I *think*
TM MYECB,X'40'
JO NOWAIT
WAIT MYECB
NOWAIT EQU *
is foolproof, with no need for any sort of "interlock."
Charles
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of Jerry Callen
Sent: Thursday, June 02, 2016 6:54 AM
To: [email protected]
Subject: Re: SUSPEND/RESUME is slower than WAIT/POST. PAUSE/RELEASE is slower
than both.
Edward Jaffe wrote:
> And, in the absence of contention, WAIT/POST in
> professionally-developed software becomes orders of magnitude faster
> since everyone knows to skip the WAIT if the post bit is on and to
> attempt a "quick" POST of the ECB (using CS) if the wait bit is off.
I understand the "quick POST" trick w/CS, but bypassing WAIT? I can see how
that would work for something like waiting on I/O completion, but for trading
control back and forth, I think it requires (for example) an auxiliary counter
(and CDS to update both the ECB and the counter simultaneously). Am I missing
something?
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