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How does the system block and relese the resources

 
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venkateshbagayat

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Joined: 04 Mar 2005
Posts: 10

PostPosted: Tue Jun 14, 2005 1:29 pm    Post subject: How does the system block and relese the resources
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Hi All..,
If suppose there are 'n' number of users peforming the same action at the same instance of time, the system allocates the resoursec to one at a time and blocks the resources for others.., consecutively, thus performing the ation at all the terminals. Can anybody plese tell me How does the system do this? I mean., how does the system block and relese the resources in these type of cases?
thanks..,
Venkat
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MGIndaco

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Joined: 10 Mar 2005
Posts: 432
Location: Milan, Italy

PostPosted: Tue Jun 14, 2005 3:15 pm    Post subject:
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In which environment are you working?
Are you using JCL,CICS,DB2,ISPF or...?
And which kind of resources is blocked?
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venkateshbagayat

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PostPosted: Sat Jun 18, 2005 12:01 pm    Post subject: Re: How does the system block and relese the resources
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Hi.,
I am Using JCL, CICS, DB2, ISPF environment. So please can u now tell me how the resourses are blocked and released.., as said above in my first posting.
----Venkat
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mmwife

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Joined: 30 May 2003
Posts: 1592

PostPosted: Sun Jun 19, 2005 9:31 am    Post subject:
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I'm not sure I understand the precise meaning of your ques, but generally ssystem resources are protected from simutaneous use by ENQ/DEQ names for the resource in question.

All requests are Queued on this name when the current user has no further use of the resource he isDEQed and the nat user in the queue is ENQed.

It's a lot more complicated than this (e.g. user dispatching priority is also considered, and I would guess security), but that's the general idea.
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