If A and B are marked serially reusable, A sometimes does a LINK to B and B sometimes does a LINK to A then a deadlock is likely.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Paul Gilmartin [0000042bfe9c879d-dmarc-requ...@listserv.ua.edu] Sent: Wednesday, February 15, 2023 6:07 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Are JNI required to be re-entrant and/or re-usable? On Wed, 15 Feb 2023 14:06:15 -0800, Michael Stein wrote: > ... >This used to be documented, see page 26 of GC28-0683-3 OS/VS2 MVS >Supervisor Services and Macro Instructions which says: > > If the module is serially reusable, only one copy is ever placed > in the job pack area; this copy is always used for a LOAD macro > instruction. If the copy is in use, however, and the request is made > using a LINK, AITACH, or XCTL macro instruction, the task requiring the > load module is placed in a wait condition until the copy is available. > >https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Farchive.org%2Fdetails%2Fbitsavers_ibm370OSVS06833OSVS2MVSSupervisorServicesandMacros_11233168&data=05%7C01%7Csmetz3%40gmu.edu%7C00960357700844152f0d08db0fa96a54%7C9e857255df574c47a0c00546460380cb%7C0%7C0%7C638120992528260481%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=cz2ELF%2F6P9dDTalurAwGQSVSV%2Fq5ZNKuSlk7ugbuCCk%3D&reserved=0 > Is there an hazard deadlock if two serially reusable modules are concurrently active and each LINKs to the other? To avoid this, should one be made not reusable? -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
