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CICS Deadlock

 
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atulbaviskar

New User


Joined: 08 May 2008
Posts: 6
Location: Mumbai, India

PostPosted: Mon Sep 08, 2008 11:17 am    Post subject: CICS Deadlock
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Hello Frends,

Tran A and Tran B are the two ONLINE transactions and resource are VSAM Files.
Tran A owns Resource 1 for which Tran B is waiting and
Tran B owns Resource 2 for which Tran A is waiting.
So, a deadlock occurs.
I tried to resolve it using Enq/Deq using the following seq in my program
Enq
Read
Update/Rewrite
Deq

But it does not solve my purpose. The other way I tried is to Force kill one of the transaction using FC in CICS environment, but i believe this is temporray solution.
Please suggest.

Thanks,
Atul
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Srinivasa Rao

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Joined: 21 Jun 2005
Posts: 75

PostPosted: Mon Sep 08, 2008 1:56 pm    Post subject:
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Hi Atul,

While defining your transactions use the parameter DTIMOUT. If your transactions are waiting for more than specified time one of the transaction will abend.

If your find out other solution let us know.
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Earl Haigh

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Joined: 25 Jul 2006
Posts: 475

PostPosted: Mon Sep 08, 2008 6:33 pm    Post subject:
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You need to ENQ/DEQ logic in both programs (Tran1 and Tran2) ?
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Robert Sample

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Joined: 06 Jun 2008
Posts: 7935
Location: Bellevue, IA

PostPosted: Mon Sep 08, 2008 6:34 pm    Post subject:
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The classic solution is to ensure both programs access the resources in the same sequence, which prevents deadlocks from occurring.
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