Line data    Source code

       1             : // The libMesh Finite Element Library.
       2             : // Copyright (C) 2002-2025 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
       3             : 
       4             : // This library is free software; you can redistribute it and/or
       5             : // modify it under the terms of the GNU Lesser General Public
       6             : // License as published by the Free Software Foundation; either
       7             : // version 2.1 of the License, or (at your option) any later version.
       8             : 
       9             : // This library is distributed in the hope that it will be useful,
      10             : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12             : // Lesser General Public License for more details.
      13             : 
      14             : // You should have received a copy of the GNU Lesser General Public
      15             : // License along with this library; if not, write to the Free Software
      16             : // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
      17             : 
      18             : 
      19             : 
      20             : // Local includes
      21             : #include "libmesh/remote_elem.h"
      22             : #include "libmesh/libmesh_singleton.h"
      23             : #include "libmesh/threads.h"
      24             : 
      25             : 
      26             : 
      27             : namespace
      28             : {
      29             : using namespace libMesh;
      30             : 
      31             : // Class to be dispatched by Singleton::setup()
      32             : // to create the \p RemoteElem singleton.
      33             : // While this actual object has file-level static
      34             : // scope and will be initialized before main(),
      35             : // importantly the setup() method will not be invoked
      36             : // until after main().
      37             : class RemoteElemSetup : public Singleton::Setup
      38             : {
      39       16381 :   void setup ()
      40             :   {
      41       16381 :     RemoteElem::create();
      42       16381 :   }
      43             : } remote_elem_setup;
      44             : 
      45             : }
      46             : 
      47             : 
      48             : 
      49             : namespace libMesh
      50             : {
      51             : 
      52             : // Pointer to singleton RemoteElem. As an extern variable with static
      53             : // storage duration, its initial value is nullptr, however we also
      54             : // explicitly initialize it to nullptr to avoid any possible
      55             : // confusion.  The actual remote_elem is constructed when
      56             : // Singleton::setup() is called in the libMeshInit constructor.
      57             : const RemoteElem * remote_elem = nullptr;
      58             : 
      59       32762 : RemoteElem::~RemoteElem()
      60             : {
      61       16381 :   remote_elem = nullptr;
      62             : 
      63             :   // Putting this somewhere to unconfuse Nvidia, which thinks an
      64             :   // object used solely to invoke its constructor is "never
      65             :   // referenced".
      66         462 :   libmesh_ignore(remote_elem_setup);
      67       32762 : }
      68             : 
      69             : 
      70             : 
      71       16381 : const Elem & RemoteElem::create ()
      72             : {
      73             :   // The RemoteElem constructor is private, and RemoteElem::create()
      74             :   // is a static member function, so this makes it difficult to use
      75             :   // std::make_unique<RemoteElem> here. Therefore we just resort to
      76             :   // using the traditional "new" in this instance.
      77       16381 :   if (remote_elem == nullptr)
      78       16381 :     remote_elem = new RemoteElem;
      79             : 
      80       16381 :   return *remote_elem;
      81             : }
      82             : 
      83             : 
      84             : } // namespace libMesh