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111 lines
3.8 KiB
C++
111 lines
3.8 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 __ZTFASTMUTEX_H__
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#define __ZTFASTMUTEX_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 FastLock;
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/**
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* @class FastMutex
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* @author Eric Crahen <http://www.code-foo.com>
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* @date <2003-07-19T18:45:39-0400>
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* @version 2.2.0
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*
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* A FastMutex is a small fast implementation of a non-recursive, mutually exclusive
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* Lockable object. This implementation is a bit faster than the other Mutex classes
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* as it involved the least overhead. However, this slight increase in speed is
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* gained by sacrificing the robustness provided by the other classes.
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*
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* A FastMutex has the useful property of not being interruptable; that is to say
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* that acquire() and tryAcquire() will not throw Interrupted_Exceptions.
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*
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* @see Mutex
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*
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* <b>Scheduling</b>
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*
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* Scheduling is left to the operating systems and may vary.
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*
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* <b>Error Checking</b>
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*
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* No error checking is performed, this means there is the potential for deadlock.
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*/
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class ZTHREAD_API FastMutex : public Lockable, private NonCopyable {
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FastLock* _lock;
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public:
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//! Create a FastMutex
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FastMutex();
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//! Destroy a FastMutex
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virtual ~FastMutex();
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/**
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* Acquire exclusive access to the mutex. The calling thread will block until the
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* lock can be acquired. No safety or state checks are performed.
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*
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* @pre The calling thread should <i>not</i> have previously acquired this lock.
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* Deadlock will result if the same thread attempts to acquire the mutex more
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* than once.
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*
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* @post The calling thread obtains the lock successfully if no exception is thrown.
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* @exception Interrupted_Exception never thrown
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*/
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virtual void acquire();
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/**
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* Release exclusive access. No safety or state checks are performed.
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*
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* @pre the caller should have previously acquired this lock
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*/
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virtual void release();
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/**
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* Try to acquire exclusive access to the mutex. The calling thread will block until the
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* lock can be acquired. No safety or state checks are performed.
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*
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* @pre The calling thread should <i>not</i> have previously acquired this lock.
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* Deadlock will result if the same thread attempts to acquire the mutex more
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* than once.
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*
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* @param timeout unused
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* @return
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* - <em>true</em> if the lock was acquired
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* - <em>false</em> if the lock was acquired
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*
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* @post The calling thread obtains the lock successfully if no exception is thrown.
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* @exception Interrupted_Exception never thrown
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*/
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virtual bool tryAcquire(unsigned long timeout);
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}; /* FastMutex */
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};
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#endif // __ZTFASTMUTEX_H__
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