Subj : Re: atomic operations api added to AppCore...
To   : comp.programming.threads
From : Ronald Landheer-Cieslak
Date : Fri Feb 25 2005 01:20 pm

awaken wrote:
>>I don't think this would compile if AnchorType >doesn't have a
>>constructor..
> 
> 
> yes it have - I ommited it.
> it's purpose only to initialize this 64bit structure
> 
> 
>>Are you sure you don't need those two bits of >your pointer? Are you
> 
> sure
> 
>>you never forget to mask your pointer so you >take the two bits out and
>>don't use corrupted pointers - ever?
> 
> 
> I'm going to use wrapper class instead raw pointers whenever I can, so it
> will take care about masking/unmasking
> Of couse it's very hardware specific
> It may look like this:
> 
> template <class T> class PackedPtr
> {
>    union
>    {
>       unsigned int dummy_bits:2;
>       unsigned int ptr_:30;
>    };
Shouldn't that be a struct?

> public:
>    PackedPtr(): ptr_(0){};
>    PackedPtr(const T& ptr)
>    { 
>       ptr_ = reinterpret_cast<unsigned int>(&ptr);
>    }
>    PackedPtr(const T* ptr)
>    { 
>       ptr_ = reinterpret_cast<unsigned int>(ptr);
>    }
>    PackedPtr& operator=(const T& ptr)
>    {
>       ptr_ = reinterpret_cast<unsigned int>(ptr);
> 			return ptr_;
>    }
>    T* operator->() const
>    {
>       return reinterpret_cast<T*>(ptr_);
>    }
>    operator T*()
>    {
>       return (reinterpret_cast<T*>(ptr_));
>    }
> };


rlc

.