No. Independent track group is a special case. Spin is synonymous with "start processing now" and does not imply that the space will be reclaimed before the entire job is processed.
If your DD has SPIN=CLOSE or you dynamically alloowcate with DALSPIN, then you get an independent track group whether or not you have FREE=CLOSE. If you dynamically unallocate the SYSOUT data set, then subsequent processing is the same as if you had specified FREE=CLOSE. The difference is just in programming convenience. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [[email protected]] on behalf of Charles Mills [[email protected]] Sent: Sunday, May 17, 2020 4:08 PM To: [email protected] Subject: Re: Looking for clarification/guidance on SMTP DD FREE/SPIN So "spin" is more or less synonymous with "independent track group," at least for spin on allocation (DD or SVC99) as opposed to after allocation such as with SETPRT or on unallocation? Or re-phrasing the question, if I allocate with SPIN=UNALLOC and FREE on CLOSE, and do CLOSE the dataset, then I will not "consume" spool tracks endlessly (assuming a writer picks up the dataset and processes it). Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Seymour J Metz Sent: Sunday, May 17, 2020 12:34 PM To: [email protected] Subject: Re: Looking for clarification/guidance on SMTP DD FREE/SPIN > How does one "issue" SPIN=UNALLOC? With a DD statement in the JCL. That's part of why I find the text confusing. > What is a "spin SYSOUT data set" other than one with the SPIN keyword or text unit? A spin dataset is a SYSOUT dataset that can be processed before the job terminates. You can specify it in the JCL, in the dynamic allocation or in the DYNAMIC unallocation. You can also spin an open SYSOUT dataset with SETPRT. > Documentation semantics aside You can't get correct output if you set the semantics aside. > How do I allocate an independent track group? DALSPIN (X'8013') ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
