ISTR that the "control task" concept was how PL/1 tasking was (at least originally) defined, wasn't it? Haven't written or used any PL/1 for multiple decades now, so my memory bits could be somewhat corrupted.
Peter > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On > Behalf Of john gilmore > Sent: Wednesday, September 07, 2011 3:02 PM > To: IBM-MAIN@bama.ua.edu > Subject: Re: subtask recovery > > Most of the disadvantages of hierarchical subtasking can be avoided by > using a largely hidden control task that ATTACHes other working tasks, > which may sometimes but not often ATTACH their own subtasks. > > Subtasks of an ABENDing [sub]task are ABENDed, but other subtasks of the > control task that do not depend from it are not. The hidden control task > can also be used to simplify communication among its many subtasks. In > deft hands this hybrid scheme can be used to exploit almost all of the > different strengths of both hierarchical and peer-to-peer schemes. -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
