MPI_File_seek_shared(3OpenMPI) MPI_File_seek_shared(3OpenMPI)
NAME
MPI_File_seek_shared - Updates the global shared file pointer (collec-
tive).
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 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 posi-
tion 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 syn-
chronized 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-porta-
ble 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++ func-
tions 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)
Mac OS X 10.6 - Generated Thu Sep 17 20:13:02 CDT 2009