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139 lines
3.4 KiB
C++
139 lines
3.4 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 __ZTFASTLOCK_H__
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#define __ZTFASTLOCK_H__
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#include "zthread/NonCopyable.h"
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#include "zthread/Exceptions.h"
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#include <assert.h>
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#include <CoreServices/CoreServices.h>
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//#include <Multiprocessing.h>
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namespace ZThread {
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/**
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* @class FastLock
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*
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* @author Eric Crahen <http://www.code-foo.com>
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* @date <2003-07-16T23:25:31-0400>
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* @version 2.1.6
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*
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*/
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class FastLock : private NonCopyable {
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MPCriticalRegionID _mtx;
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public:
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/**
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* Create a new FastLock. No safety or state checks are performed.
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*
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* @exception Initialization_Exception - not thrown
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*/
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inline FastLock() {
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// Apple TN1071
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static bool init = MPLibraryIsLoaded();
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if(!init || MPCreateCriticalRegion(&_mtx) != noErr) {
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assert(0);
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throw Initialization_Exception();
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}
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}
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/**
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* Destroy a FastLock. No safety or state checks are performed.
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*/
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inline ~FastLock() throw () {
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OSStatus status = MPDeleteCriticalRegion(_mtx);
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if(status != noErr)
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assert(false);
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}
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/**
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* Acquire an exclusive lock. No safety or state checks are performed.
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*
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* @exception Synchronization_Exception - not thrown
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*/
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inline void acquire() {
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if(MPEnterCriticalRegion(_mtx, kDurationForever) != noErr)
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throw Synchronization_Exception();
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}
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/**
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* Try to acquire an exclusive lock. No safety or state checks are performed.
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* This function returns immediately regardless of the value of the timeout
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*
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* @param timeout Unused
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* @return bool
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* @exception Synchronization_Exception - not thrown
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*/
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inline bool tryAcquire(unsigned long timeout=0) {
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OSStatus status =
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MPEnterCriticalRegion(_mtx, kDurationMillisecond * timeout);
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switch(status) {
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case kMPTimeoutErr:
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return false;
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case noErr:
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return true;
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}
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assert(0);
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throw Synchronization_Exception();
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}
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/**
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* Release an exclusive lock. No safety or state checks are performed.
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* The caller should have already acquired the lock, and release it
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* only once.
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*
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* @exception Synchronization_Exception - not thrown
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*/
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inline void release() {
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if(MPExitCriticalRegion(_mtx) != noErr)
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throw Synchronization_Exception();
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}
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}; /* FastLock */
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};
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#endif
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