As far as I know, this propsal is technical wrong: MPI-2, Sect.2.5.4, page 10, lines 40-41 clearly allows the changing of the value of MPI::COMM_WORLD and MPI::COMM_SELF in MPI_Init and MPI_Finalize. Therefore, I do not expect, that const is correct. Remember that in Ballot 1&2, the MPI Forum already decided MPI-2 Page 343, line 44 Remove the const from const MPI::Datatype. Page 344, lines 13, 23, 32, 38, and 47 Remove the const from const MPI::Datatype. Page 345, lines 5 and 11 Remove the const from const MPI::Datatype. See http://www.cs.uiuc.edu/homes/wgropp/projects/parallel/MPI/mpi-errata/errata-... And on Jan. 2008 meeting, positve straw vtes wer given for (in http://www.cs.uiuc.edu/homes/wgropp/projects/parallel/MPI/mpi-errata/ballot3... ) 6. MPI-2, page 345, line 37: Remove the const from const MPI::Op. MPI-2, page 346, line 20: Remove the const from const MPI::Group. MPI-2, page 346, add after line 34: Advice to implementors. If an implementation does not change the value of predefined handles while execution of MPI Init, the implementation is free to define the predefined operation handles as const MPI::Op and the predefined group handle MPI::GROUP EMPTY as const MPI::Group. Other predefined handles must not be ”const” because they are allowed as INOUT argument in the MPI COMM SET NAME/ATTR and MPI TYPE SET NAME/ATTR routines. I'll move this item from Ballot 3 to Ballot 4 because the last sentence is not needed when your Proposal "Ballot 4 proposal: INOUT arguments" will be accepted. Best regards Rolf On Mon, 21 Jan 2008 10:40:39 -0500 Jeff Squyres <jsquyres_at_[hidden]> wrote:
This is not already on Bill's errata page.
Proposal: Make MPI::COMM_WORLD and MPI::COMM_SELF be "const".
Change MPI-2:B.2 p345:18 from
// Type: MPI::Intracomm to // Type: const MPI::Intracomm
Rationale: The COMM_WORLD and COMM_SELF C++ handles were erroneously not marked "const" because of the incorrect INOUT MPI handle parameter designation of the MPI_COMM_SET_ERRHANDLER, MPI_COMM_SET_ATTR, and MPI_COMM_SET_ERRHANDLER functions. This caused the C++ bindings methods to not be const, resulting in compile errors if COMM_WORLD was const and you invoked any of the methods listed above (e.g., MPI::COMM_WORLD.Set_errhandler(...)).
The proper solution is to have all the MPI handle arguments be IN instead of INOUT (covered in another proposal) and therefore have the Set_* functions be const (also covered that other proposal). Once that solution is in place, COMM_WORLD and COMM_SELF should be marked as "const". Not that many other predefined MPI C++ handles are already const; some erroneously had their "const" designation removed in ballot 2 -- a different proposal seeks to restore their "const" status.
NOTE: This proposal depends on the "change some INOUT parameters to IN" proposal.
-- Jeff Squyres Cisco Systems
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