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// ---------------------------------------------------------------------
//
// Copyright (C) 1998 - 2018 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#include <deal.II/base/thread_management.h>
#include <deal.II/base/subscriptor.h>
#include <deal.II/base/logstream.h>
#include <typeinfo>
#include <string>
#include <iostream>
DEAL_II_NAMESPACE_OPEN
static const char *unknown_subscriber = "unknown subscriber";
Subscriptor::Subscriptor ()
:
counter (0),
object_info (nullptr)
{
// this has to go somewhere to avoid an extra warning.
(void)unknown_subscriber;
}
Subscriptor::Subscriptor (const Subscriptor &)
:
counter (0),
object_info (nullptr)
{}
Subscriptor::Subscriptor (Subscriptor &&subscriptor) noexcept
:
counter(0),
object_info (subscriptor.object_info)
{
subscriptor.check_no_subscribers();
}
Subscriptor::~Subscriptor ()
{
check_no_subscribers();
object_info = nullptr;
}
void Subscriptor::check_no_subscribers () const noexcept
{
// Check whether there are still subscriptions to this object. If so, output
// the actual name of the class to which this object belongs, i.e. the most
// derived class. Note that the name may be mangled, so it need not be the
// clear-text class name. However, you can obtain the latter by running the
// c++filt program over the output.
#ifdef DEBUG
// If there are still active pointers, show a message and kill the program.
// However, under some circumstances, this is not so desirable. For example,
// in code like this:
//
// Triangulation tria;
// DoFHandler *dh = new DoFHandler(tria);
// ...some function that throws an exception
//
// the exception will lead to the destruction of the triangulation, but since
// the dof_handler is on the heap it will not be destroyed. This will trigger
// an assertion in the triangulation. If we kill the program at this point, we
// will never be able to learn what caused the problem. In this situation,
// just display a message and continue the program.
if (counter != 0)
{
if (std::uncaught_exception() == false)
{
std::string infostring;
for (map_iterator it = counter_map.begin(); it != counter_map.end(); ++it)
{
if (it->second > 0)
infostring += std::string("\n from Subscriber ")
+ std::string(it->first);
}
if (infostring == "")
infostring = "<none>";
AssertNothrow (counter == 0,
ExcInUse (counter.load(), object_info->name(), infostring));
}
else
{
std::cerr << "---------------------------------------------------------"
<< std::endl
<< "An object pointed to by a SmartPointer is being destroyed."
<< std::endl
<< "Under normal circumstances, this would abort the program."
<< std::endl
<< "However, another exception is being processed at the"
<< std::endl
<< "moment, so the program will continue to run to allow"
<< std::endl
<< "this exception to be processed."
<< std::endl
<< "---------------------------------------------------------"
<< std::endl;
}
}
#endif
}
Subscriptor &Subscriptor::operator = (const Subscriptor &s)
{
check_no_subscribers();
object_info = s.object_info;
return *this;
}
Subscriptor &Subscriptor::operator = (Subscriptor &&s) noexcept
{
check_no_subscribers();
s.check_no_subscribers();
object_info = s.object_info;
return *this;
}
void
Subscriptor::subscribe(const char *id) const
{
#ifdef DEBUG
if (object_info == nullptr)
object_info = &typeid(*this);
++counter;
// This feature is disabled when we compile with threads: see the
// documentation of this class.
# ifndef DEAL_II_WITH_THREADS
const char *const name = (id != 0) ? id : unknown_subscriber;
map_iterator it = counter_map.find(name);
if (it == counter_map.end())
counter_map.insert(map_value_type(name, 1U));
else
it->second++;
# else
(void)id;
# endif
#else
(void)id;
#endif
}
void
Subscriptor::unsubscribe(const char *id) const
{
#ifdef DEBUG
const char *name = (id != nullptr) ? id : unknown_subscriber;
AssertNothrow (counter>0, ExcNoSubscriber(object_info->name(), name));
// This is for the case that we do
// not abort after the exception
if (counter == 0)
return;
--counter;
// This feature is disabled when we compile with threads: see the
// documentation of this class.
# ifndef DEAL_II_WITH_THREADS
map_iterator it = counter_map.find(name);
AssertNothrow (it != counter_map.end(), ExcNoSubscriber(object_info->name(), name));
AssertNothrow (it->second > 0, ExcNoSubscriber(object_info->name(), name));
it->second--;
# endif
#else
(void)id;
#endif
}
unsigned int Subscriptor::n_subscriptions () const
{
return counter;
}
void Subscriptor::list_subscribers () const
{
#ifndef DEAL_II_WITH_THREADS
for (map_iterator it = counter_map.begin();
it != counter_map.end(); ++it)
deallog << it->second << '/'
<< counter << " subscriptions from \""
<< it->first << '\"' << std::endl;
#else
deallog << "No subscriber listing with multithreading" << std::endl;
#endif
}
DEAL_II_NAMESPACE_CLOSE
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