Add 15 bytes to whatever length you are asking for and copy the pointer. 'And' the last nibble to 0. Voila! quad-aligned pointer. :)
In article <CA+AiZz2Zac=k_i_yT4hPEN-GNw5B3NtMi3udvsuhRUO-OsL=z...@mail.gmail.com> you wrote: > Thanks Peter, > fwiw, the buffer pool stuff is combined (not packed) into a structure > obtained with __malloc31(). I'll have to research whether Metal C provides > a way to get Quad-word alignment. > sas > On Tue, Jul 17, 2018 at 12:18 PM, Peter Relson <[email protected]> wrote: > > <snip> > > But who's at fault here... I'm just > > trying to use the service, and the book says nothing about Q-word aligning > > anything. AND, it's been working fine for almost 3 years... have I just > > been lucky that my cell pool getmains were Q-aligned until today? > > </snip> > > > > I'd say that it's our fault for not documenting, but it's a to-do for you. > > > > The AMODE 31 variants require doubleword alignment as they do CDS. > > The AMODE 64 variants requires quadword alignment as they do CDSG > > > > The example in the assembler services guide shows using IARV64 which will > > naturally get storage that accommodates the requirement. > > > > As to have you been lucky? I guess so. You didn't show how you obtained > > the extent area. Depending on size, some flavors of getmain will naturally > > land on a page boundary. But others won't and would then have the default > > of doubleword alignment. > > > > Peter Relson > > z/OS Core Technology Design -- Don Poitras - SAS Development - SAS Institute Inc. - SAS Campus Drive [email protected] (919) 531-5637 Cary, NC 27513 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
