google/lisp-koans — pull request #28 by ralph-moeritz (2013-06-24 08:39:30+00:00)
Title: Use bordeaux-threads in the threads koan for portability

The bordeaux-threads API is largely compatible with sb-thread, so very little had to be changed besides the package prefix. Since BT doesn't include semaphores, we use bt-semaphore for this, which provides a semaphore class that is with an API compatible with sb-thread.