NAME

       MPI_File_write  -  Writes a file starting at the location specified by the individual file
       pointer (blocking, noncollective).

SYNTAX

C Syntax

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

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

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 PARAMETERS

       status    Status object (status).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_File_write  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.  MPI_File_write  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 opened.

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.