Article 135081 of comp.os.vms:
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Newsgroups: comp.os.vms
Subject: Re: $CRMPSC on Alpha? How to share a global sect on AXP
Message-ID: <49idh8$iae@post.gsfc.nasa.gov>
From: koehler@bessta.gsfc.nasa.gov (Bob Koehler)
Date: 29 Nov 1995 19:49:59 GMT
Reply-To: koehler@bessta.gsfc.nasa.gov (Bob Koehler)
References: <49h32t$dlh@st-james.comp.vuw.ac.nz>
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In article <49h32t$dlh@st-james.comp.vuw.ac.nz>, mdlcpgs@lhn.gns.cri.nz writes:
>I am really hitting my head on a brick wall porting a vax/vms system
>to Alpha vms when it comes to sharing memory between processes by
>$crmpsc. this works fine on the vax but I get
>"Invalid argument" in the call on the Alpha. I would love to RTFM but
>as usual I am stuck in remote site with borrowed Alpha and no manuals or
>CD. 
>The alternative is obviously a installed common block and after many hoops
>have that working (PSECT_ATTR=command,SHR and SYMBOL_VECTOR=(common=PSECT)
>but really want to avoid the need for privileged install.
>
>Here is the routine(s) that i currently use. In the link, I am setting
>PSECT_ATTR=common,SHR as well. All in vain though. Something to do with
>the page size on Alpha??
>

I haven't read through your code, but your question probably hits it on the
head.  On the Alpha the inadr needs to be page-aligned, both starting at the
first byte on a page and ending on the last byte of a page.

Since the Alpha page size promises to be variable, you should use $getsyi[w]
to request syi$_page_size, which returns as a longword value.

If you page-align to syi$_page_size the same code should work on both
architectures.

And if you follow comp.os.vms you'll come across postings that you can access
the doc set via a WEB browser at http://www.e.kth.se/book.  I believe this is
courtesy Acorn Software.

------------------------------------------------------------------------------
Bob Koehler                     |
koehler@bessta.gsfc.nasa.gov    | rkoehler@author.gsfc.nasa.gov