ClanLib  2.3.7
mutex.h
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1 /*
2 ** ClanLib SDK
3 ** Copyright (c) 1997-2011 The ClanLib Team
4 **
5 ** This software is provided 'as-is', without any express or implied
6 ** warranty. In no event will the authors be held liable for any damages
7 ** arising from the use of this software.
8 **
9 ** Permission is granted to anyone to use this software for any purpose,
10 ** including commercial applications, and to alter it and redistribute it
11 ** freely, subject to the following restrictions:
12 **
13 ** 1. The origin of this software must not be misrepresented; you must not
14 ** claim that you wrote the original software. If you use this software
15 ** in a product, an acknowledgment in the product documentation would be
16 ** appreciated but is not required.
17 ** 2. Altered source versions must be plainly marked as such, and must not be
18 ** misrepresented as being the original software.
19 ** 3. This notice may not be removed or altered from any source distribution.
20 **
21 ** Note: Some of the libraries ClanLib may link to may have additional
22 ** requirements or restrictions.
23 **
24 ** File Author(s):
25 **
26 ** Magnus Norddahl
27 */
28 
31 
32 
33 #pragma once
34 
35 
36 #include "../api_core.h"
37 
38 #ifdef WIN32
39 #include <windows.h>
40 #else
41 #ifndef __USE_UNIX98
42 #define __USE_UNIX98
43 #endif
44 #include <pthread.h>
45 #endif
46 
51 {
54 
55 public:
57  CL_Mutex();
58 
59  ~CL_Mutex();
60 
61 
65 
66 public:
67 
68 
72 
73 public:
75  void lock();
76 
78  bool try_lock();
79 
81  void unlock();
82 
83 
87 
88 private:
89 #ifdef WIN32
90  CRITICAL_SECTION critical_section;
91 #else
92  pthread_mutex_t handle;
93 #endif
94 };
96 
101 {
104 
105 public:
107  CL_MutexSection(CL_Mutex *mutex, bool lock_mutex = true)
108  : mutex(mutex), lock_count(0)
109  {
110  if (lock_mutex)
111  lock();
112  }
113 
115  {
116  if (lock_count > 0 && mutex)
117  mutex->unlock();
118  lock_count = 0;
119  }
120 
121 
125 
126 public:
128  int get_lock_count() const
129  {
130  return lock_count;
131  }
132 
133 
137 
138 public:
140  void lock()
141  {
142  if (mutex)
143  mutex->lock();
144  lock_count++;
145  }
146 
148  bool try_lock()
149  {
150  if (mutex == 0 || mutex->try_lock())
151  {
152  lock_count++;
153  return true;
154  }
155  return false;
156  }
157 
159  void unlock()
160  {
161  if (lock_count <= 0)
162  return;
163 
164  if (mutex)
165  mutex->unlock();
166  lock_count--;
167  }
168 
169 
173 
174 private:
175  CL_Mutex *mutex;
176 
177  int lock_count;
179 };
180 
181