:ref:`MPI_File_iwrite` - Writes a file starting at the location specified by the individual file pointer (nonblocking, noncollective).
#include <mpi.h>
int MPI_File_iwrite(MPI_File fh, const void *buf, int count,
MPI_Datatype datatype, MPI_Request *request)
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_IWRITE(FH, BUF, COUNT, DATATYPE, REQUEST, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, REQUEST, IERROR
USE mpi_f08
MPI_File_iwrite(fh, buf, count, datatype, request, ierror)
TYPE(MPI_File), INTENT(IN) :: fh
TYPE(*), DIMENSION(..), INTENT(IN), ASYNCHRONOUS :: buf
INTEGER, INTENT(IN) :: count
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Request), INTENT(OUT) :: request
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
fh
: File handle (handle).
buf
: Initial address of buffer (choice).count
: Number of elements in buffer (integer).datatype
: Data type of each buffer element (handle).
request
: Request object (handle).ierror
: Fortran only: Error status (integer).
:ref:`MPI_File_iwrite` is a nonblocking version of the :ref:`MPI_File_write` interface. It attempts to write into the file associated with fh (at the current individual file pointer position maintained by the system) a total number of count data items having datatype type from the user's buffer buf. The data is written into those parts of the file specified by the current view. :ref:`MPI_File_iwrite` stores the number of datatype elements actually written in status. All other fields of status are undefined.
It is erroneous to call this function if MPI_MODE_SEQUENTIAL mode was specified when the file was open.