thread/new

    cfunction

    (thread/new func &opt capacity flags)

    Start a new thread that will start immediately. If capacity is 
    provided, that is how many messages can be stored in the thread's 
    mailbox before blocking senders. The capacity must be between 1 and 
    65535 inclusive, and defaults to 10. Can optionally provide flags 
    to the new thread - supported flags are:

    * :h - Start a heavyweight thread. This loads the core environment 
      by default, so may use more memory initially. Messages may 
      compress better, though.

    * :a - Allow sending over registered abstract types to the new 
      thread

    * :c - Send over cfunction information to the new thread.

    Returns a handle to the new thread.