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From: rmitchel@bbn.com (Rob Mitchell)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Can I/O Completion routine call 'GetRequest'??
Message-ID: <64025@bbn.BBN.COM>
Date: 3 May 91 19:48:09 GMT
References: <0B010004.nn2ddd@outpost.UUCP> <1991Apr21.224503.12761@engin.umich.edu>
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davids@mondo.engin.umich.edu (David Snearline) writes:

>In article <0B010004.nn2ddd@outpost.UUCP> peirce@outpost.UUCP writes:
>>
>>In article <63618@bbn.BBN.COM>, rmitchel@bbn.com (Rob Mitchell) writes:
>>> [my old stuff]
>> [other old stuff]

>Is it possible to re-use the same parameter block from your completion
>routine?  ie. Has IODone already called Dequeue on your parameter block
>by the time it calls your completion routine?

    I've tried to use the same param block from an I/O completion
    routine, but it bombs out with SCSI dismount errors???  I know
    it sounds strange, but that's what MacsBug "ip" command in
    telling me.

    What I've done is when IO completion is called, I set a flag in
    PB.  Later, during NULL events, I scan message queue for this
    flag and process a request or send a response (depends on 
    AppleTalk code) to finish off whatever the PB was originally
    doing.


Rob Mitchell                            Advanced Simulation Division
Unix & Macintosh Engineer               BBN Systems & Technologies
Internet: rmitchel@vax.bbn.com          33 Moulton Street   MS: 8/C
Primary Dwelling:   617-873-4041        Cambridge, MA  02138
Secondary Dwelling: 617-873-4071
FAX:                617-873-4315

These opinions are mine and mine only.  They do not represent BBNs' opinions.