PPC32 and state of the project

[Kevin.Hendricks]

Hi,

> Ok you can start by using
> linuxthreads/sysdeps/powerpc/powerpc64/pt-machine.h as an example to 
> start
> with. Also you need to look at sysdeps/powerpc/powerpc32/[setjmp.S,
> __longjmp.S, /fpu/setjmp.S, /fpu/__longjmp.S]. This is one place (that I
> can think of) where the handling of r2 needs to chance ... :)

Perhaps this is a silly question:

Why not save the thread id register when doing a setjmp/longjmp pair?
It should never change across a setjmp, longjmp pair should it?

The only way it should change is that the setjmp buffer is loaded by one 
thread and the longjmp is taken by another?

Is this allowed?  If so, then you are right and we must remove r2 from 
this list?

I could see setjmp/longjmp being used to create psueudo context switches 
for  multiple user  threads on top of one kernel thread perhaps (this is 
what Sun did with its jdk green_threads implementation) but I do not 
think one would ever move one user thread across different kernel 
threads would they?

Kevin

----
Kevin B. Hendricks
Associate Professor of Operations and Information Technology
Richard Ivey School of Business, University of Western Ontario
London Ontario, CANADA  N6A 3K7
khendricks@ivey.uwo.ca