Just a quick thought (and before I've had my coffee no less!), but I think what I'd do is replace the boolean *end-search* with a *search-state* var that could be either :idle, :running or :stopping. Then in search-stops, just set *search-state* to :stopping -- you don't need to actually wait for the agents to finish, you just need to know that the current condition is "waiting for the search to end" so you don't quit the app or start a new search until the cleanup is finished. Then when you do hit some task that needs to wait until the agents are done, you can go ahead and await the agents (i.e. if you're quitting and it doesn't matter if there's a hang), or spawn a thread that will await the agents before starting the new search. You could also run a cleanup thread that would check the state of your search agents and set the *search-state* from :stopping back to :idle once all the search agents had finished.
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