IIRC, DELETE does not really DELETE the module, if the use count (which
is in some of
the control blocks) is not zero. The use count is incremented on every
LOAD, which refers
to the load module and decremented on every DELETE.
If there are more copies of the same module (in the NORENT case), there
must be
multiple control blocks, too (IMO), so that every copy has its own use count
(which is always 1, I guess).
Maybe I am mixing up the use count with another count, called
responsibility count;
there are two of them, IIRC.
One of them records the LOAD / DELETE sequences, and the other, AFAIK,
records the LINK / XCTL / ATTACH uses. It is important to know that normal
CALL does not change this count, because the op sys does not know about
CALLs to modules (using machine instructions).
It would be nice if someone who knows better could correct me on the
details.
Thanks, have a nice Sunday
Bernd
Am 14.08.2021 um 17:45 schrieb Paul Gilmartin:
On Sat, 14 Aug 2021 08:39:02 -0400, Peter Relson wrote:
... [for NORRENT} every time the system is asked to load the module, even if
there
is already a usable copy in storage, another copy is fetched. ...
And it is possible that there could be procedural dependencies on there
being a single copy..
If the programmer issues DELETE, which copy is deleted?
-- gil
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