NAME

       MPI_Rget_accumulate  -   Perform  an atomic, one-sided read-and-accumulate operation and return a request
       handle for the operation.

SYNOPSIS

       int MPI_Rget_accumulate(const void *origin_addr, int origin_count,
               MPI_Datatype origin_datatype, void *result_addr, int result_count,
               MPI_Datatype result_datatype, int target_rank, MPI_Aint target_disp,
               int target_count, MPI_Datatype target_datatype, MPI_Op op, MPI_Win win,
               MPI_Request *request)

       MPI_Rget_accumulate is similar to MPI_Get_accumulate , except that it allocates a  communication  request
       object  and associates it with the request handle (the argument request) that can be used to wait or test
       for completion. The completion of an MPI_Rget_accumulate operation indicates that the data  is  available
       in the result buffer and the origin buffer is free to be updated. It does not indicate that the operation
       has been completed at the target window.

INPUT PARAMETERS

       origin_addr
              - initial address of buffer (choice)
       origin_count
              - number of entries in buffer (nonnegative integer)
       origin_datatype
              - datatype of each buffer entry (handle)
       result_addr
              - initial address of result buffer (choice)
       result_count
              - number of entries in result buffer (non-negative integer)
       result_datatype
              - datatype of each entry in result buffer (handle)
       target_rank
              - rank of target (nonnegative integer)
       target_disp
              - displacement from start of window to beginning of target buffer (nonnegative integer)
       target_count
              - number of entries in target buffer (nonnegative integer)
       target_datatype
              - datatype of each entry in target buffer (handle)
       op     - predefined reduce operation (handle)
       win    - window object (handle)

OUTPUT PARAMETERS

       request
              - RMA request (handle)

NOTES

       This operations is atomic with respect to other "accumulate" operations.

       The get and accumulate steps are executed atomically for each basic element in the datatype (see MPI  3.0
       Section 11.7 for details). The predefined operation MPI_REPLACE provides fetch-and-set behavior.

       The  basic  components of both the origin and target datatype must be the same predefined datatype (e.g.,
       all MPI_INT or all MPI_DOUBLE_PRECISION ).

NOTES FOR FORTRAN

       All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argument ierr at the
       end of the argument list.  ierr is an integer and has the same meaning as the return value of the routine
       in C.  In Fortran, MPI routines are subroutines, and are invoked with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.

ERRORS

       All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as the value of  the
       function  and Fortran routines in the last argument.  Before the value is returned, the current MPI error
       handler is called.  By default, this error handler aborts the MPI job.  The error handler may be  changed
       with    MPI_Comm_set_errhandler   (for   communicators),   MPI_File_set_errhandler   (for   files),   and
       MPI_Win_set_errhandler (for RMA windows).  The MPI-1 routine MPI_Errhandler_set may be used but  its  use
       is  deprecated.   The  predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be
       returned.  Note that MPI does not guarentee that an MPI program can continue past an error; however,  MPI
       implementations will attempt to continue whenever possible.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_ERR_ARG
              -  Invalid  argument.   Some  argument  is invalid and is not identified by a specific error class
              (e.g., MPI_ERR_RANK ).
       MPI_ERR_COUNT
              - Invalid count argument.  Count arguments must be non-negative; a count of zero is often valid.
       MPI_ERR_RANK
              - Invalid source or destination rank.  Ranks must be between zero and the size of the communicator
              minus  one;  ranks  in  a  receive  (  MPI_Recv  ,  MPI_Irecv  ,  MPI_Sendrecv , etc.) may also be
              MPI_ANY_SOURCE .

       MPI_ERR_TYPE
              - Invalid datatype argument.  Additionally, this error can occur if  an  uncommitted  MPI_Datatype
              (see MPI_Type_commit ) is used in a communication call.
       MPI_ERR_WIN
              - Invalid MPI window object

SEE ALSO

       MPI_Get_accumulate MPI_Fetch_and_op

                                                    11/9/2015                             MPI_Rget_accumulate(3)