forked from boostorg/smart_ptr
98 lines
2.0 KiB
C++
98 lines
2.0 KiB
C++
#ifndef BOOST_DETAIL_ATOMIC_COUNT_WIN32_HPP_INCLUDED
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#define BOOST_DETAIL_ATOMIC_COUNT_WIN32_HPP_INCLUDED
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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//
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// boost/detail/atomic_count_win32.hpp
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//
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// Copyright (c) 2001, 2002, 2003 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifdef BOOST_USE_WINDOWS_H
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# include <windows.h>
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#endif
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namespace boost
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{
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namespace detail
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{
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#ifndef BOOST_USE_WINDOWS_H
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#ifdef _WIN64
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// Intel 6.0 on Win64 version, posted by Tim Fenders to [boost-users]
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extern "C" long_type __cdecl _InterlockedIncrement(long volatile *);
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extern "C" long_type __cdecl _InterlockedDecrement(long volatile *);
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#pragma intrinsic(_InterlockedIncrement)
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#pragma intrinsic(_InterlockedDecrement)
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inline long InterlockedIncrement(long volatile * lp)
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{
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return _InterlockedIncrement(lp);
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}
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inline long InterlockedDecrement(long volatile* lp)
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{
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return _InterlockedDecrement(lp);
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}
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#else // _WIN64
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extern "C" __declspec(dllimport) long __stdcall InterlockedIncrement(long volatile *);
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extern "C" __declspec(dllimport) long __stdcall InterlockedDecrement(long volatile *);
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#endif // _WIN64
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#endif // #ifndef BOOST_USE_WINDOWS_H
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class atomic_count
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{
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public:
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explicit atomic_count(long v): value_(v)
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{
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}
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long operator++()
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{
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// Some older <windows.h> versions do not accept volatile
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return InterlockedIncrement(const_cast<long*>(&value_));
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}
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long operator--()
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{
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return InterlockedDecrement(const_cast<long*>(&value_));
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}
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operator long() const
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{
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return value_;
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}
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private:
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atomic_count(atomic_count const &);
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atomic_count & operator=(atomic_count const &);
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volatile long value_;
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};
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} // namespace detail
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} // namespace boost
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#endif // #ifndef BOOST_DETAIL_ATOMIC_COUNT_WIN32_HPP_INCLUDED
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