1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/*
* 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 "ompi/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 "ompi/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);
}
/* Do we need to do anything? 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 we're doing
IN_PLACE, however, check recvcount, not sendcount. */
if ((MPI_IN_PLACE != sendbuf && 0 == sendcount) ||
(0 == recvcount)) {
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);
}
|
