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MPI_File_seek_shared(3OpenMPI)                                                MPI_File_seek_shared(3OpenMPI)



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)
           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 fol-lowing following
       lowing 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.




Open MPI 1.2                                   September 2006                 MPI_File_seek_shared(3OpenMPI)