Semaphore.h
1 /*
2  * Copyright (C) 2005-2013 by Marc Boris Duerner
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  * As a special exception, you may use this file as part of a free
10  * software library without restriction. Specifically, if other files
11  * instantiate templates or use macros or inline functions from this
12  * file, or you compile this file and link it with other files to
13  * produce an executable, this file does not by itself cause the
14  * resulting executable to be covered by the GNU General Public
15  * License. This exception does not however invalidate any other
16  * reasons why the executable file might be covered by the GNU Library
17  * General Public License.
18  *
19  * This library is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22  * Lesser General Public License for more details.
23  *
24  * You should have received a copy of the GNU Lesser General Public
25  * License along with this library; if not, write to the Free Software
26  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27  */
28 
29 #ifndef Pt_Semaphore_h
30 #define Pt_Semaphore_h
31 
32 #include <Pt/System/Api.h>
33 #include <Pt/NonCopyable.h>
34 
35 namespace Pt {
36 
37 namespace System {
38 
41 class PT_SYSTEM_API Semaphore : private NonCopyable
42 {
43  friend class SemaphoreImpl;
44 
45  public:
47  Semaphore(unsigned int initial = 0);
48 
50  ~Semaphore();
51 
53  Semaphore& wait();
54 
56  bool tryWait();
57 
59  Semaphore& post();
60 
61  private:
63  class SemaphoreImpl* _impl;
64 };
65 
66 } // namespace System
67 
68 } // namespace Pt
69 
70 #endif // Pt_Semaphore_h
Protects derived classes from being copied.
Definition: NonCopyable.h:54
Semaphore synchronization object.
Definition: Semaphore.h:41