98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
#pragma once
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/****************************************************************************
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Copyright (c) 2008, Radon Labs GmbH
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Copyright (c) 2011-2013,WebJet Business Division,CYOU
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http://www.genesis-3d.com.cn
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#include "threading/interlocked.h"
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//------------------------------------------------------------------------------
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namespace Threading
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{
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class SafeFlag
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{
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public:
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/// constructor
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SafeFlag();
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/// set the flag
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void Set();
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/// clear the flag
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void Clear();
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/// test if the flag is set
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bool Test() const;
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/// test if flag is set, if yes, clear flag
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bool TestAndClearIfSet();
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private:
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int volatile flag;
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};
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//------------------------------------------------------------------------------
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/**
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*/
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inline
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SafeFlag::SafeFlag() :
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flag(0)
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{
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// empty
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}
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//------------------------------------------------------------------------------
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/**
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*/
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inline void
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SafeFlag::Set()
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{
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Interlocked::Exchange(&this->flag, 1);
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}
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//------------------------------------------------------------------------------
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/**
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*/
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inline void
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SafeFlag::Clear()
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{
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Interlocked::Exchange(&this->flag, 0);
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}
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//------------------------------------------------------------------------------
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/**
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*/
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inline bool
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SafeFlag::Test() const
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{
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return (0 != this->flag);
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}
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//------------------------------------------------------------------------------
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/**
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*/
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inline bool
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SafeFlag::TestAndClearIfSet()
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{
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return (1 == Interlocked::CompareExchange(&this->flag, 0, 1));
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}
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} // namespace Threading
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//------------------------------------------------------------------------------
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