From: David Pollak <pollak@...>
Date: 2006-04-26T08:02:14+09:00
Subject: Re: Safe Mode Lowering

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Jake,

Here's code that will do what you want:

module SafeDo
  require 'monitor'

  def safe_do(safe_level)
    ret =3D nil
    waiter =3D ''
    waiter.extend(MonitorMixin)
    wait_cond =3D waiter.new_cond
    is_exception =3D false
    is_done =3D false

    Thread.start do
      begin
        $SAFE =3D safe_level

        ret =3D yield
        is_done =3D true
        waiter.synchronize do
          wait_cond.signal
        end
      rescue Exception =3D> e
        ret =3D e
        is_exception =3D true
        is_done =3D true
        waiter.synchronize do
          wait_cond.signal
        end

      end
    end

    waiter.synchronize do
      wait_cond.wait_while { !is_done }
    end

    raise ret if is_exception

    return ret
  end
end

Thanks,

David


On 4/25/06, Jake McArthur <jake.mcarthur@gmail.com> wrote:
>
> I am aware that the safe mode in Ruby can only be set higher, not
> lower. This makes sense, as unsafe code should not be able to lower
> the safe mode. However, is there a way to lower it at all, as I can
> think of many times this may be useful. Would it not make a lot more
> sense to be able to do something like this?
>
> safe_mode(x) do # x must be greater than the current safe mode
>    # do risky code here
> end
> # back to original safe mode
>
> Maybe the above is possible and I am just missing how, but I would
> think that it would be much more useful to have in a form similar to
> this all the time.
>
> - Jake McArthur
>
>


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