NAME

       MPI_Comm_accept -  Accept a connection from another MPI process

SYNOPSIS

       #include <mpi.h>
       int
       MPI_Comm_accept(char *port_name, MPI_Info info, int root, MPI_Comm comm,
                      MPI_Comm *newcomm)

INPUT PARAMETERS

       port_name
              - port name (only used at root)
       info   - extra information handle (only used at root)
       root   - rank in comm of root node
       comm   - intracommunicator over which the call is collective

OUTPUT PARAMETER

       newcomm
              - intercommunicator with client as remote group

DESCRIPTION

       The  MPI_Comm_accept  and  MPI_Comm_connect  calls simulate the well-understood accept() /
       connect() semantics of standard socket programming -- a client "connects" to a server.

       LAM/MPI allows for previously-unrelated MPI programs to join into a MPI program with these
       calls.  Both MPI programs must be running by the same user in the same LAM universe (i.e.,
       in the scope of a single lamboot).

NOTES FOR FORTRAN

       All MPI routines in Fortran (except for MPI_WTIME  and  MPI_WTICK  )  have  an  additional
       argument  ierr  at  the  end  of  the  argument list.  ierr is an integer and has the same
       meaning as the  return  value  of  the  routine  in  C.   In  Fortran,  MPI  routines  are
       subroutines, and are invoked with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.

USAGE WITH IMPI EXTENSIONS

       The  IMPI  standard  only supports MPI-1 functions.  Hence, this function is currently not
       designed to operate within an IMPI job.

ERRORS

       If an error occurs in an MPI function, the current MPI error handler is called  to  handle
       it.   By default, this error handler aborts the MPI job.  The error handler may be changed
       with MPI_Errhandler_set ; the predefined error handler MPI_ERRORS_RETURN may  be  used  to
       cause  error values to be returned (in C and Fortran; this error handler is less useful in
       with the C++ MPI bindings.   The  predefined  error  handler  MPI::ERRORS_THROW_EXCEPTIONS
       should  be  used in C++ if the error value needs to be recovered).  Note that MPI does not
       guarantee that an MPI program can continue past an error.

       All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error value;  C  routines  as
       the value of the function and Fortran routines in the last argument.  The C++ bindings for
       MPI do not return error  values;  instead,  error  values  are  communicated  by  throwing
       exceptions of type MPI::Exception (but not by default).  Exceptions are only thrown if the
       error value is not MPI::SUCCESS .

       Note that if the MPI::ERRORS_RETURN handler is set in C++, while MPI functions will return
       upon an error, there will be no way to recover what the actual error value was.
       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_ERR_COMM
              -  Invalid  communicator.   A  common error is to use a null communicator in a call
              (not even allowed in MPI_Comm_rank ).
       MPI_ERR_ROOT
              - Invalid root.  The root must be specified as a rank in the  communicator.   Ranks
              must be between zero and the size of the communicator minus one.
       MPI_ERR_ARG
              -  Invalid  argument.  Some argument is invalid and is not identified by a specific
              error class.  This is typically a NULL pointer or other such error.
       MPI_ERR_INTERN
              - An internal error has been detected.  This is fatal.  Please send a bug report to
              the LAM mailing list (see http://www.lam-mpi.org/contact.php ).
       MPI_ERR_OTHER
              - Other error; use MPI_Error_string to get more information about this error code.
       MPI_ERR_FLAGS
              -  Mismatch of run-time flags.  For example, an MPI process that is running in lamd
              mode cannot spawn or be connected to a process that is running in c2c mode.

SEE ALSO

       MPI_Close_port(3), MPI_Comm_connect(3), MPI_Comm_disconnect(3), MPI_Open_port(3)

MORE INFORMATION

       For more information, please see the official MPI Forum web site, which contains the  text
       of both the MPI-1 and MPI-2 standards.  These documents contain detailed information about
       each MPI function (most of which is not duplicated in these man pages).

       http://www.mpi-forum.org/

LOCATION

       accept.c