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MPI_File_write_at_all(3OpenMPI)                                              MPI_File_write_at_all(3OpenMPI)



NAME
       MPI_File_write_at_all - Writes a file at explicitly specified offsets (blocking, collective).


SYNTAX
       C Syntax
           #include <mpi.h>
           int MPI_File_write_at_all(MPI_File fh, MPI_Offset offset, void *buf,
                  int count, MPI_Datatype datatype, MPI_Status *status)

       Fortran Syntax (see FORTRAN 77 NOTES)
           INCLUDE 'mpif.h'
           MPI_FILE_WRITE_AT_ALL(FH,  OFFSET,  BUF, COUNT,
                   DATATYPE, STATUS,  IERROR)
             <type> BUF(*)
             INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE), IERROR
             INTEGER(KIND=MPI_OFFSET_KIND) OFFSET


C++ Syntax
       #include <mpi.h>
       void MPI::File::Write_at_all(MPI::Offset offset, const void* buf,
            int count, const MPI::Datatype& datatype,
            MPI::Status& status)

       void MPI::File::Write_at_all(MPI::Offset offset, const void* buf,
            int count, const MPI::Datatype& datatype)


INPUT PARAMETERS
       fh        File handle (handle).

       offset    File offset (integer).

       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_at_all is a collective routine that attempts to write into the file associated with fh
       (at the offset position) a total number of count data items having  datatype  type  from  the  user's
       buffer  buf.   The  offset  is  in  etype  units relative to the current view. That is, holes are not
       counted when locating an offset. The data is written into those parts of the file  specified  by  the
       current  view.  MPI_File_write_at_all stores the number of datatype elements actually written in sta-tus. status.
       tus.  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.


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_write_at_all(3OpenMPI)