[bknr-devel] Recursive locks problem on sbcl

Hi Hans, the problem we've spoken of yesterday on irc (recursive lock attempt warning on sbcl using bknr datastore) proved to be trivial to solve - there is a primitive in sb-thread for exactly this case. I have not tested it extensively yet, but it appears to work. The patch is attached.

FWIW, being unable to load some third-party libraries supplied with bknr (mainly cxml and unit-test), I ditched thirdparty altogether, installed all the newest versions of whatever bknr-indices and bknr-datastore depend on, and both seem to work.

Thanks, Denis (oudeis).