Hi, I'm not very familiar with the concurrent features of Clojure myself. So I can't really comment on your solution. I tried to solve the problem myself, though. So here is my try: http://paste.pocoo.org/show/115929
My solution to the "prefer reindeers" problem is a global atom *preparing*. While this is true the reindeers have not returned, yet, and the elves are still preparing. As soon as the last reindeer returns Santa's marshall toggles this atom, which has two effects: First Edna stops accepting new elves for signing up to see Santa. However there might be already more elve "packages" in the queue of the Santa agent. So Santa also checks the global atom and ignores any elves in his agent queue until the reindeer comes to pick him up. Is this cheating? This whole process works with one atom and only agents otherwise. Sincerely Meikel
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