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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, void *buf,
                  int count, MPI_Datatype datatype)

Fortran Syntax

           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.



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