Jack Coleman (Boole and Babbage) gave this final session of the week, where he discussed the CIRB service in MVS. By creating and scheduling execution of an IRB, you can execute code under someone else's TCB, or in another address space altogether.

He didn't tell me much that I didn't already know. His presentation was a subset of information given by David Peterson at SHARE over a year ago. It was curious that Jack's bibliography didn't mention David's presentation or papers, but perhaps this is because David is a competitor -- he works for Candle Corp. (Say it ain't so, Jack.)

However, I did get some new information after the presentation from James Antognini. Jim is an IBM research type with extensive knowledge of various MVS interfaces. He tells me that it is possible for one IRB to be scheduled in the middle of another. This was bad news to me, because it means that a storage allocator that I had written awhile ago has to be rearchitected.