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1ccb92b888
poll() but there was a race condition where the thread trying to unblock poll() could send the signal before the polling thread had entered poll(). Now using a pipe and polling on that and the client's sockets, and just writing a byte into the pipe to unblock poll. This persists until the next call to poll() so we might force poll() to return once unnecessarily but that's not a problem. This change makes the BSD code similar to the winsock code, which uses a winsock event instead of a pipe.