From - Thu Sep 25 07:51:41 1997
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From: rankin@eql.caltech.edu (Pat Rankin)
Newsgroups: comp.os.vms
Subject: Re: *Opposite problem now...  Was: [any help on sys$qiow(...)? ]
Date: 24 Sep 1997 13:50 PST
Organization: California Institute of Technology
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Message-ID: <24SEP199713503298@eql.caltech.edu>
References: <01BCC875.9721B9F0.rockwell@umkc.edu> <34291B67.3D6FFDA4@star.zko.dec.youknowwhere>
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In article <34291B67.3D6FFDA4@star.zko.dec.youknowwhere>,\
 Andy Goldstein <Goldstein@star.zko.dec.youknowwhere> writes...
[...]
: Let's go back to basics here... I missed your original posts but I
: gather the issue is having a completion AST for the file I/O with a
: parameter of your choice. In fact, the RMS success and failure routine
: arguments can get you close enough for practical purposes. These get
: called on service completion as AST routines. The AST parameter is
: either the FAB or RAB, dependingon which control block was originally
: passed to the service.
: 
: Turning a FAB or RAB address into your own parameter is straightforward:
: simply embed the structure in a larger structure of your own, prefixing
: or appending your own fields. It is then easy to compute the base of
: your own structure from the FAB or RAB address.
[...]

     It's even easier than that.  Both of those RMS structures
contain a "user context" field.  You can pass the same thing as
a 32-bit AST argument just by putting it into that field.

                Pat Rankin, rankin@eql.caltech.edu