semaphore.h
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1 /*
2  * Copyright (C) 2005 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 #ifndef cxxtools_Semaphore_h
29 #define cxxtools_Semaphore_h
30 
31 #include <cxxtools/api.h>
32 #include <cxxtools/noncopyable.h>
33 
34 namespace cxxtools {
35 
37 {
38  friend class SemaphoreImpl;
39 
40  public:
42  Semaphore(unsigned int initial = 0);
43 
45  ~Semaphore();
46 
48  Semaphore& wait();
49 
51  bool tryWait();
52 
54  Semaphore& post();
55 
56  private:
58  class SemaphoreImpl* _impl;
59 };
60 
61 } // !namespace cxxtools
62 
63 #endif