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MPI_File_iwrite(3OpenMPI)                                                          MPI_File_iwrite(3OpenMPI)



NAME
       MPI_File_iwrite  -  Writes  a  file starting at the location specified by the individual file pointer
       (nonblocking, noncollective).


SYNTAX
       C Syntax
           #include <mpi.h>
           int MPI_File_iwrite(MPI_File fh, void *buf, int count,
                  MPI_Datatype datatype, MPI_Request *request)

       Fortran Syntax
           INCLUDE 'mpif.h'
           MPI_FILE_IWRITE(FH, BUF, COUNT, DATATYPE, REQUEST, IERROR)
                 <TYPE>         BUF(*)
                 INTEGER        FH, COUNT, DATATYPE, REQUEST, IERROR


C++ Syntax
       #include <mpi.h>
       MPI::Request MPI::File::Iwrite(const void* buf, int count,
            const MPI::Datatype& datatype)


INPUT/OUTPUT PARAMETER
       fh        File handle (handle).


INPUT PARAMETERS
       buf       Initial address of buffer (choice).

       count     Number of elements in buffer (integer).

       datatype  Data type of each buffer element (handle).


OUTPUT PARAMETER
       request   Request object (handle).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPI_File_iwrite is a nonblocking version of the MPI_File_write interface. It attempts to  write  into
       the  file  associated with fh (at the current individual file pointer position maintained by the sys-tem) system)
       tem) a total number of count data items having datatype type from the user's buffer buf.  The data is
       written into those parts of the file specified by the current view. MPI_File_iwrite stores the number
       of datatype elements actually written in status.  All other fields of status are undefined.

       It is erroneous to call this function if MPI_MODE_SEQENTIAL mode was  specified  when  the  file  was
       open.


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_iwrite(3OpenMPI)