17.2.47. MPI_Comm_connect

MPI_Comm_connect - Establishes communication with a server.

17.2.47.1. Syntax

17.2.47.1.1. C Syntax

#include <mpi.h>

int MPI_Comm_connect(const char *port_name, MPI_Info info, int root,
    MPI_Comm comm, MPI_Comm *newcomm)

17.2.47.1.2. Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'

MPI_COMM_CONNECT(PORT_NAME, INFO, ROOT, COMM, NEWCOMM, IERROR)
    CHARACTER*(*)   PORT_NAME
    INTEGER     INFO, ROOT, COMM, NEWCOMM, IERROR

17.2.47.1.3. Fortran 2008 Syntax

USE mpi_f08

MPI_Comm_connect(port_name, info, root, comm, newcomm, ierror)
    CHARACTER(LEN=*), INTENT(IN) :: port_name
    TYPE(MPI_Info), INTENT(IN) :: info
    INTEGER, INTENT(IN) :: root
    TYPE(MPI_Comm), INTENT(IN) :: comm
    TYPE(MPI_Comm), INTENT(OUT) :: newcomm
    INTEGER, OPTIONAL, INTENT(OUT) :: ierror

17.2.47.2. Input Parameters

  • port_name : Port name (string, used only on root).

  • info : Options given by root for the connect (handle, used only on root). No options currently supported.

  • root : Rank in comm of root node (integer).

  • comm : Intracommunicator over which call is collective (handle).

17.2.47.3. Output Parameters

  • newcomm : Intercommunicator with client as remote group (handle)

  • IERROR : Fortran only: Error status (integer).

17.2.47.4. Description

MPI_Comm_connect establishes communication with a server specified by port_name. It is collective over the calling communicator and returns an intercommunicator in which the remote group participated in an MPI_Comm_accept. The MPI_Comm_connect call must only be called after the MPI_Comm_accept call has been made by the MPI job acting as the server. If the named port does not exist (or has been closed), MPI_Comm_connect raises an error of class MPI_ERR_PORT. MPI provides no guarantee of fairness in servicing connection attempts. That is, connection attempts are not necessarily satisfied in the order in which they were initiated, and competition from other connection attempts may prevent a particular connection attempt from being satisfied. The port_name parameter is the address of the server. It must be the same as the name returned by MPI_Open_port on the server.

17.2.47.5. Errors

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error. See the MPI man page for a full list of MPI error codes.

See also

MPI_Comm_accept