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poongs
Warnings : 1
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Joined: 24 Jan 2007
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Location: pune
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Hi all
I have a doubt in file open..my pgm has a normal input (flat file) and i'm opening tht file in my cobol pgm.i'm handling the error for file open problem also after file opening.But my code is not abending if i try to submit the job after opening the file in edit mode.And also i have given a TIME parameter in my JCL...my job is not abending..but once i come out of the file in edit mode..it is executing fine. |
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expat
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Joined: 14 Mar 2007
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Location: Welsh Wales
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| That's because you have the file in EDIT mode, i.e. DISP=OLD which stops the batch job from allocating the file until you release it by coming out of edit mode. |
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poongs
Warnings : 1
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Joined: 24 Jan 2007
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| Thnx 4 the reply...i tried using DISP=SHR also...and In the Cobol pgm i'm opening in extend mode...but still it is not throwing a n error...and also i wud like to know why the pgm is not abending..since i ahve given a TIME parameter...in the jobcard... |
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agkshirsagar
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Joined: 27 Feb 2007
Posts: 691
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What do you want here, successful execution or abend?
As per my view, you want an abend to happen here..? 
When the resource is not available, your program is not getting control, it will be in wait state. when you release it it will be through.
TIME param will control execution time. if execution time of program exceeds the TIME parameter then program will abend.
Please see that execution time is different from waiting time.. |
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expat
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DISP=SHR on the job means nothing. You have the file held in EDIT which uses DISP=OLD. It only takes one DISP=OLD to stop ANY OTHER DISP from gaining access.
The time parameter as pointed out by agkshirsagar is for the execution time, and if you job is not executing because of dataset contention, it isn't going to use any time, so will not abend. |
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poongs
Warnings : 1
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Joined: 24 Jan 2007
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| Yea...i can understand ur point ...but i want the pgm to abend here...my question is why the pgm is not abending if i open the file in edit mode & try to submit the job? |
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expat
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Because the DISP=OLD used by your online session does not permit the batch job to access the file. It can not access the file until your online session has released the file, and when that happens there is no longer any file contention, so your job reads the file, or whatever.
This is a restriction imposed by the operating system. Perhaps you should try running two batch jobs both using DISP=SHR and see what happens. |
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dick scherrer
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Joined: 23 Nov 2006
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Hello,
Hopefully, this is just an experiment. . . .
If a file might be opened in edit, there should be no batch jobs submitted that would access the dataset. While the operating system will not let the batch job continue, the job will tie up machine resources needlessly. Depenging on the wait time-out set at your location, the job will eventually abend (time our) or be canceled by the operators.
Neither is a proper way to process. |
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poongs
Warnings : 1
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Joined: 24 Jan 2007
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| Thnx everyone for all ur explanations...got some idea on this topic.... |
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dick scherrer
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Joined: 23 Nov 2006
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You're welcome 
Something i neglected to mention previously - the TIME= parameter is for cpu time, not device wait time. |
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expat
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Joined: 14 Mar 2007
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| I suppose it would have 522'd eventually - depending on the site definitions for idle timeout. |
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dick scherrer
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Unless the "edit" session timed out first. . .  |
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expat
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| Quote: |
| I suppose it would have 522'd eventually - depending on the site definitions for idle timeout. |
Aaaaaaaaaaaaaah, my open reply did not specify which would time out first, the job or the TSO session. Covered all eventualities with only one reply  |
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nevilh
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Joined: 01 Sep 2006
Posts: 262
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| Just for information if you edit a dataset in ISPF , ISPF will allocate the dataset with DISP=SHR |
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expat
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nevilh
| Quote: |
| Just for information if you edit a dataset in ISPF , ISPF will allocate the dataset with DISP=SHR |
I sort of remember this from a previous thread we had together, but somehow recall this was for a PDS rather than a PS.
Any clarification welcome. |
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nevilh
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Joined: 01 Sep 2006
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| Clarification not required you are right ..... I should read the posts more carefully |
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girias
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Joined: 09 Feb 2007
Posts: 26
Location: Chennai
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| Hi, how can we set the device wait time limit for a job? |
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expat
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Location: Welsh Wales
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| Unless you are a systems programmer, you can not. |
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