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MPI_File_iwrite_at_all.3.rst

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MPI_File_iwrite_at_all

:ref:`MPI_File_iwrite_at_all` |mdash| Writes a file at an explicitly specified offset (nonblocking, collective).

SYNTAX

C Syntax

#include <mpi.h>

int MPI_File_iwrite_at_all(MPI_File fh, MPI_Offset offset,
     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_AT_ALL(FH, OFFSET, BUF, COUNT, DATATYPE, REQUEST, IERROR)
     <type>  BUF(*)
     INTEGER FH, COUNT, DATATYPE, REQUEST, IERROR
     INTEGER(KIND=MPI_OFFSET_KIND)   OFFSET

Fortran 2008 Syntax

USE mpi_f08
MPI_File_iwrite_at_all(fh, offset, buf, count, datatype, request, ierror)
     TYPE(MPI_File), INTENT(IN) :: fh
     INTEGER(KIND=MPI_OFFSET_KIND), INTENT(IN) :: offset
     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

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

OUTPUT PARAMETERS

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

DESCRIPTION

:ref:`MPI_File_iwrite_at_all` is a nonblocking version of :ref:`MPI_File_write_at_all`. It attempts to write into the file associated with fh (at the offset position) a total number of count data items having datatype type from the user's buffer buf. The offset is in etype units relative to the current view. That is, holes are not counted when locating an offset. The data is written into those parts of the file specified by the current view. :ref:`MPI_File_iwrite_at_all` stores the number of datatype elements actually written in status. All other fields of status are undefined. The request structure can be passed to :ref:`MPI_Wait` or :ref:`MPI_Test`, which will return a status with the number of bytes actually accessed.

It is erroneous to call this function if MPI_MODE_SEQUENTIAL mode was specified when the file was open.

ERRORS