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113 lines
2.9 KiB
113 lines
2.9 KiB
// Module: Log4CPLUS
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// File: pointer.cxx
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// Created: 6/2001
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// Author: Tad E. Smith
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//
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//
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// Copyright 2001-2010 Tad E. Smith
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <log4cplus/streams.h>
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#include <log4cplus/helpers/pointer.h>
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#include <log4cplus/thread/threads.h>
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#include <log4cplus/thread/impl/syncprims-impl.h>
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#include <log4cplus/config/windowsh-inc.h>
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#include <cassert>
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#if defined (LOG4CPLUS_HAVE_INTRIN_H)
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#include <intrin.h>
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#endif
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namespace log4cplus { namespace helpers {
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///////////////////////////////////////////////////////////////////////////////
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// log4cplus::helpers::SharedObject dtor
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///////////////////////////////////////////////////////////////////////////////
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SharedObject::~SharedObject()
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{
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assert(count == 0);
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}
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///////////////////////////////////////////////////////////////////////////////
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// log4cplus::helpers::SharedObject public methods
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///////////////////////////////////////////////////////////////////////////////
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void
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SharedObject::addReference() const
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{
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#if defined (LOG4CPLUS_SINGLE_THREADED)
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++count;
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#elif defined (LOG4CPLUS_HAVE_CXX11_ATOMICS)
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std::atomic_fetch_add_explicit (&count, 1u,
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std::memory_order_relaxed);
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#elif defined (LOG4CPLUS_HAVE___SYNC_ADD_AND_FETCH)
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__sync_add_and_fetch (&count, 1);
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#elif defined (_WIN32) && defined (LOG4CPLUS_HAVE_INTRIN_H)
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_InterlockedIncrement (&count);
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#elif defined (_WIN32)
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InterlockedIncrement (&count);
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#else
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thread::MutexGuard guard (access_mutex);
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++count;
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#endif
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}
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void
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SharedObject::removeReference() const
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{
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assert (count > 0);
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bool destroy;
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#if defined (LOG4CPLUS_SINGLE_THREADED)
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destroy = --count == 0;
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#elif defined (LOG4CPLUS_HAVE_CXX11_ATOMICS)
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destroy = std::atomic_fetch_sub_explicit (&count, 1u,
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std::memory_order_release) == 1;
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if (LOG4CPLUS_UNLIKELY (destroy))
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std::atomic_thread_fence (std::memory_order_acquire);
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#elif defined (LOG4CPLUS_HAVE___SYNC_SUB_AND_FETCH)
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destroy = __sync_sub_and_fetch (&count, 1) == 0;
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#elif defined (_WIN32) && defined (LOG4CPLUS_HAVE_INTRIN_H)
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destroy = _InterlockedDecrement (&count) == 0;
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#elif defined (_WIN32)
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destroy = InterlockedDecrement (&count) == 0;
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#else
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{
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thread::MutexGuard guard (access_mutex);
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destroy = --count == 0;
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}
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#endif
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if (LOG4CPLUS_UNLIKELY (destroy))
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delete this;
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}
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} } // namespace log4cplus { namespace helpers
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