Radoslaw wrote:

>Paul Gilmartin pisze:
>
>> Did anyone notice?:
>>
>> o Global Resource Serialization support designed to allow programs to
>>    synchronously change an exclusive enqueue to a shared enqueue to help
>>    reduce contention, in addition to existing support for changing an
>>    enqueue from shared to exclusive
>
>I noticed, however the point is in application. Program is allowed to do 
>that, but IMHO no one is doing that nowadays. So we must wait for 
>appliction support.

Not necessarily.  It seems that the initiator will use it.

"Corresponding support is planned in JCL for a new JOB statement keyword 
to allow you to specify that access to data sets can transition from 
exclusive to shared after the last step in which they are allocated with a 
disposition of OLD, NEW, or MOD."

-- 
Tom Marchant

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