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MPI_File_iwrite_all.3.rst

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MPI_File_iwrite_all

:ref:`MPI_File_iwrite_all` - Writes a file starting at the location specified by the individual file pointer (nonblocking, collective).

SYNTAX

C Syntax

#include <mpi.h>

int MPI_File_iwrite_all(MPI_File fh, const void *buf, int count,
     MPI_Datatype datatype, MPI_Request *request)

Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_IWRITE_ALL(FH, BUF, COUNT, DATATYPE, REQUEST, IERROR)
     <type>  BUF(*)
     INTEGER FH, COUNT, DATATYPE, REQUEST, IERROR

Fortran 2008 Syntax

USE mpi_f08
MPI_File_iwrite_all(fh, buf, count, datatype, request, ierror)
     TYPE(MPI_File), INTENT(IN) :: fh
     TYPE(*), DIMENSION(..) :: buf
     INTEGER, INTENT(IN) :: count
     TYPE(MPI_Datatype), INTENT(IN) :: datatype
     TYPE(MPI_Request), INTENT(OUT) :: request
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT/OUTPUT PARAMETER

  • fh: File handle (handle).

INPUT PARAMETERS

  • buf: Initial address of buffer (choice).
  • count: Number of elements in buffer (integer).
  • datatype: Data type of each buffer element (handle).

OUTPUT PARAMETER

  • request: Request object (handle).
  • ierror: Fortran only: Error status (integer).

DESCRIPTION

:ref:`MPI_File_iwrite_all` is a nonblocking version of the :ref:`MPI_File_write_all` 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_all` 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.

ERRORS