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