On Thu, 30 May 2002, Peter Wemm wrote:

> Julian Elischer wrote:
> > On Thu, 30 May 2002, Jake Burkholder wrote:
> [..]
> > > It is much more difficult to ensure that all the register values
> > > end up the same on each return from the system call on sparc64, due
> > > to the way that register stack works.  The current test program
> > > will not work at all, because setjmp, longjmp cannot be used to
> > > switch the stack in the same way.
> > 
> > The library will not be using setjmp and longjmp in this way but 
> > instead the setcontext() call that dan wrote for the current thread
> > library. If that works it should be enough.
> > (I'd like to investigate your comments though... can you explain
> > more about why it's a problem? It sure simplifies things on most
> > architectures I've done this on..
> setjmp/longjmp cannot be used to switch stacks on ia64 either, for what
> it's worth.  This is why libc_r is disabled for ia64 (and I presume
> sparc64).

I don't really care if setjmp doesn't work, as long as there is
some assembler that can be put in the library that
can switch a stack/thread.

> Cheers,
> -Peter
> --
> "All of this is for nothing if we don't go to the stars" - JMS/B5

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