openmpi/src/mpi/c/alltoall.c

/*
 * $HEADER$
 */

#include "ompi_config.h"
#include <stdio.h>

#include "mpi.h"
#include "mpi/c/bindings.h"
#include "mca/coll/coll.h"
#include "communicator/communicator.h"

#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Alltoall = PMPI_Alltoall
#endif

#if OMPI_PROFILING_DEFINES
#include "mpi/c/profile/defines.h"
#endif

static const char FUNC_NAME[] = "MPI_Alltoall";


int MPI_Alltoall(void *sendbuf, int sendcount, MPI_Datatype sendtype,
		 void *recvbuf, int recvcount, MPI_Datatype recvtype, 
                 MPI_Comm comm) 
{
    int err;

    if (MPI_PARAM_CHECK) {

      /* Unrooted operation -- same checks for all ranks on both
         intracommunicators and intercommunicators */

      OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
      if (ompi_comm_invalid(comm)) {
	return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM, 
                                     FUNC_NAME);
      }

      if ((MPI_DATATYPE_NULL == sendtype) || 
          (MPI_DATATYPE_NULL == recvtype)) {
        return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_TYPE, FUNC_NAME);
      }
    
      if ((sendcount < 0) || (recvcount < 0)) {
        return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_COUNT, FUNC_NAME);
      }
    }

    /* Invoke the coll component to perform the back-end operation */

    err = comm->c_coll.coll_alltoall(sendbuf, sendcount, sendtype, 
                                     recvbuf, recvcount, recvtype,
                                     comm);
    OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
}