root/trunk/dep/src/zthread/PriorityInheritanceMutex.cxx @ 2

Revision 2, 2.5 kB (checked in by yumileroy, 17 years ago)

[svn] * Proper SVN structure

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#include "zthread/PriorityInheritanceMutex.h"
24#include "MutexImpl.h"
25#include "ThreadOps.h"
26
27
28namespace ZThread {
29
30  class InheritPriorityBehavior : public NullBehavior {
31 
32    ThreadImpl* owner;
33    Priority p;
34
35  protected:
36
37    // Temporarily raise the effective priority of the owner
38    inline void waiterArrived(ThreadImpl* impl) { 
39   
40      Priority q = impl->getPriority();
41      if((int)q > (int)p) {
42
43        ThreadOps::setPriority(impl, p);
44        p = q;
45     
46      }
47
48    }
49
50
51    // Note the owners priority
52    inline void ownerAcquired(ThreadImpl* impl) { 
53
54      p = impl->getPriority();
55      owner = impl;
56
57    }
58
59    // Restore its original priority
60    inline void ownerReleased(ThreadImpl* impl) { 
61
62      if(p > owner->getPriority())
63        ThreadOps::setPriority(impl, impl->getPriority());
64
65    }
66
67  };
68
69  class PriorityInheritanceMutexImpl :
70    public MutexImpl<priority_list, InheritPriorityBehavior> { };
71
72  PriorityInheritanceMutex::PriorityInheritanceMutex() {
73 
74    _impl = new PriorityInheritanceMutexImpl();
75 
76  }
77
78  PriorityInheritanceMutex::~PriorityInheritanceMutex() {
79
80    if(_impl != 0)
81      delete _impl;
82
83  }
84
85  // P
86  void PriorityInheritanceMutex::acquire() {
87
88    _impl->acquire();
89
90  }
91
92
93  // P
94  bool PriorityInheritanceMutex::tryAcquire(unsigned long ms) {
95
96    return _impl->tryAcquire(ms);
97
98  }
99
100  // V
101  void PriorityInheritanceMutex::release() {
102
103    _impl->release();
104
105  }
106
107
108} // namespace ZThread
109
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