cancel threads instead of waiting for join - #31
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currently, whenever an error about the port being in use or being unable to setup the server comes out of
accept_thread(&ainfo);, the server will still merrily go along and let all the threads run indefinitely until I manually ^C it. withpthread_cancelinstead ofpthread_jointhey get canceled and it can actually exit ifaccept_thread(&ainfo);were to return prematurely.