Re: Question about inter-thread stack references

glen herrmannsfeldt <gah@ugcs.caltech.edu> wrote:


(snip, I wrote)
> Yes. OS/360 and successors use a doubly-linked list for linkage and
> register saving, and for reentrant routines usually local variables,
> too.


(snip)


> I believe that OS/360 MVT subtasks run in the same protection key
> as the parent. With MVS, ordinary user tasks all run with the same
> protection key, with segment and page tables updated as needed.


(snip)


> [Yes, OS subtasks started with ATTACH all run in the same address
> space. -John]


Well, all of OS/360, OS/VS1 and OS/VS2 runs in one address space.
For OS/360 all real addresses, for OS/VS1 and OS/VS2 a single 16MB
virtual address space. (MVS is where they started using separate
address spaces.)


Much of the OS is key zero, and readable by everyone.


But I think you are agreeing that subtasks run with the same key
as the parent.


-- glen
[Yes. Now back to compilers. -John]

Return to the comp.compilers page.
Search the comp.compilers archives again.