Checked in fixes to sys_checkpoint() return value

From: Eric Roman (
Date: Tue Sep 17 2002 - 18:24:10 PDT

I fixed the restart (and checkpoint) code so that they return the "correct"
values to user space.  (The return codes were dyslexic before, so RESTORE
was being passed to continuing processes, and CONTINUE was being passed to
restoring processes).  I've tested this out with the pthread hack, and it
looks like things are working sort of ok.  The right number of threads comes
back, and they do (to first order) the right things.

I tested thread creation after a restart.  This is where life gets funny.
It looks like (since we're not yet restoring the process tree) that the
behavior (of my test code) depends on the way the threads were created.
I think that since my threads exit, the signal is going to the wrong
thread...  The end result is that sometimes my test code executes correctly
and sometimes not.  This needs some more time put into it.  It either works
perfectly, repeatedly, or fails repeatedly.  Weird.

All in all, this is mostly good news.  

 - E

Eric Roman                       Future Technologies Group
510-486-6420                     Lawrence Berkeley National Laboratory