On Mon, 25 Jun 2012 09:25:02 -0400 J R <[email protected]> wrote:

:>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.  

How would that work with a conditional reserve? How can the O/S know if the
reserve can be satisfied unless the reserve I/O is complete?

--
Binyamin Dissen <[email protected]>
http://www.dissensoftware.com

Director, Dissen Software, Bar & Grill - Israel


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