NAME

       MPI_Rsend - Ready send.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Rsend(const void *buf, int count, MPI_Datatype datatype, int dest,
            int tag, MPI_Comm comm)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_RSEND(BUF, COUNT, DATATYPE, DEST, TAG, COMM, IERROR)
            <type>    BUF(*)
            INTEGER   COUNT, DATATYPE, DEST, TAG, COMM, IERROR

C++ Syntax

       #include <mpi.h>
       void Comm::Rsend(const void* buf, int count, const Datatype&
            datatype, int dest, int tag) const

INPUT PARAMETERS

       buf       Initial address of send buffer (choice).

       count     Number of elements in send buffer (nonnegative integer).

       datatype  Datatype of each send buffer element (handle).

       dest      Rank of destination (integer).

       tag       Message tag (integer).

       comm      Communicator (handle).

OUTPUT PARAMETER

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       A  ready  send  may  only  be  called  if the user can guarantee that a receive is already
       posted. It is an error if the receive is not posted before the ready send is called.

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. By default,
       this error handler aborts the MPI job, except for I/O function errors. The  error  handler
       may    be   changed   with   MPI_Comm_set_errhandler;   the   predefined   error   handler
       MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not
       guarantee that an MPI program can continue past an error.