In <[email protected]>, on 06/25/2012
at 09:25 AM, J R <[email protected]> said:
>The RESERVE macro did (still does?) not directly do the hardware
>reserve. Rather, it set a bit in the UCB to tell the next IO to the
>unit to prepend a reserve CCW to the channel program.
That was the original design, but these days there's an option to
issue an I/O with a reserve CCW at the time that the ENQ SVC issued by
the RESERVE macro obtains the resource. I don't recall what release
added the option.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
Atid/2 <http://patriot.net/~shmuel>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
