102 lines
3.2 KiB
C++
102 lines
3.2 KiB
C++
/***************************************************************************
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copyright : (C) 2013 by Tsuda Kageyu
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email : tsuda.kageyu@gmail.com
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***************************************************************************/
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/***************************************************************************
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License version *
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* 2.1 as published by the Free Software Foundation. *
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* *
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* This library is distributed in the hope that it will be useful, but *
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* 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 *
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* 02110-1301 USA *
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* *
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* Alternatively, this file is available under the Mozilla Public *
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* License Version 1.1. You may obtain a copy of the License at *
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* http://www.mozilla.org/MPL/ *
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***************************************************************************/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "trefcounter.h"
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#if defined(HAVE_STD_ATOMIC)
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# include <atomic>
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# define ATOMIC_INT std::atomic_int
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# define ATOMIC_INC(x) (++x)
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# define ATOMIC_DEC(x) (--x)
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#elif defined(HAVE_GCC_ATOMIC)
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# define ATOMIC_INT int
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# define ATOMIC_INC(x) __sync_add_and_fetch(&x, 1)
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# define ATOMIC_DEC(x) __sync_sub_and_fetch(&x, 1)
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#elif defined(HAVE_WIN_ATOMIC)
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# if !defined(NOMINMAX)
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# define NOMINMAX
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# endif
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# include <windows.h>
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# define ATOMIC_INT long
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# define ATOMIC_INC(x) InterlockedIncrement(&x)
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# define ATOMIC_DEC(x) InterlockedDecrement(&x)
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#elif defined(HAVE_MAC_ATOMIC)
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# include <libkern/OSAtomic.h>
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# define ATOMIC_INT int32_t
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# define ATOMIC_INC(x) OSAtomicIncrement32Barrier(&x)
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# define ATOMIC_DEC(x) OSAtomicDecrement32Barrier(&x)
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#elif defined(HAVE_IA64_ATOMIC)
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# include <ia64intrin.h>
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# define ATOMIC_INT int
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# define ATOMIC_INC(x) __sync_add_and_fetch(&x, 1)
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# define ATOMIC_DEC(x) __sync_sub_and_fetch(&x, 1)
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#else
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# define ATOMIC_INT int
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# define ATOMIC_INC(x) (++x)
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# define ATOMIC_DEC(x) (--x)
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#endif
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namespace TagLib
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{
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class RefCounter::RefCounterPrivate
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{
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public:
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RefCounterPrivate() :
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refCount(1) {}
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volatile ATOMIC_INT refCount;
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};
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RefCounter::RefCounter() :
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d(new RefCounterPrivate())
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{
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}
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RefCounter::~RefCounter()
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{
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delete d;
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}
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void RefCounter::ref()
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{
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ATOMIC_INC(d->refCount);
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}
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bool RefCounter::deref()
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{
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return (ATOMIC_DEC(d->refCount) == 0);
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}
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int RefCounter::count() const
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{
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return static_cast<int>(d->refCount);
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}
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}
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