fiber/new

    cfunction

    (fiber/new func &opt sigmask)

    Create a new fiber with function body func. Can optionally take a set
    of signals to block from the current parent fiber when called. The
    mask is specified as a keyword where each character is used to
    indicate a signal to block. If the ev module is enabled, and this
    fiber is used as an argument to `ev/go`, these "blocked" signals will
    result in messages being sent to the supervisor channel. The default
    sigmask is :y. For example,

        (fiber/new myfun :e123)

    blocks error signals and user signals 1, 2 and 3. The signals are as
    follows:

    * :a - block all signals

    * :d - block debug signals

    * :e - block error signals

    * :t - block termination signals: error + user[0-4]

    * :u - block user signals

    * :y - block yield signals

    * :0-9 - block a specific user signal

    The sigmask argument also can take environment flags. If any mutually
    exclusive flags are present, the last flag takes precedence.

    * :i - inherit the environment from the current fiber

    * :p - the environment table's prototype is the current environment
      table