CWE-ou-minkata/MOULOpenSourceClientPlugin/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtRef.h

/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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(at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
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PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
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*==LICENSE==*/
/*****************************************************************************
*
*   $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtRef.h
*   
***/

#ifdef PLASMA20_SOURCES_PLASMA_NUCLEUSLIB_PNUTILS_PRIVATE_PNUTREF_H
#error "Header $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtRef.h included more than once"
#endif
#define PLASMA20_SOURCES_PLASMA_NUCLEUSLIB_PNUTILS_PRIVATE_PNUTREF_H


/*****************************************************************************
*
*   Debug macros
*
***/

#ifdef REFCOUNT_DEBUGGING
    #define REFTRACE    DEBUG_MSG
#else
    #define REFTRACE    NULL_STMT
#endif


/****************************************************************************
*
*   AtomicRef
*   Thread safe reference count
*
***/

class AtomicRef {
#ifdef HS_DEBUGGING
	bool	zeroed;
#endif
public:
    inline AtomicRef ()
    : m_ref(0)
    #ifdef HS_DEBUGGING
    , zeroed(false)
    #endif
    {}
    
    inline void AcknowledgeZeroRef () {
		#ifdef HS_DEBUGGING
		zeroed = false;
		#endif
	}

    inline long IncRef () {
		#ifdef HS_DEBUGGING
		ASSERT(!zeroed);
		#endif
        long prev = AtomicAdd(&m_ref, 1);
        REFTRACE("Inc %p: %u", this, prev+1);
        return prev+1;
    }
    inline long IncRef (const char tag[]) {
		#ifdef HS_DEBUGGING
		ASSERT(!zeroed);
		#endif
        long prev = AtomicAdd(&m_ref, 1);
        REF(tag);
        REFTRACE("Inc %p %s: %u", this, tag, prev+1);
        return prev+1;
    }
    inline long IncRef (unsigned n) {
		#ifdef HS_DEBUGGING
		ASSERT(!zeroed);
		#endif
        long prev = AtomicAdd(&m_ref, n);
        REFTRACE("Inc %p: %u", this, prev+n);
        return prev+n;
    }
    inline long IncRef (unsigned n, const char tag[]) {
		#ifdef HS_DEBUGGING
		ASSERT(!zeroed);
		#endif
        long prev = AtomicAdd(&m_ref, n);
        REF(tag);
        REFTRACE("Inc %p %s: %u", this, tag, prev+n);
        return prev+n;
    }

    inline long DecRef () {
		#ifdef HS_DEBUGGING
		ASSERT(!zeroed);
		#endif
		long prev;
        if ((prev = AtomicAdd(&m_ref, -1)) == 1) {
			#ifdef HS_DEBUGGING
			zeroed = true;
			#endif
            OnZeroRef();
        }
        REFTRACE("Dec %p: %u", this, prev-1);
        return prev-1;
    }
    inline long DecRef (const char tag[]) {
		#ifdef HS_DEBUGGING
		ASSERT(!zeroed);
		#endif
		long prev;
        if ((prev = AtomicAdd(&m_ref, -1)) == 1) {
			#ifdef HS_DEBUGGING
			zeroed = true;
			#endif
            OnZeroRef();
        }
        REF(tag);
        REFTRACE("Dec %p %s: %u", this, tag, prev-1);
        return prev-1;
    }

    inline void TransferRef (
        const char oldTag[],
        const char newTag[]
    ) {
		#ifdef HS_DEBUGGING
		ASSERT(!zeroed);
		#endif
        REF(oldTag);
        REF(newTag);
        REFTRACE("Inc %p %s: (xfer)", this, newTag);
        REFTRACE("Dec %p %s: (xfer)", this, oldTag);
    }

    inline unsigned GetRefCount () {
        return m_ref;
    }

    inline virtual void OnZeroRef () {
        DEL(this);
    }

protected:
    inline virtual ~AtomicRef () {
        ASSERT(!m_ref);
    }

private:
    long    m_ref;
};