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NAME

       MPI_File_read_all_begin  -  Reads 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_read_all_begin(MPI_File fh, void *buf,
                  int count, MPI_Datatype datatype)

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

C++ Syntax

       #include <mpi.h>
       void MPI::File::Read_all_begin(void* buf, int count,
            const MPI::Datatype& datatype)

INPUT/OUTPUT PARAMETER

       fh        File handle (handle).

INPUT PARAMETERS

       count     Number of elements in buffer (integer).

       datatype  Data type of each buffer element (handle).

OUTPUT PARAMETERS

       buf       Initial address of buffer (choice).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_File_read_all_begin is the  beginning  part  of  a  split  collective  operation  that
       attempts  to read from 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
       into the user's buffer buf.  The data is taken out of 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.