A Factor instance runs in a single thread. Blocking operations are done either using non blocking sockets or similar async i/o methods. Task switching occurs on i/o wait or explicit yielding. APIs like ZeroMQ must be wrapped in Factor such that they use the non-block functionality of that API. In the case of ZeroMQ you would use the functionality that allows getting a file handle you can use select/epoll on. You would use this in factor to suspend the factor thread until activity on the file handle occurs at which point the thread would wake up and continue.
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