Version 1.1 of ai12s/ai12-0183-1.txt

Unformatted version of ai12s/ai12-0183-1.txt version 1.1
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!standard D.4(4)          16-03-23 AI12-0183-1/01
!standard D.4(7/5)
!class presentation 16-03-23
!status Amendment 1-2012 16-03-23
!status work item 16-03-23
!status received 16-03-23
!priority Low
!difficulty Easy
!qualifier Omission
!subject Presentation errors in Ada 2012 post Corrigendum 1
!summary
This AI corrects minor errors in the Standard.
1) Add Ordered_FIFO_Queuing to D.4(4).
2) Be specific about which policy is defined in 9.5.3 and 9.7.1.
!question
1) AI12-0163-1 defines policy Ordered_FIFO_Queuing. But the Legality Rule D.4(4) does not allow that as a policy name. Should it? (Yes.)
2) D.5(7/2) says "The rules for this policy are specified in 9.5.3 and 9.7.1." This paragraph defines three queuing policies. "This" in this text refers to that last one mentioned (I think), but that's ambiguious. Should we be specific here? (Yes.)
!recommendation
(See Summary.)
!wording
[Editor's note: The following changes are included in the draft RM, even though it is not intended for the full ARG to take up this AI until just before the next document (an Amendment?) is submitted to WG 9. This AI is only used to record wording changes that appear to the editor to be obvious improvements in the Standard.]
1) Modify D.4(4):
The policy_identifier shall be either FIFO_Queuing, {Ordered_FIFO_Queuing, }Priority_Queuing or an implementation-defined identifier.
2) Modify D.5(7/2) [as modified by AI12-0163]:
Three queuing policies, FIFO_Queuing, Ordered_FIFO_Queuing, and Priority_Queuing, are language defined. If no Queuing_Policy pragma applies to any of the program units comprising the partition, the queuing policy for that partition is FIFO_Queuing. The rules for {the FIFO_Queuing}[this] policy are specified in 9.5.3 and 9.7.1.
!discussion
1) This is a clear omission from AI12-0163-1. Obviously, if we define a queuing policy, we have to allow it to be used in the Queuing_Policy pragma, else it would be the most useless Ada construct ever.
2) The other two queuing policies are defined in this subclause, so it's fairly obvious that "this" must refer to FIFO_Queuing. But it shouldn't be necessary to read the entire subclause in order to figure that out.
!corrigendum D.4(4)
Replace the paragraph:
The policy_identifier shall be either FIFO_Queuing, Priority_Queuing or an implementation-defined identifier.
by:
The policy_identifier shall be either FIFO_Queuing, Ordered_FIFO_Queuing, Priority_Queuing or an implementation-defined identifier.
!corrigendum D.4(7/5)
Replace the paragraph:
Three queuing policies, FIFO_Queuing, Ordered_FIFO_Queuing, and Priority_Queuing, are language defined. If no Queuing_Policy pragma applies to any of the program units comprising the partition, the queuing policy for that partition is FIFO_Queuing. The rules for this policy are specified in 9.5.3 and 9.7.1.
by:
Three queuing policies, FIFO_Queuing, Ordered_FIFO_Queuing, and Priority_Queuing, are language defined. If no Queuing_Policy pragma applies to any of the program units comprising the partition, the queuing policy for that partition is FIFO_Queuing. The rules for the FIFO_Queuing policy are specified in 9.5.3 and 9.7.1.
!ASIS
No changes needed.
!ACATS test
No test needed.
!appendix

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