NAME

       MPI_File_seek_shared - Updates the global shared file pointer (collective).

SYNTAX

C Syntax

       #include <mpi.h> int MPI_File_seek_shared(MPI_File fh, MPI_Offset offset,      int whence)

Fortran Syntax (see FORTRAN 77 NOTES)

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_FILE_SEEK_SHARED(FH, OFFSET, WHENCE, IERROR)
            INTEGER   FH, WHENCE, IERROR
            INTEGER(KIND=MPI_OFFSET_KIND) OFFSET

C++ Syntax

       #include <mpi.h>
       void MPI::File::Seek_shared(MPI::Offset offset, int whence)

INPUT PARAMETERS

       fh        File handle (handle).

       offset    File offset (integer).

       whence    Update mode (integer).

OUTPUT PARAMETER

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_File_seek_shared  updates the shared file pointer according to whence, which could have the following
       possible values:

         o    MPI_SEEK_SET - The pointer is set to offset.

         o    MPI_SEEK_CUR - The pointer is set to the current pointer position plus offset.

         o    MPI_SEEK_END - The pointer is set to the end of the file plus offset.

       MPI_File_seek_shared is collective; all the processes in the communicator group associated with the  file
       handle  fh  must  call  MPI_File_seek_shared  with  the  same  offset  and  whence.  All processes in the
       communicator group are synchronized before the shared file pointer is updated.

       The offset can be negative, which allows seeking backwards.  It  is  erroneous  to  seek  to  a  negative
       position in the view. The end of the view is defined to be the position of the next elementary data item,
       relative to the current view, following the last whole elementary data item accessible.

FORTRAN 77 NOTES

       The MPI standard prescribes portable Fortran syntax for the OFFSET argument only for Fortran 90.  FORTRAN
       77 users may use the non-portable syntax

            INTEGER*MPI_OFFSET_KIND OFFSET

       where  MPI_OFFSET_KIND  is  a  constant defined in mpif.h and gives the length of the declared integer in
       bytes.

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.