114 lines
3.9 KiB
C++
114 lines
3.9 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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#ifndef TAGLIB_REFCOUNTER_H
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#define TAGLIB_REFCOUNTER_H
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#include "taglib_export.h"
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#include "taglib.h"
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#ifdef __APPLE__
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# include <atomic>
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# define TAGLIB_ATOMIC_MAC
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#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
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# ifndef NOMINMAX
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# define NOMINMAX
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# endif
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# include <windows.h>
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# define TAGLIB_ATOMIC_WIN
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#elif defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 401) \
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&& (defined(__i386__) || defined(__i486__) || defined(__i586__) || \
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defined(__i686__) || defined(__x86_64) || defined(__ia64)) \
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&& !defined(__INTEL_COMPILER)
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# define TAGLIB_ATOMIC_GCC
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#elif defined(__ia64) && defined(__INTEL_COMPILER)
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# include <ia64intrin.h>
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# define TAGLIB_ATOMIC_GCC
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#endif
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#ifndef DO_NOT_DOCUMENT // Tell Doxygen to skip this class.
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/*!
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* \internal
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* This is just used as a base class for shared classes in TagLib.
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*
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* \warning This <b>is not</b> part of the TagLib public API!
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*/
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namespace TagLib
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{
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class TAGLIB_EXPORT RefCounter
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{
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public:
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RefCounter();
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virtual ~RefCounter();
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void ref();
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bool deref();
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int count() const;
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private:
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class RefCounterPrivate;
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RefCounterPrivate *d;
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};
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// BIC this old class is needed by tlist.tcc and tmap.tcc
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class RefCounterOld
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{
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public:
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RefCounterOld() : refCount(1) {}
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#ifdef TAGLIB_ATOMIC_MAC
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void ref() { atomic_fetch_add(&refCount, 1); }
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bool deref() { return atomic_fetch_sub(&refCount, 1) == 1; }
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int32_t count() { return atomic_load(&refCount); }
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private:
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std::atomic<int32_t> refCount;
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#elif defined(TAGLIB_ATOMIC_WIN)
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void ref() { InterlockedIncrement(&refCount); }
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bool deref() { return ! InterlockedDecrement(&refCount); }
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long count() { return refCount; }
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private:
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volatile long refCount;
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#elif defined(TAGLIB_ATOMIC_GCC)
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void ref() { __sync_add_and_fetch(&refCount, 1); }
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bool deref() { return ! __sync_sub_and_fetch(&refCount, 1); }
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int count() { return refCount; }
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private:
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volatile int refCount;
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#else
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void ref() { refCount++; }
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bool deref() { return ! --refCount; }
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int count() { return refCount; }
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private:
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unsigned int refCount;
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#endif
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};
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}
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#endif // DO_NOT_DOCUMENT
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#endif
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