Charles,
Let me deal with your two questions
Aren't you conflating DETACH and DELETE?
A programmer who is ATTACHing with ECB the same load module multiple times
should issue one DETACH for every ATTACH, no?
seriatim.
They led me to consult the assembler services reference, and the relevant
language in it is:
<begin extract>
If you code the ECB or ETXR parameter, you must issue a DETACH macro to remove
the subtask from virtual storage before the program that issued the ATTACH
macro terminates. If you do not code the ECB or ETXR parameter, the system
automatically removes the subtask from virtual storage upon completion of the
subtask’s processing.
<end extract>
The answer to your first question is no. An alternative, I think preferable,
design would use LOAD and DELETE explicitly. The OP talks only about ATTACH,
which implicitly brings a copy of the executable, load module or program
object, into storage if a usable one in not already present there (and known to
Contents Supervision).
The answer to your second question is of course yes, and it is something I
should have been more explicit about in my first post.
I try, in responding to questions, to avoid providing too much information, a
quart jar, when the OP only wants a pint pot.
That said, the ECB parameter is the mechanism provided for giving a task
explicit information about and a measure of control over an attached subtask;
and I always use one. Their use is indeed essential when there are precedence
relations among a sequence of subtasks or when an operation is relegated to a
subtask so that it can fail without ABENDing its attacher.
This time, since the question had no context, I answered it minimally and, I
now suspect, inadequately.
John Gilmore Ashland, MA 01721-1817 USA
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