17.2.154. MPI_File_write_ordered

MPI_File_write_ordered - Writes a file at a location specified by a shared file pointer (blocking, collective).

17.2.154.1. Syntax

17.2.154.1.1. C Syntax

#include <mpi.h>

int MPI_File_write_ordered(MPI_File fh, const void *buf,
    int count, MPI_Datatype datatype,
    MPI_Status *status)

17.2.154.1.2. Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'

MPI_FILE_WRITE_ORDERED(FH, BUF, COUNT, DATATYPE,
    STATUS, IERROR)
    <type>  BUF(*)
    INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE), IERROR

17.2.154.1.3. Fortran 2008 Syntax

USE mpi_f08

MPI_File_write_ordered(fh, buf, count, datatype, status, ierror)
    TYPE(MPI_File), INTENT(IN) :: fh
    TYPE(*), DIMENSION(..), INTENT(IN) :: buf
    INTEGER, INTENT(IN) :: count
    TYPE(MPI_Datatype), INTENT(IN) :: datatype
    TYPE(MPI_Status) :: status
    INTEGER, OPTIONAL, INTENT(OUT) :: ierror

17.2.154.2. Input Parameters

  • 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).

17.2.154.3. Output Parameters

  • status : Status object (Status).

  • IERROR : Fortran only: Error status (integer).

17.2.154.4. Description

MPI_File_write_ordered is a collective routine. This routine must be called by all processes in the communicator group associated with the file handle fh. Each process may pass different argument values for the datatype and count arguments. Each process attempts to write, into the file associated with fh, a total number of count data items having datatype type contained in the user’s buffer buf. For each process, the location in the file at which data is written is the position at which the shared file pointer would be after all processes whose ranks within the group are less than that of this process had written their data. MPI_File_write_ordered returns the number of datatype elements written in status. The shared file pointer is updated by the amounts of data requested by all processes of the group.

17.2.154.5. 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. For MPI I/O function errors, the default error handler is set to MPI_ERRORS_RETURN. The error handler may be changed with MPI_File_set_errhandler; the predefined error handler MPI_ERRORS_ARE_FATAL may be used to make I/O errors fatal. Note that MPI does not guarantee that an MPI program can continue past an error.