On Tue, 22 May 2007 13:17:16 -0500, Scott Fagen wrote:
>>>
>>> ... If the ENQ is exclusive for the first step and
>>>shared for the second, it will be changed by the initiator/terminator
>>>between steps.
>>>
>>Nope.
>>
>>Wishful thinking.
>>
>>But why not?
>
>ENQ RET=CHNG only supports 'upgrade' from SHR to EXC, not 'downgrade' from
>EXC to SHR. ...
>
That answers nothing; it's the impatient parent telling the curious
child, "Because!" The question remains, "But why not?"
See Robert Rosenberg's recent well-reasoned contribution on this
topic:
Linkname: Re: Why is there JOB scope for DSN ENQ's anyway?
URL: http://bama.ua.edu/cgi-bin/wa?A2=ind0705&L=ibm-main&P=195906
-- gil
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