In <b0c6f15b0911180948m22a96c1fh9f10e696c00cb...@mail.gmail.com>, on
11/18/2009
at 11:48 AM, Chris Craddock <crashlu...@gmail.com> said:
>Despite what the books say, reentrant programs have NEVER been placed in
>protected storage UNLESS they were loaded from an APF authorized
>library.
The system was loading code marked with RENT into SP252 key 0 before there
was such a thing as APF.
>But since APF programs all start in PSW key 8
Not if the PPT assigns a key or if they are running V=R[1].
>It has ALWAYS been this way.
It used to be that the distinction was system[2] library versus user
library.
>When you link a program "RENT" you're telling
>the system that the program does not modify itself.
No, you're telling the system to allow concurrent execution of a single
copy. REFR was almost a read-only flag, and in current software it is more
of one.
[1] Moment of silence.
[2] E.g., SYS1.LINKLIB from the system linklist DCB.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see <http://patriot.net/~shmuel/resume/brief.html>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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