# Class Netplex_mp.mp

    class mp : ?keep_fd_open:bool -> ?terminate_tmo:int -> unit -> Netplex_types.parallelizer

Uses `Unix.fork` to create new threads.

After forking the child process is initialized by calling `Netsys_posix.run_post_fork_handlers`.

By default, all file descriptors are closed that are not explicitly shared with the parent process. This can be wrong for some kind of applications. By setting `keep_fd_open` another behavior can be demanded: The descriptors are kept open except those that need to be closed.

When the controller wants to shut down the process, it notifies the process, and waits `terminate_tmo` seconds until the process terminates. If this timeout expires, the process is killed. Defaults to 60. A negative value disables this function.