safeflag.h

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#pragma once
//------------------------------------------------------------------------------
#include "threading/interlocked.h"
 
//------------------------------------------------------------------------------
namespace Threading
{
class SafeFlag
{
public:
    SafeFlag();
    void Set();
    void Clear();
    bool Test() const;
    bool TestAndClearIfSet();
 
private:
    int volatile flag;
};
 
//------------------------------------------------------------------------------
inline
SafeFlag::SafeFlag() :
    flag(0)
{
    // empty
}
 
//------------------------------------------------------------------------------
inline void
SafeFlag::Set()
{
    Interlocked::Exchange(&this->flag, 1);
}
 
//------------------------------------------------------------------------------
inline void
SafeFlag::Clear()
{
    Interlocked::Exchange(&this->flag, 0);
}
 
//------------------------------------------------------------------------------
inline bool
SafeFlag::Test() const
{
    return (0 != this->flag);
}
 
//------------------------------------------------------------------------------
inline bool
SafeFlag::TestAndClearIfSet()
{
    return (1 == Interlocked::CompareExchange(&this->flag, 0, 1));
}
 
} // namespace Threading
//------------------------------------------------------------------------------