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barrier.h
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1 // The DAGFrameScheduler is a Multi-Threaded lock free and wait free scheduling library.
2 // © Copyright 2010 - 2014 BlackTopp Studios Inc.
3 /* This file is part of The DAGFrameScheduler.
4 
5  The DAGFrameScheduler is free software: you can redistribute it and/or modify
6  it under the terms of the GNU General Public License as published by
7  the Free Software Foundation, either version 3 of the License, or
8  (at your option) any later version.
9 
10  The DAGFrameScheduler is distributed in the hope that it will be useful,
11  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  GNU General Public License for more details.
14 
15  You should have received a copy of the GNU General Public License
16  along with The DAGFrameScheduler. If not, see <http://www.gnu.org/licenses/>.
17 */
18 /* The original authors have included a copy of the license specified above in the
19  'doc' folder. See 'gpl.txt'
20 */
21 /* We welcome the use of the DAGFrameScheduler to anyone, including companies who wish to
22  Build professional software and charge for their product.
23 
24  However there are some practical restrictions, so if your project involves
25  any of the following you should contact us and we will try to work something
26  out:
27  - DRM or Copy Protection of any kind(except Copyrights)
28  - Software Patents You Do Not Wish to Freely License
29  - Any Kind of Linking to Non-GPL licensed Works
30  - Are Currently In Violation of Another Copyright Holder's GPL License
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32  your distribution
33 
34  These and other limitations could cause serious legal problems if you ignore
35  them, so it is best to simply contact us or the Free Software Foundation, if
36  you have any questions.
37 
38  Joseph Toppi - toppij@gmail.com
39  John Blackwood - makoenergy02@gmail.com
40 */
41 #ifndef _barrier_h
42 #define _barrier_h
43 
44 #include "datatypes.h"
45 
46 #if !defined(SWIG) || defined(SWIG_THREADING) // Do not read when in swig and not in the threading module
47 #include "atomicoperations.h"
48 #endif
49 
50 /// @file
51 /// @brief The declaration of the @ref Mezzanine::Threading::Barrier Barrier synchronization primitive
52 
53 namespace Mezzanine
54 {
55  namespace Threading
56  {
57  /// @brief A synchronization primitive that causes a predefined number of threads to all wait before continuing.
59  {
60  protected:
61  /// @brief The number of threads to have wait.
63 
64  /// @brief The number of threads currently waiting.
66 
67  public:
68  /// @brief Constructor
69  /// @param SynchThreadCount The amount of threads that this should wait for. If 0 is passed all threads waiting advance.
70  Barrier (const Int32& SynchThreadCount);
71 
72  /// @brief Wait until the specified number of threads reach this point.
73  /// @return The last thread to reach this point gets true, the others are returned false.
74  bool Wait ();
75 
76  /// @brief Set the Thread count Atomically.
77  /// @param NewCount The new amounf threads to sync.
78  void SetThreadSyncCount(Int32 NewCount);
79 
80  };//Barrier
81  }//Threading
82 }//Mezzanine
83 #endif