// Module:  Log4CPLUS

// File:    pointer.cxx

// Created: 6/2001

// Author:  Tad E. Smith

//

//

// Copyright 2001-2017 Tad E. Smith

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include <log4cplus/streams.h>

#include <log4cplus/helpers/pointer.h>

#include <log4cplus/thread/threads.h>

#include <log4cplus/thread/impl/syncprims-impl.h>

#include <cassert>

namespace log4cplus { namespace helpers {

///////////////////////////////////////////////////////////////////////////////

// log4cplus::helpers::SharedObject dtor

///////////////////////////////////////////////////////////////////////////////

SharedObject::~SharedObject()

{

    assert(count__ == 0);

}

///////////////////////////////////////////////////////////////////////////////

// log4cplus::helpers::SharedObject public methods

///////////////////////////////////////////////////////////////////////////////

void

SharedObject::addReference() const LOG4CPLUS_NOEXCEPT

{

#if defined (LOG4CPLUS_SINGLE_THREADED)

    ++count__;

#else

    std::atomic_fetch_add_explicit (&count__, 1u,

        std::memory_order_relaxed);

#endif

}

void

SharedObject::removeReference() const

{

    assert (count__ > 0);

    bool destroy;

#if defined (LOG4CPLUS_SINGLE_THREADED)

    destroy = --count__ == 0;

#else

    destroy = std::atomic_fetch_sub_explicit (&count__, 1u,

        std::memory_order_release) == 1;

    if (LOG4CPLUS_UNLIKELY (destroy))

        std::atomic_thread_fence (std::memory_order_acquire);

#endif

    if (LOG4CPLUS_UNLIKELY (destroy))

        delete this;

}

} } // namespace log4cplus { namespace helpers