I've never written code that runs as an SRB, but over the years I've
read about them and seen them in action, such as Omegamon poking code
into other address spaces to grab data or do things like zap memory. So
my simple understanding is an SRB is code that once scheduled, gets run
first when the dispatcher comes back around to that address space, and
then (I assume) is removed once it has done its work.
So what's an IRB - Interrupt Request Block? I've heard the name but
know nothing about it other than the manual mentions Asynchronous Exits,
but doesn't seem to go into the details. So are we talking about code
that gets executed sometime during interrupt processing, such as when an
I/O interrupt occurs?
On 9/15/2023 10:54 PM, Michael Stein wrote:
On Fri, Sep 15, 2023 at 06:16:59PM -0400, Joseph Reichman wrote:
I did schedule the irb in the ikjeft01 TCB against Seymour's advice
for a return code of zero from schedirb
There are likely many ways to do something like what you are trying
to do and the IRB idea likely wasn't close to the best, however:
* if you have a test system at your disposal where a dump or crash
won't hurt others
* and you have the time to do a bit of exploring and learning
I don't see it as bad, unless you don't learn from it.
However the TMP Estae issued an SDUMP
Which is what I'd expect if the code the IRB tried to run had any sort
of problem (program check? abend?). The resulting abend will be passed
to that tasks (IKJEFT01) ESTAE and most likely it has no idea what to
do about it. So it took a dump and likely got the RB chain for that
task cleaned up (or terminated the task?).
I guess it didn't like me scheduling an irb in its TCB
No, my best guess is that IKJEFT01 has no idea anyone would do such
a thing. And if the IRB code ran and terminated normally the IRB would
go away and IKJEFT01 would still be there and would never know.
Go read the dump and figure out what happened...
Find the IJKEFT01 TCB and it's RB chain. Does it show an IRB on the
chain? Where do the PSWs in the RBs on the chain point?
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