2010-04-02 Miguel de Icaza <miguel@novell.com>

2010-04-02  Miguel de Icaza  <miguel@novell.com>

        * SafeHandle.cs: Use refcount == -1 to indicate that the handle
        had been closed.

        The problem here is that we have no records of why the code that
        threw a ObjectDisposedException inside the do { } while block on
        DangerousAddRef was added.   It seems it was added in response to
        Close() methods being called and the need to throw that exception
        on further calls to ObjectDisposedException.

        Sadly, we have no test suites for that.

svn path=/trunk/mcs/; revision=154741