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MPI_File_write_ordered(3OpenMPI)                                            MPI_File_write_ordered(3OpenMPI)



NAME
       MPI_File_write_ordered  -  Writes  a file at a location specified by a shared file pointer (blocking,
       collective).


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

       Fortran Syntax
           INCLUDE 'mpif.h'
           MPI_FILE_WRITE_ORDERED(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_ordered(const void* buf, int count,
            const MPI::Datatype& datatype, MPI::Status& status)

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


INPUT PARAMETERS
       fh        File handle (handle).

       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_ordered is a collective routine. This routine must be called by all processes  in  the
       communicator group associated with the file handle fh.  Each process may pass different argument val-ues values
       ues for the datatype and count arguments. Each process attempts to write, into  the  file  associated
       with  fh, a total number of count data items having datatype type contained in the user's buffer buf.
       For each process, the location in the file at which data is written is  the  position  at  which  the
       shared  file  pointer would be after all processes whose ranks within the group are less than that of
       this process had written their data. MPI_File_write_ordered returns the number of  datatype  elements
       written  in  status.  The shared file pointer is updated by the amounts of data requested by all pro-cesses processes
       cesses of the group.


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_ordered(3OpenMPI)