From: Patrick Geoffray <patrick@XXXXXXXX>
Date: January 9, 2008 2:53:23 PM CST
To: mpi-21@XXXXXXXXXXXXX
Subject: Re: [mpi-21] Proposal EH2: add const keyword to the C bindings
Reply-To: mpi-21@XXXXXXXXXXXXX

Erez Haba wrote:
> This issue is related to the "send buffer access". I say "wait,  
> let's make it right for the users by restricting the implementers".

I agree with Erez, common sense is that a send is a read-only  
operation. Furthermore, the implementer's interest in not respecting  
this common sense is not obvious at all, an extra copy is a  
reasonable overhead when supporting heterogeneous configurations.

I am not fond of adding const to the C bindings as it could introduce  
portability issues regarding compilers. I would prefer to simply  
change the standard to allow overlapping sends and read access to  
send buffers.

Patrick