def restart(name, no_block=False, unmask=False, unmask_runtime=False):
    '''
    .. versionchanged:: 2015.8.12,2016.3.3,2016.11.0
        On minions running systemd>=205, `systemd-run(1)`_ is now used to
        isolate commands run by this function from the ``salt-minion`` daemon's
        control group. This is done to avoid a race condition in cases where
        the ``salt-minion`` service is restarted while a service is being
        modified. If desired, usage of `systemd-run(1)`_ can be suppressed by
        setting a :mod:`config option <salt.modules.config.get>` called
        ``systemd.scope``, with a value of ``False`` (no quotes).

    .. _`systemd-run(1)`: https://www.freedesktop.org/software/systemd/man/systemd-run.html

    Restart the specified service with systemd

    no_block : False
        Set to ``True`` to start the service using ``--no-block``.

        .. versionadded:: 2017.7.0

    unmask : False
        Set to ``True`` to remove an indefinite mask before attempting to
        restart the service.

        .. versionadded:: 2017.7.0
            In previous releases, Salt would simply unmask a service before
            restarting. This behavior is no longer the default.

    unmask_runtime : False
        Set to ``True`` to remove a runtime mask before attempting to restart
        the service.

        .. versionadded:: 2017.7.0
            In previous releases, Salt would simply unmask a service before
            restarting. This behavior is no longer the default.

    CLI Example:

    .. code-block:: bash

        salt '*' service.restart <service name>
    '''
    _check_for_unit_changes(name)
    _check_unmask(name, unmask, unmask_runtime)
    ret = __salt__['cmd.run_all'](
        _systemctl_cmd('restart', name, systemd_scope=True, no_block=no_block),
        python_shell=False)

    if ret['retcode'] != 0:
        # Instead of returning a bool, raise an exception so that we can
        # include the error message in the return data. This helps give more
        # information to the user in instances where the service is masked.
        raise CommandExecutionError(_strip_scope(ret['stderr']))
    return True