root/trunk/dep/src/zthread/win32/FastRecursiveLock.h @ 2

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Original author: Neo2003
Date: 2008-10-02 16:23:55-05:00
Line 
1/*
2 * Copyright (c) 2005, Eric Crahen
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is furnished
9 * to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in all
12 * copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
18 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20 *
21 */
22
23#ifndef __ZTFASTRECURSIVELOCK_H__
24#define __ZTFASTRECURSIVELOCK_H__
25
26#include "zthread/Exceptions.h"
27#include "zthread/NonCopyable.h"
28#include <windows.h>
29#include <assert.h>
30
31namespace ZThread {
32
33
34/**
35 * @class FastRecursiveLock
36 *
37 * @author Eric Crahen <http://www.code-foo.com>
38 * @date <2003-07-16T23:32:56-0400>
39 * @version 2.2.11
40 *
41 * This FastRecursiveLock implementation is based on a Win32 Mutex
42 * object. This will perform better under high contention,
43 * but will not be as fast as the spin lock under reasonable
44 * circumstances.
45 */ 
46class FastRecursiveLock : private NonCopyable {
47
48  HANDLE _hMutex;
49  volatile unsigned int _count;
50
51  public:
52 
53  /**
54   * Create a new FastRecursiveLock
55   */
56  FastRecursiveLock() : _count(0) { 
57
58    _hMutex = ::CreateMutex(0, 0, 0);
59    assert(_hMutex != NULL);
60    if(_hMutex == NULL)
61      throw Initialization_Exception();
62
63  }
64
65 
66  ~FastRecursiveLock() {
67    ::CloseHandle(_hMutex);
68  }
69
70 
71  void acquire() {
72
73    if(::WaitForSingleObject(_hMutex, INFINITE) != WAIT_OBJECT_0) {
74      assert(0);
75      throw Synchronization_Exception();
76    }
77
78  }
79
80  void release() {
81
82    if(::ReleaseMutex(_hMutex) == 0) {
83      assert(0);
84      throw Synchronization_Exception();
85    }
86
87  }
88
89  bool tryAcquire(unsigned long) {
90
91    switch(::WaitForSingleObject(_hMutex, 0)) {
92      case WAIT_OBJECT_0:
93        return true;
94      case WAIT_TIMEOUT:
95        return false;
96      default:
97        break;
98    }
99
100    assert(0);
101    throw Synchronization_Exception();
102
103  }
104
105}; /* FastRecursiveLock */
106
107} // namespace ZThread
108
109#endif
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