149 lines
3.8 KiB
C++
149 lines
3.8 KiB
C++
/* -*-c++-*-
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*
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* Copyright (C) 2005-2009,2011 Mathias Froehlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef SGAtomic_HXX
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#define SGAtomic_HXX
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#if defined(__GNUC__) && ((4 < __GNUC__)||(4 == __GNUC__ && 1 <= __GNUC_MINOR__)) && \
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defined(__x86_64__)
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// No need to include something. Is a Compiler API ...
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# define SGATOMIC_USE_GCC4_BUILTINS
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#elif defined(__GNUC__) && defined(__i386__)
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# define SGATOMIC_USE_LIBRARY_FUNCTIONS
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#elif defined(__sgi) && defined(_COMPILER_VERSION) && (_COMPILER_VERSION>=730)
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// No need to include something. Is a Compiler API ...
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# define SGATOMIC_USE_MIPSPRO_BUILTINS
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#elif defined(_WIN32)
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# define SGATOMIC_USE_LIBRARY_FUNCTIONS
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#else
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// The sledge hammer ...
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# define SGATOMIC_USE_LIBRARY_FUNCTIONS
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# define SGATOMIC_USE_MUTEX
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# include <simgear/threads/SGThread.hxx>
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#endif
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class SGAtomic {
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public:
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SGAtomic(unsigned value = 0) : mValue(value)
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{ }
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#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS)
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unsigned operator++();
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#else
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unsigned operator++()
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{
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# if defined(SGATOMIC_USE_GCC4_BUILTINS)
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return __sync_add_and_fetch(&mValue, 1);
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# elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS)
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return __add_and_fetch(&mValue, 1);
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# else
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# error
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# endif
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}
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#endif
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#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS)
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unsigned operator--();
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#else
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unsigned operator--()
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{
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# if defined(SGATOMIC_USE_GCC4_BUILTINS)
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return __sync_sub_and_fetch(&mValue, 1);
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# elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS)
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return __sub_and_fetch(&mValue, 1);
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# else
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# error
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# endif
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}
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#endif
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#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS)
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operator unsigned() const;
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#else
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operator unsigned() const
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{
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# if defined(SGATOMIC_USE_GCC4_BUILTINS)
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__sync_synchronize();
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return mValue;
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# elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS)
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__synchronize();
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return mValue;
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# else
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# error
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# endif
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}
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#endif
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#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS)
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bool compareAndExchange(unsigned oldValue, unsigned newValue);
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#else
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bool compareAndExchange(unsigned oldValue, unsigned newValue)
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{
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# if defined(SGATOMIC_USE_GCC4_BUILTINS)
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return __sync_bool_compare_and_swap(&mValue, oldValue, newValue);
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# elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS)
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return __compare_and_swap(&mValue, oldValue, newValue);
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# else
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# error
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# endif
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}
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#endif
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private:
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SGAtomic(const SGAtomic&);
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SGAtomic& operator=(const SGAtomic&);
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#if defined(SGATOMIC_USE_MUTEX)
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mutable std::mutex mMutex;
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#endif
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unsigned mValue;
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};
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namespace simgear
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{
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// Typesafe wrapper around SGSwappable
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template <typename T>
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class Swappable : private SGAtomic
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{
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public:
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Swappable(const T& value) : SGAtomic(static_cast<unsigned>(value))
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{
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}
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T operator() () const
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{
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return static_cast<T>(SGAtomic::operator unsigned ());
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}
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Swappable& operator=(const Swappable& rhs)
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{
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for (unsigned oldval = unsigned(*this);
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!compareAndExchange(oldval, unsigned(rhs));
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oldval = unsigned(*this))
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;
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return *this;
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}
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bool compareAndSwap(const T& oldVal, const T& newVal)
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{
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return SGAtomic::compareAndExchange(static_cast<unsigned>(oldVal),
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static_cast<unsigned>(newVal));
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}
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};
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}
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#endif
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