17.2.305. MPI_Rsend

MPI_Rsend - Ready send.

17.2.305.1. SYNTAX

17.2.305.1.1. C Syntax

#include <mpi.h>

int MPI_Rsend(const void *buf, int count, MPI_Datatype datatype, int dest,
     int tag, MPI_Comm comm)

17.2.305.1.2. Fortran Syntax

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

17.2.305.1.3. Fortran 2008 Syntax

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

17.2.305.2. 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).

17.2.305.3. OUTPUT PARAMETER

  • IERROR: Fortran only: Error status (integer).

17.2.305.4. 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.

17.2.305.5. ERRORS

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument.

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.