[Info-vax] Orphaned processes on OpenVMS

[Wendell]

On May 20, 10:07 am, moro... at world.std.spaamtrap.com (Michael Moroney)
wrote:
> Johnny Billquist <b... at softjar.se> writes:
> >On 2011-05-19 16.47, Snowshoe wrote:
> >> On 5/19/2011 6:10 PM, Johnny Billquist wrote:
> >>> On 2011-05-19 14.53, Wendell wrote:
> ...
> >>>> I've heard it said that OpenVMS doesn't have this problem at all. How
> >>>> does it prevent orphans or at least allow cleanup without rebooting?
>
> Yes the process hierarchy is quite different.  Unix has a single tree
> while VMS has many parallel trees, most of which consist of a single
> (detached) process.  The difference is, and this is what the original
> poster was asking about, if a VMS process has subprocesses, the
> subprocesses will be stopped unconditionally when the main processes
> is stopped. The process is recursive; if the subprocesses have lower
> subprocesses, they will be stopped first.  In Unix, they are not stopped,
> but they become owned by the process above it or become orphan
> processes.

The VMS way sounds much more sensible. As I remember, VMS actually
came after Unix. Anyone know if the design of the VMS process
hierarchy was a deliberate reaction to issues with Unix?