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OSE Processing z/OS JES3 Initialization and Tuning Guide SA32-1003-00 |
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As each data set is selected, a temporary OSE is constructed containing all scheduling requirements. A call is then made to installation exit IATUX19 to allow the system programmer to examine and, if required, to change the information before the OSE is spooled. For SYSOUT destined for a BSC/NJE or SNA/NJE destination, changes to characteristics must be made in IATUX39. When control is returned from the installation exit, if the OSE copy count is nonzero, the OSE is added to the job's OSE spool file. Then, the master OSE (MOSE) pool, which is in main storage, is searched. If an identical master OSE is found, an output scheduling summary (OSS) entry is chained onto that master OSE. If no identical master OSE is found, a new master OSE is created and an OSS is also created, chained to the new MOSE, and added to the pool. After all the above processing for the current job has completed, the queueing function posts the start writer function to determine which jobs are eligible for writer scheduling. The start writer function tries to associate each master OSE of a job with a SAPI application, an external writer, an output device or with an active writer that is waiting for more work. The following rules apply:
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