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