Thu Nov 22 03:30:57 2001  Tim Janik  <timj@gtk.org>

        * gvalue.h (G_TYPE_IS_VALUE): use g_type_check_is_value_type()
        instead of g_type_value_table_peek().

        * gtype.[hc] (type_check_is_value_type_U): speed up check
        LOCK-less by caching lookups in node->mutatable_has_value_table.

        * gtype.[hc]: removed locks where possible. partly based on
        patches from owen and alex.