On Mon, 23 Oct 2006 10:34:46 +0200 Bernd Oppolzer <[EMAIL PROTECTED]> wrote:
:>The RENT attribute is not ignored for unauthorized programs. The program is :>still treated as reentrant (no new LOAD; no wait for completion of other :>processes), only the write protection is not set. :>Now consider the following: :>We have modules that try to improve performance by doing complex computations :>only once. :>The modules are RENT, because they are used in a dialog environment. :>This is usually implemented by having a static pointer which is initialized :>with zero. The first time the module is called the static pointer is :>inspected. If still zero, the computation has to be done and in the end :>the static pointer is changed to the location of the result (usually a table :>of results, depending on the various inputs). :>We call this a "Gedaechtnis" (german for memory). :>The worst thing that could happen if the module is called in parallel is :>that the computation is done multiple times. If the module has completed the :>computation, it checks again the pointer, and if now not zero, it throws away :>its results, because another process has already completed the computation. :>For a logic of this kind, I need RENT programs which can be changed. Or you can use name/token to anchor the result area. -- Binyamin Dissen <[EMAIL PROTECTED]> http://www.dissensoftware.com Director, Dissen Software, Bar & Grill - Israel Should you use the mailblocks package and expect a response from me, you should preauthorize the dissensoftware.com domain. I very rarely bother responding to challenge/response systems, especially those from irresponsible companies. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
