2
* Copyright (c) 2005, Eric Crahen
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:
11
* The above copyright notice and this permission notice shall be included in all
12
* copies or substantial portions of the Software.
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.
23
#ifndef __ZTPRIORITYINHERITANCEMUTEX_H__
24
#define __ZTPRIORITYINHERITANCEMUTEX_H__
26
#include "zthread/Lockable.h"
27
#include "zthread/NonCopyable.h"
31
class PriorityInheritanceMutexImpl;
34
* @class PriorityInheritanceMutex
36
* @author Eric Crahen <http://www.code-foo.com>
37
* @date <2003-07-16T19:37:36-0400>
40
* A PriorityInheritanceMutex is similar to a PriorityMutex, it is a non-reentrant,
41
* priority sensitive MUTual EXclusion Lockable object. It differs only in its
48
* Threads competing to acquire() a PriorityInheritanceMutex are granted access in
49
* order of priority. Threads with a higher priority will be given access first.
51
* When a higher priority thread tries to acquire() a PriorityInheritanceMutex and is
52
* about to be blocked by a lower priority thread that has already acquire()d it, the
53
* lower priority thread will temporarily have its effective priority raised to that
54
* of the higher priority thread until it release()s the mutex; at which point its
55
* previous priority will be restored.
57
class ZTHREAD_API PriorityInheritanceMutex : public Lockable, private NonCopyable {
59
PriorityInheritanceMutexImpl* _impl;
66
PriorityInheritanceMutex();
69
* @see Mutex::~Mutex()
71
virtual ~PriorityInheritanceMutex();
74
* @see Mutex::acquire()
76
virtual void acquire();
79
* @see Mutex::tryAcquire(unsigned long timeout)
81
virtual bool tryAcquire(unsigned long timeout);
84
* @see Mutex::release()
86
virtual void release();
91
} // namespace ZThread
93
#endif // __ZTPRIORITYINHERITANCEMUTEX_H__