HP OpenVMS Systems

Using SYNCHRONIZE?

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The Question is:

 
I would like to have a command be submitted from within another command file
depending on the status that the print job has completed. Lexical functions may
be the way to go, but I'm confused. SYNCHRONIZE seems only to work with one
BATCH job depending on another BATCH jobs' success and/or failure. Please
reply....thanks in advance....
 

The Answer is :

 
    According to HELP:
 
    SYNCHRONIZE
 
         Holds the process issuing the command until the specified job
         completes execution.
 
         Requires delete (D) access to the specified job.
 
         Format
 
           SYNCHRONIZE  [job-name]
 
 
    The "job" may be a batch or print job. You can therefore determine the
    completion status of a print job as follows:
 
    $ PRINT somefile
    $ SYNCHRONIZE/ENTRY='$ENTRY'	! $ENTRY contains the entry of the
    $					! most recently requested job
    $ status=$STATUS			! Save completion status
    $ IF status				! test completion status
    $ THEN
    $   ! Print job was successful
    $ ELSE
    $   ! Print job failed
    $ ENDIF
 
 
    Note that the above code has a potential race condition. If the print
    job completes very quickly, the SYNCHRONIZE command may return
    "%JBC-E-NOSUCHENT, no such entry" (if it executes after the job has
    completed). A safer command sequence is therefore:
 
    $ PRINT/RETAIN=ALWAYS somefile	! Make sure job is retained
    $ SYNCHRONIZE/ENTRY='$ENTRY'        ! $ENTRY contains the entry of the
    $                                   ! most recently requested job
    $ status=$STATUS                    ! Save completion status
    $ DELETE/ENTRY='$ENTRY'		! Clean up the entry
    $ IF status                         ! Test completion status
    $ THEN
    $   ! Print job was successful
    $ ELSE
    $   ! Print job failed
    $ ENDIF
 
    The SYNCHRONIZE command may be executed as many times as you like after
    the job has completed but before the entry has been deleted. It will
    return the completion status of the job immediately.
 
 

  

     

     
answer written or last revised on ( 13-MAR-2000 )
     
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