implement mutex control from shared memory... plain memory not

done yet... wonder if we should even do/include it?

Also looking at cleaning up the struct... do we really need
the sharedslotdesc element??


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@729921 13f79535-47bb-0310-9956-ffa450edef68