81 строка
2.6 KiB
C
81 строка
2.6 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include <stdio.h>
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#include "mpi/c/bindings.h"
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#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
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#pragma weak MPI_Comm_get_errhandler = PMPI_Comm_get_errhandler
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#endif
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#if OMPI_PROFILING_DEFINES
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#include "mpi/c/profile/defines.h"
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#endif
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static const char FUNC_NAME[] = "MPI_Comm_get_errhandler";
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int MPI_Comm_get_errhandler(MPI_Comm comm, MPI_Errhandler *errhandler)
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{
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/* Error checking */
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if (MPI_PARAM_CHECK) {
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OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
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if (NULL == comm ||
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MPI_COMM_NULL == comm) {
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return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG,
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FUNC_NAME);
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} else if (NULL == errhandler) {
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return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG,
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FUNC_NAME);
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}
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}
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/* Return the errhandler. A quandry. Should we increase the
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refcount here?
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- Consider that if we *get* an errhandler, we don't have to free
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it. It's just a handle that was returned to the user. If they
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never free it (and we increased the refcount), then it'll never
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be freed.
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- However, if we *don't* increase it and the user *does* free it,
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then this could cause the refcount to go to 0 prematurely, and
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a communicator could be left with a stale error handler.
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Add to the mix that MPI-1:196:8-11 says that MPI_ERRHANDLER_FREE
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will only free the error handler when all the communicators using
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it have been freed.
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All in all, it seems like we should increase the refcount to be
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safe here. We're still conformant -- error handlers won't be
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freed until all the communicators (or other objects using them)
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are freed *and* any outstanding handles returned by this function
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(or its peers) are also freed.
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*/
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OBJ_RETAIN(comm->error_handler);
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*errhandler = comm->error_handler;
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/* All done */
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return MPI_SUCCESS;
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}
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