[Mpi-22] Ticket #46: Add const Keyword to the C bindings- implementation

[Underwood, Keith D]

It would seem like const would eventually have to be cast away for most lower level interfaces.  Portals, Elan, IB Verbs, and as best I can tell MX don't have const on their send buffers... 

Keith 

>-----Original Message-----
>From: mpi-22-bounces_at_[hidden] [mailto:mpi-22-bounces_at_lists.mpi-
>forum.org] On Behalf Of Erez Haba
>Sent: Thursday, March 12, 2009 12:44 PM
>To: MPI 2.2
>Subject: Re: [Mpi-22] Ticket #46: Add const Keyword to the C bindings-
>implementation
>
>No, it's not being cast away (although it is a quick way for you to
>implement it).
>In MPICH2 implementation it trickles down to the lower functions. There are
>very few places where the const is being cast away because ticket #46 does
>not to break backward compatibility.
>For example, when the user function is called (const was not added to the
>MPI_User_function) the implementation must cast away const from the send
>buffer before calling the user function.
>
>Thanks,
>.Erez
>
>-----Original Message-----
>From: mpi-22-bounces_at_[hidden] [mailto:mpi-22-bounces_at_lists.mpi-
>forum.org] On Behalf Of Jeff Squyres
>Sent: Thursday, March 12, 2009 11:34 AM
>To: MPI 2.2
>Subject: Re: [Mpi-22] Ticket #46: Add const Keyword to the C bindings-
>implementation
>
>More importantly, how is const handled?  Is it just cast away inside
>the MPI library?
>
>
>On Mar 12, 2009, at 2:34 PM, Underwood, Keith D wrote:
>
>> Since the main purpose of an implementation for something like
>> adding const is to see how invasive the change is, would it be
>> possible to get a diff against the trees that these were created from?
>>
>> Thanks,
>> Keith
>>
>> From: mpi-22-bounces_at_[hidden] [mailto:mpi-22-
>bounces_at_[hidden]
>> ] On Behalf Of Erez Haba
>> Sent: Thursday, March 12, 2009 12:24 PM
>> To: MPI 2.2
>> Subject: [Mpi-22] Ticket #46: Add const Keyword to the C bindings -
>> implementation
>>
>>
>> Implementation for ticket #46 is now available from ANL (thanks Pavan)
>>
>>
>> tarballs
>>
>http://www.mcs.anl.gov/research/projects/mpich2/downloads/tarballs/nightly/
>const
>>
>>
>> thanks,
>> .Erez
>>
>> _______________________________________________
>> mpi-22 mailing list
>> mpi-22_at_[hidden]
>> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-22
>
>
>--
>Jeff Squyres
>Cisco Systems
>
>_______________________________________________
>mpi-22 mailing list
>mpi-22_at_[hidden]
>http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-22
>
>
>_______________________________________________
>mpi-22 mailing list
>mpi-22_at_[hidden]
>http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-22