remote_elem.C
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1 // The libMesh Finite Element Library.
2 // Copyright (C) 2002-2014 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"
23 #include "libmesh/threads.h"
24 
25 
26 
27 namespace
28 {
29  using namespace libMesh;
30 
31  typedef Threads::spin_mutex RemoteElemMutex;
32  RemoteElemMutex remote_elem_mtx;
33 
34 
35  // Class to be dispatched by Singleton::setup()
36  // to create the \p RemoteElem singleton.
37  // While this actual object has file-level static
38  // scope and will be initialized before main(),
39  // importantly the setup() method will not be invoked
40  // until after main().
41  class RemoteElemSetup : public Singleton::Setup
42  {
43  void setup ()
44  {
46  }
47  } remote_elem_setup;
48 }
49 
50 
51 
52 namespace libMesh
53 {
54 
55  // Pointer to singleton Remote Element (to be created in
56  // libMesh::init()
58 
59 
61  {
62  RemoteElemMutex::scoped_lock lock(remote_elem_mtx);
63 
64  remote_elem = NULL;
65  }
66 
67 
68 
70  {
71  if (remote_elem != NULL)
72  return *remote_elem;
73 
74  RemoteElemMutex::scoped_lock lock(remote_elem_mtx);
75 
76  // check again - object could have been created while waiting
77  // for the lock to acquire!
78  if (remote_elem == NULL)
79  remote_elem = new RemoteElem;
80 
81  return *remote_elem;
82  }
83 
84 
85 } // namespace libMesh

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Last modified: February 07 2014 16:57:07 UTC

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