78 строки
2.5 KiB
C
78 строки
2.5 KiB
C
/*
|
|
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
|
|
* University Research and Technology
|
|
* Corporation. All rights reserved.
|
|
* Copyright (c) 2004-2005 The University of Tennessee and The University
|
|
* of Tennessee Research Foundation. All rights
|
|
* reserved.
|
|
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
|
|
* University of Stuttgart. All rights reserved.
|
|
* Copyright (c) 2004-2005 The Regents of the University of California.
|
|
* All rights reserved.
|
|
* $COPYRIGHT$
|
|
*
|
|
* Additional copyrights may follow
|
|
*
|
|
* $HEADER$
|
|
*/
|
|
|
|
#include "ompi_config.h"
|
|
#include <stdio.h>
|
|
|
|
#include "mpi/c/bindings.h"
|
|
#include "ompi/datatype/datatype.h"
|
|
|
|
#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
|
|
#pragma weak MPI_Allgather = PMPI_Allgather
|
|
#endif
|
|
|
|
#if OMPI_PROFILING_DEFINES
|
|
#include "mpi/c/profile/defines.h"
|
|
#endif
|
|
|
|
static const char FUNC_NAME[] = "MPI_Allgather";
|
|
|
|
|
|
int MPI_Allgather(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 */
|
|
|
|
err = MPI_SUCCESS;
|
|
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
|
|
if (ompi_comm_invalid(comm)) {
|
|
OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM, FUNC_NAME);
|
|
} else if (MPI_DATATYPE_NULL == recvtype) {
|
|
err = MPI_ERR_TYPE;
|
|
} else if (recvcount < 0) {
|
|
err = MPI_ERR_COUNT;
|
|
} else if (MPI_IN_PLACE == recvbuf) {
|
|
return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ARG, FUNC_NAME);
|
|
} else if (MPI_IN_PLACE != sendbuf) {
|
|
OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtype, sendcount);
|
|
}
|
|
OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
|
|
}
|
|
|
|
/* Can we optimize? Everyone had to give the same send signature,
|
|
which means that everyone must have given a sendcount > 0 if
|
|
there's anything to send. */
|
|
|
|
if (sendcount == 0) {
|
|
return MPI_SUCCESS;
|
|
}
|
|
|
|
/* Invoke the coll component to perform the back-end operation */
|
|
|
|
err = comm->c_coll.coll_allgather(sendbuf, sendcount, sendtype,
|
|
recvbuf, recvcount, recvtype, comm);
|
|
OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
|
|
}
|
|
|