17.2.65. MPI_Comm_group
MPI_Comm_group - Returns the group associated with a communicator.
17.2.65.1. SYNTAX
17.2.65.1.1. C Syntax
#include <mpi.h>
int MPI_Comm_group(MPI_Comm comm, MPI_Group *group)
17.2.65.1.2. Fortran Syntax
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_COMM_GROUP(COMM, GROUP, IERROR)
INTEGER COMM, GROUP, IERROR
17.2.65.1.3. Fortran 2008 Syntax
USE mpi_f08
MPI_Comm_group(comm, group, ierror)
TYPE(MPI_Comm), INTENT(IN) :: comm
TYPE(MPI_Group), INTENT(OUT) :: group
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
17.2.65.2. INPUT PARAMETER
comm
: Communicator.
17.2.65.3. OUTPUT PARAMETERS
group
: Group in communicator (handle).IERROR
: Fortran only: Error status (integer).
17.2.65.4. DESCRIPTION
If the communicator is an intercommunicator (enables communication between two groups of processes), this function returns the local group. To return the remote group, use the MPI_Comm_remote_group function.
17.2.65.5. 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.