NAME

       MPI_File_write_all_begin - Writes a file starting at the locations specified by individual file pointers;
       beginning part of a split collective routine (nonblocking).

SYNTAX

C Syntax

       #include <mpi.h> int MPI_File_write_all_begin(MPI_File fh, const void *buf,      int count,  MPI_Datatype
       datatype)

Fortran Syntax

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_FILE_WRITE_ALL_BEGIN(FH, BUF, COUNT, DATATYPE, IERROR)
            <type>    BUF(*)
            INTEGER   FH, COUNT, DATATYPE, IERROR

C++ Syntax

       #include <mpi.h>
       void MPI::File::Write_all_begin(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

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_File_write_all_begin  is  the beginning part of a split collective, nonblocking routine that 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.

NOTES

       All the nonblocking collective routines for data access are "split" into two routines, each  with  _begin
       or  _end  as  a  suffix.  These  split collective routines are subject to the semantic rules described in
       Section 9.4.5 of the MPI-2 standard.

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.