In article <200309101219.h8ACJ2u04640@mail.Pin.LU>,
Christian Limpach <chris@pin.lu> wrote:
>
>There's still the issue of upcalls happening while the child is still
>running on the parent's stack.  An upcall will save the ucontext on the
>same stack and thus trash it.  Should we just block/hold all upcalls
>between vfork and when execve clears P_PPWAIT?

It seems to me that the vfork semantics should be changed so that upcalls
should not be happening while the child is running on the parent's stack.
Maybe we should introduce a process flag that indicates P_INVFORK, and
have execve clear it. While a process is in P_INVFORK, it cannot execute
upcalls.

christos