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93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
/*
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* Copyright (c) 2005, Eric Crahen
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is furnished
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* to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#ifndef __ZTPRIORITYINHERITANCEMUTEX_H__
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#define __ZTPRIORITYINHERITANCEMUTEX_H__
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#include "zthread/Lockable.h"
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#include "zthread/NonCopyable.h"
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namespace ZThread {
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class PriorityInheritanceMutexImpl;
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/**
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* @class PriorityInheritanceMutex
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*
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* @author Eric Crahen <http://www.code-foo.com>
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* @date <2003-07-16T19:37:36-0400>
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* @version 2.2.1
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*
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* A PriorityInheritanceMutex is similar to a PriorityMutex, it is a non-reentrant,
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* priority sensitive MUTual EXclusion Lockable object. It differs only in its
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* scheduling policy.
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*
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* @see PriorityMutex
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*
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* <b>Scheduling</b>
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*
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* Threads competing to acquire() a PriorityInheritanceMutex are granted access in
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* order of priority. Threads with a higher priority will be given access first.
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*
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* When a higher priority thread tries to acquire() a PriorityInheritanceMutex and is
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* about to be blocked by a lower priority thread that has already acquire()d it, the
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* lower priority thread will temporarily have its effective priority raised to that
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* of the higher priority thread until it release()s the mutex; at which point its
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* previous priority will be restored.
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*/
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class ZTHREAD_API PriorityInheritanceMutex : public Lockable, private NonCopyable {
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PriorityInheritanceMutexImpl* _impl;
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public:
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/**
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* @see Mutex::Mutex()
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*/
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PriorityInheritanceMutex();
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/**
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* @see Mutex::~Mutex()
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*/
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virtual ~PriorityInheritanceMutex();
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/**
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* @see Mutex::acquire()
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*/
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virtual void acquire();
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/**
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* @see Mutex::tryAcquire(unsigned long timeout)
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*/
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virtual bool tryAcquire(unsigned long timeout);
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/**
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* @see Mutex::release()
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*/
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virtual void release();
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};
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} // namespace ZThread
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#endif // __ZTPRIORITYINHERITANCEMUTEX_H__
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