A spcptr contains a 5 byte segment and a 3 byte offset. The teraspace pointer is probably a 3 byte segment and a 5 byte offset with a high order bit in the segment portion telling the machine where the segment/offset division is. ( my speculation ). The 16 meg limit to a space is because that is all the 3 byte offset can hold. Converting from teraspace to plain old space ptr. It would be interesting to know if that works ! Steve Richter ----- Original Message ----- From: "Walden H. Leverich" <WaldenL@TechSoftInc.com> To: <email@example.com> Sent: Tuesday, December 18, 2001 10:55 AM Subject: RE: Teraspace memory allocation > Send it along if you would. I'm not sure if 8-byte teraspace pointers have a > correlation to 8 byte addresses in the single-level model which is where OPM > must live. My guess is that the 8-byte address is an offset into the 16-byte > space but I'll take a look. > > -Walden > > ------------ > Walden H Leverich III > President > Tech Software > (516)627-3800 x11 > WaldenL@TechSoftInc.com > http://www.TechSoftInc.com > > > > -----Original Message----- > From: Leif Svalgaard [mailto:firstname.lastname@example.org] > Sent: Tuesday, December 18, 2001 10:44 > To: email@example.com > Subject: Re: Teraspace memory allocation > > > If you can obtain an 8-byte address (I think this is what you call an 8-byte > pointer) it is very easy to convert that into a 16-byte RPG-style (or > MI-style) pointer. I'll send you a program (OPM) to do that it you'll like > to try. > > From: Walden H. Leverich <WaldenL@TechSoftInc.com> > > Nope, and it looks so damn useful. > > I "appear" to be able to allocate memory using the _C_TS_malloc API > > but > then > > I'm screwed. If I declare the "pointers" as pointers in RPG then stuff > > doesn't work because pointers in rpg are 16 bytes, but the teraspace > > stuff wants 8 bytes. If I declare the pointers are 8 byte alpha fields > > I think I get a valid allocation, but I can't tell because I can't use > > the memory because I don't have a pointer to it. I found a PASE API > > that looks to convert a teraspace pointer to a space pointer, but the > > api is very clear that this can only be used in PASE programs. > > > > C/C++ Programmers have it easy because you can change the storage > > model to teraspace and all pointers will become 8-byte teraspace > > pointers. RPG is teraspace "Enabled" but there is no way to change the > > storage model to teraspace. > > > > Teraspace looked incredibly cool for two reasons. 1) Memory > > allocations > 16Meg and 2) Pointers can be byte-aligned. I need >16Meg > > but the byte alignment seemed so cool too. In my application I wanted > > to call a routine that allocated the memory and returned the pointer > > to the caller as a > "magic > > cookie." The caller should never use the contents of the magic cookie > > it should just pass it into other functions in my service program that > > understood how to use it. I can do this with pointers but then I have > > to tell the user of my routines to make sure that the quad-word > > alignment of the pointer is preserved at all times, where > > byte-alignment has no such problems. > > > > > _______________________________________________ > This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list > To post a message email: MIDRANGE-L@midrange.com To subscribe, unsubscribe, > or change list options, > visit: http://lists.midrange.com/cgi-bin/listinfo/midrange-l > or email: MIDRANGE-Lfirstname.lastname@example.org > Before posting, please take a moment to review the archives > at http://archive.midrange.com/midrange-l. > _______________________________________________ > This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list > To post a message email: MIDRANGE-L@midrange.com > To subscribe, unsubscribe, or change list options, > visit: http://lists.midrange.com/cgi-bin/listinfo/midrange-l > or email: MIDRANGE-Lemail@example.com > Before posting, please take a moment to review the archives > at http://archive.midrange.com/midrange-l. > >
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