NAME

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

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_File_write_ordered(MPI_File fh, const void *buf,
            int count, MPI_Datatype datatype,
            MPI_Status *status)

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

C++ Syntax

       #include <mpi.h>
       void MPI::File::Write_ordered(const void* buf, int count,
            const MPI::Datatype& datatype, MPI::Status& status)

       void MPI::File::Write_ordered(const void* buf, int count,
            const MPI::Datatype& datatype)

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).

OUTPUT PARAMETERS

       status    Status object (Status).

       IERROR    Fortran only: Error status (integer).

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.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and
       Fortran routines in the last argument. C++ functions do not return errors. If the  default
       error  handler  is  set  to  MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception
       mechanism will be used to throw an MPI::Exception object.

       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.