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MPI_Rsend - Ready send.
#include <mpi.h>
int MPI_Rsend(const void *buf, int count, MPI_Datatype datatype, int dest,
int tag, MPI_Comm comm)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_RSEND(BUF, COUNT, DATATYPE, DEST, TAG, COMM, IERROR)
<type> BUF(*)
INTEGER COUNT, DATATYPE, DEST, TAG, COMM, IERROR
USE mpi_f08
MPI_Rsend(buf, count, datatype, dest, tag, comm, ierror)
TYPE(*), DIMENSION(..), INTENT(IN) :: buf
INTEGER, INTENT(IN) :: count, dest, tag
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Comm), INTENT(IN) :: comm
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- 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).
- IERROR
- Fortran
only: Error status (integer).
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.
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.
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