On Fri, 18 Jan 2008 20:38:15 -0500, Anne & Lynn Wheeler wrote: > >A.6.3.1 Bypass Post Routine >http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/DZ9ZR003/A.6.3.1?SHELF=DZ9ZBK03&DT=20040504121320&CASE= > >from above: > >The following routine allows the SVC "POST" as used in MVS/ESA to be >bypassed whenever the corresponding WAIT has not yet been executed, >provided that the supervisor WAIT and POST routines use COMPARE AND SWAP >to manipulate event control blocks (ECBs). > This is the Principles of Operation; it is not the Assembler Services manual. Note carefully the "provided that" clause. It's important. Is there any explicit guarantee in the Assembler Services manual that "the supervisor WAIT and POST routines use COMPARE AND SWAP to manipulate [ECBs]", and that the ECBs are updated only after all collateral operations are completed? If not, the programmer who engages in such shenanigans is using unsupported interfaces.
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