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// -*- 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 (c) 2007 Cisco Systems, Inc. All rights reserved.
// $COPYRIGHT$
//
// Additional copyrights may follow
//
// $HEADER$
//
// do not include ompi_config.h because it kills the free/malloc defines
#include "mpi.h"
#include "ompi/mpi/cxx/mpicxx.h"
#include "opal/threads/mutex.h"
#include "ompi/communicator/communicator.h"
#include "ompi/attribute/attribute.h"
#include "ompi/errhandler/errhandler.h"
static void cxx_comm_keyval_destructor(int keyval);
//
// These functions are all not inlined because they need to use locks to
// protect the handle maps and it would be bad to have those in headers
// because that would require that we always install the lock headers.
// Instead we take the function call hit (we're locking - who cares about
// a function call. And these aren't exactly the performance critical
// functions) and make everyone's life easier.
//
// construction
MPI::Comm::Comm()
{
}
// copy
MPI::Comm::Comm(const Comm_Null& data) : Comm_Null(data)
{
}
void
MPI::Comm::Set_errhandler(const MPI::Errhandler& errhandler)
{
my_errhandler = (MPI::Errhandler *)&errhandler;
OPAL_THREAD_LOCK(MPI::mpi_map_mutex);
MPI::Comm::mpi_comm_err_map[mpi_comm] = this;
OPAL_THREAD_UNLOCK(MPI::mpi_map_mutex);
(void)MPI_Errhandler_set(mpi_comm, errhandler);
}
//JGS I took the const out because it causes problems when trying to
//call this function with the predefined NULL_COPY_FN etc.
int
MPI::Comm::do_create_keyval(MPI_Comm_copy_attr_function* c_copy_fn,
MPI_Comm_delete_attr_function* c_delete_fn,
Copy_attr_function* cxx_copy_fn,
Delete_attr_function* cxx_delete_fn,
void* extra_state)
{
int keyval, ret, count = 0;
ompi_attribute_fn_ptr_union_t copy_fn;
ompi_attribute_fn_ptr_union_t delete_fn;
Copy_attr_function *cxx_pair_copy = NULL;
Delete_attr_function *cxx_pair_delete = NULL;
// We do not call MPI_Comm_create_keyval() here because we need to
// pass in a special destructor to the backend keyval creation
// that gets invoked when the keyval's reference count goes to 0
// and is finally destroyed (i.e., clean up some caching/lookup
// data here in the C++ bindings layer). This destructor is
// *only* used in the C++ bindings, so it's not set by the C
// MPI_Comm_create_keyval(). Hence, we do all the work here (and
// ensure to set the destructor atomicly when the keyval is
// created).
// Error check. Must have exactly 2 non-NULL function pointers.
if (NULL != c_copy_fn) {
copy_fn.attr_communicator_copy_fn =
(MPI_Comm_internal_copy_attr_function*) c_copy_fn;
++count;
}
if (NULL != c_delete_fn) {
delete_fn.attr_communicator_delete_fn = c_delete_fn;
++count;
}
if (NULL != cxx_copy_fn) {
copy_fn.attr_communicator_copy_fn =
(MPI_Comm_internal_copy_attr_function*) ompi_mpi_cxx_comm_copy_attr_intercept;
cxx_pair_copy = cxx_copy_fn;
++count;
}
if (NULL != cxx_delete_fn) {
delete_fn.attr_communicator_delete_fn =
ompi_mpi_cxx_comm_delete_attr_intercept;
cxx_pair_delete = cxx_delete_fn;
++count;
}
if (2 != count) {
return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG,
"MPI::Comm::Create_keyval");
}
ret = ompi_attr_create_keyval(COMM_ATTR, copy_fn, delete_fn,
&keyval, extra_state, 0,
cxx_comm_keyval_destructor);
if (OMPI_SUCCESS != ret) {
return ret;
}
keyval_pair_t* copy_and_delete =
new keyval_pair_t(cxx_pair_copy, cxx_pair_delete);
OPAL_THREAD_LOCK(MPI::mpi_map_mutex);
MPI::Comm::mpi_comm_keyval_fn_map[keyval] = copy_and_delete;
OPAL_THREAD_UNLOCK(MPI::mpi_map_mutex);
return keyval;
}
// This function is called back out of the keyval destructor in the C
// layer when the keyval is not be used by any attributes anymore,
// anywhere. So we can definitely safely remove the entry for this
// keyval from the C++ map.
static void cxx_comm_keyval_destructor(int keyval)
{
OPAL_THREAD_LOCK(MPI::mpi_map_mutex);
if (MPI::Comm::mpi_comm_keyval_fn_map.end() !=
MPI::Comm::mpi_comm_keyval_fn_map.find(keyval) &&
NULL != MPI::Comm::mpi_comm_keyval_fn_map[keyval]) {
delete MPI::Comm::mpi_comm_keyval_fn_map[keyval];
MPI::Comm::mpi_comm_keyval_fn_map.erase(keyval);
}
OPAL_THREAD_UNLOCK(MPI::mpi_map_mutex);
}
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