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 system) 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_SEQUENTIAL 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.