:
            d["vartree"].dbapi._linkmap._clear_cache()
    gc.collect()