ObUnclean Does Unix System Services implement its own spin locks or does it use MVS services? Does any *ix have spin locks outside of the kernel?
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of David Crayford <dcrayf...@gmail.com> Sent: Friday, October 18, 2019 1:42 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Best way for a task to give up the CPU and let other tasks run? Typically, OS services like these and it's Unix equivalent sched_yield() are used in spinlocks. On 2019-10-18 1:20 AM, Mike Hochee wrote: > Yes exactly, that is part of what WLM is designed to do. In the real world > most shops use WLM service classes and velocity goals to control things like > CPU dispatching frequency. I'm sure there exist workloads which tend to defy > the controls available in WLM, but I suspect they are quite rare. In all but > those rare instances, I'd be inclined to steer clear coding something in a > program for the purpose of getting it re-dispatched for some resource. > > My nickels' worth. > Mike > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Seymour J Metz > Sent: Thursday, October 17, 2019 12:57 PM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: Best way for a task to give up the CPU and let other tasks run? > > Caution! This message was sent from outside your organization. > > Why? If you are waiting for something then you should use system services, > e.g., ENQ, WAIT, to delay until it occurs; if you are not waiting for > something then why not let the WLM handle what it's designed to handle? > > > -- > Shmuel (Seymour J.) Metz > http://mason.gmu.edu/~smetz3 > > > ________________________________________ > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of > Thomas David Rivers <riv...@dignus.com> > Sent: Thursday, October 17, 2019 8:54 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Best way for a task to give up the CPU and let other tasks run? > > Does anyone happen to know the best way for a running task to give up running > and let another task run? > > But - this isn't "give up" as in ending the task, just giving up the CPU to > allow another task to run and then returning to this task. > > Sorta like "I'm done for the moment if something else would like to run". > > - Thanks - > - Dave R. - > > -- > riv...@dignus.com Work: (919) 676-0847 > Get your mainframe programming tools at > http://secure-web.cisco.com/1aWH_FeYH8IlEwirJURk9sI7agw2X83FuMWKAE73bQgFjnWwW8-ePX_1xe1c0wvYZd8fcSnekzTSoxHccH5VLqo1rFCH9l3YX-k05mc9h6Ase64ekfUJQccKN7CoeKCb4mPWA65v0tvTLbXvBj_NDoce9MeFrZe7fZoePl7rSLNfSTkWiZtNoKrgNjJAaR56QKA_GzYAnQG1J3QqwTGR2aaONvJRqOZStLx-dDHLw-ANzfr-JqBhHVtxkPlrsOeTXQ5nr8kcqRcEdVKERvT0cBrDKRHbq59tsrJEPtz1qMjVK741J5WNN9JBdkVQ8CVHDOJsDhzqP_OSlWPU3JX2BtgFEtR-6t6ZDm5b1JEGSDbqulEaUL7WgUU6iBjImRoscWih5c4GWGVq3XTLgBcJli_t27401y41mmE7SVQ5PT5JfB_KovcV3dinUMhketMyr/http%3A%2F%2Fwww.dignus.com > > ---------------------------------------------------------------------- > 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 > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
