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A couple more questions (please see code below): ;; is this a correct way for this? (defun test() ;; Is the general pattern to use a defun? Couldn't you use the lambda body in the thunk in make-thread just as well? (bt:with-lock-held (lock) (do-stuff) (do-more-stuff) (bt:condition-wait cv lock))) ;...

What you show seems to be coming from the macro expansion of DO* rather than DO.

The end-test-form of your DO* is most probably at the wrong nesting level, just add a pair of parentheses ( ) around it.