165 lines
3.0 KiB
C++
165 lines
3.0 KiB
C++
/**
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* @file llrefcount.cpp
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* @brief Base class for reference counted objects for use with LLPointer
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*
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* $LicenseInfo:firstyear=2002&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#include "linden_common.h"
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#include "llrefcount.h"
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#include "llerror.h"
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#if LL_REF_COUNT_DEBUG
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#include "llthread.h"
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#include "llapr.h"
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#endif
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LLRefCount::LLRefCount(const LLRefCount& other)
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: mRef(0)
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{
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#if LL_REF_COUNT_DEBUG
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if(gAPRPoolp)
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{
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mMutexp = new LLMutex(gAPRPoolp) ;
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}
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else
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{
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mMutexp = NULL ;
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}
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mCrashAtUnlock = FALSE ;
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#endif
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}
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LLRefCount& LLRefCount::operator=(const LLRefCount&)
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{
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// do nothing, since ref count is specific to *this* reference
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return *this;
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}
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LLRefCount::LLRefCount() :
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mRef(0)
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{
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#if LL_REF_COUNT_DEBUG
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if(gAPRPoolp)
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{
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mMutexp = new LLMutex(gAPRPoolp) ;
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}
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else
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{
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mMutexp = NULL ;
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}
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mCrashAtUnlock = FALSE ;
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#endif
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}
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LLRefCount::~LLRefCount()
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{
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if (mRef != 0)
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{
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llerrs << "deleting non-zero reference" << llendl;
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}
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#if LL_REF_COUNT_DEBUG
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if(gAPRPoolp)
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{
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delete mMutexp ;
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}
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#endif
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}
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#if LL_REF_COUNT_DEBUG
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void LLRefCount::ref() const
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{
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if(mMutexp)
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{
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if(mMutexp->isLocked())
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{
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mCrashAtUnlock = TRUE ;
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llerrs << "the mutex is locked by the thread: " << mLockedThreadID
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<< " Current thread: " << LLThread::currentID() << llendl ;
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}
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mMutexp->lock() ;
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mLockedThreadID = LLThread::currentID() ;
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mRef++;
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if(mCrashAtUnlock)
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{
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while(1); //crash here.
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}
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mMutexp->unlock() ;
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}
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else
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{
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mRef++;
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}
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}
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S32 LLRefCount::unref() const
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{
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if(mMutexp)
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{
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if(mMutexp->isLocked())
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{
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mCrashAtUnlock = TRUE ;
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llerrs << "the mutex is locked by the thread: " << mLockedThreadID
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<< " Current thread: " << LLThread::currentID() << llendl ;
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}
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mMutexp->lock() ;
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mLockedThreadID = LLThread::currentID() ;
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llassert(mRef >= 1);
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if (0 == --mRef)
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{
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if(mCrashAtUnlock)
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{
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while(1); //crash here.
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}
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mMutexp->unlock() ;
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delete this;
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return 0;
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}
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if(mCrashAtUnlock)
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{
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while(1); //crash here.
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}
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mMutexp->unlock() ;
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return mRef;
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}
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else
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{
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llassert(mRef >= 1);
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if (0 == --mRef)
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{
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delete this;
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return 0;
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}
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return mRef;
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}
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}
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#endif
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