134 lines
3.1 KiB
C++
Executable File
134 lines
3.1 KiB
C++
Executable File
/**
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* @file llrefcount.h
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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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#ifndef LLREFCOUNT_H
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#define LLREFCOUNT_H
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#include <boost/noncopyable.hpp>
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#include <boost/intrusive_ptr.hpp>
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#include "nd/ndintrin.h" // <FS:ND/> For FAA/FAD
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#define LL_REF_COUNT_DEBUG 0
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#if LL_REF_COUNT_DEBUG
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class LLMutex ;
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#endif
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//----------------------------------------------------------------------------
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// RefCount objects should generally only be accessed by way of LLPointer<>'s
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// see llthread.h for LLThreadSafeRefCount
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//----------------------------------------------------------------------------
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class LL_COMMON_API LLRefCount
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{
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protected:
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LLRefCount(const LLRefCount& other);
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LLRefCount& operator=(const LLRefCount&);
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virtual ~LLRefCount(); // use unref()
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public:
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LLRefCount();
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#if LL_REF_COUNT_DEBUG
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void ref() const ;
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S32 unref() const ;
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#else
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inline void ref() const
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{
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// <FS:ND> Use intrinsic functions for threadsafe increment
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// ++mRef;
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nd::intrin::FAA( &mRef );
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// </FS:ND>
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}
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inline S32 unref() const
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{
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llassert(mRef >= 1);
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// <FS:ND> Use intrinsic functions for threadsafe decrement
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// if (0 == --mRef)
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if (0 == nd::intrin::FAD( &mRef) )
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// </FS:ND>
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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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#endif
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//NOTE: when passing around a const LLRefCount object, this can return different results
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// at different types, since mRef is mutable
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S32 getNumRefs() const
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{
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return mRef;
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}
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private:
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// <FS:ND> Needs to be volatile and U32
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// mutable S32 mRef;
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mutable volatile U32 mRef;
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// </FS:ND>
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#if LL_REF_COUNT_DEBUG
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LLMutex* mMutexp ;
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mutable U32 mLockedThreadID ;
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mutable BOOL mCrashAtUnlock ;
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#endif
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};
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/**
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* intrusive pointer support
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* this allows you to use boost::intrusive_ptr with any LLRefCount-derived type
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*/
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// <FS:ND> intrusive_ptr_add_ref/release are not supposed to be in namespace boost.
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// namespace boost
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// {
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// </FS:ND>
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inline void intrusive_ptr_add_ref(LLRefCount* p)
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{
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p->ref();
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}
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inline void intrusive_ptr_release(LLRefCount* p)
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{
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p->unref();
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}
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// <FS:ND> intrusive_ptr_add_ref/release are not supposed to be in namespace boost.
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// };
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// </FS:ND>
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#endif
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