From: Sergey Nechaev <nechaev@XXXXXXXXXXX>
Date: July 4, 2007 11:33:56 PM CDT
To: mpi-comments@XXXXXXXXXXXXX
Cc: Victor Malyshkin <malysh@XXXXXXXXXXX>
Subject: Non-blocking version of MPI_Comm_accept

Dear colleagues, 

First of all we'd like to thank you for you hard work on MPI standards.

However, non-blocking version of MPI_Comm_accept (MPI_Comm_iaccept) is
missing. 

The semantics of this non-blocking version should be similar to
MPI_Iprobe:
An extra parameter int* success_flag is added to parameters list.
MPI_Comm_iaccept returns immediately and the value of success_flag after
return is 1 if client has connected and 0 otherwise. If client has
connected, new intercommunicator is created. Otherwise intercommunicator
becomes MPI_COMM_NULL.

We have implemented MPI_Comm_iaccept for MPICH2-1.0.5.p4 distribution.
But, as there's no MPI_Comm_iaccept in the MPI2.0 standard, programs
using it are not portable.

We would appreciate if you add this function:

int MPI_Comm_iaccept(char *port_name, MPI_Info info, int root, MPI_Comm
comm, MPI_Comm *newcomm, int* success_flag); 

to the future versions of standard.

With best regards,
Sergey Nechaev
Georgy Tschukin
Supercomputer Software Department, ICM MG SB RAS