SYNTAX

C Syntax

int MPI_Comm_create_keyval(MPI_Comm_copy_attr_function*
    comm_copy_attr_fn, MPI_Comm_delete_attr_function*
    comm_delete_attr_fn, int* comm_keyval, void* extra_state)

Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_COMM_CREATE_KEYVAL(COMM_COPY_ATTR_FN, COMM_DELETE_ATTR_FN, COMM_KEYVAL, EXTRA_STATE, IERROR)
    EXTERNAL COMM_COPY_ATTR_FN, COMM_DELETE_ATTR_FN
    INTEGER COMM_KEYVAL, IERROR
    INTEGER(KIND=MPI_ADDRESS_KIND) EXTRA_STATE

Fortran 2008 Syntax

USE mpi_f08
MPI_Comm_create_keyval(comm_copy_attr_fn, comm_delete_attr_fn, comm_keyval, extra_state, ierror)
    PROCEDURE(MPI_Comm_copy_attr_function) :: comm_copy_attr_fn
    PROCEDURE(MPI_Comm_delete_attr_function) :: comm_delete_attr_fn
    INTEGER, INTENT(OUT) :: comm_keyval
    INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(IN) :: extra_state
    INTEGER, OPTIONAL, INTENT(OUT) :: ierror