Re: [boost] library proposal: garbage collection

From: Achilleas Margaritis (axilmar_at_[hidden])
Date: 2006-01-11 10:56:39

"Larry Evans" <cppljevans_at_[hidden]> wrote in message 
news:dq36jf$7c0$1_at_sea.gmane.org...
> On 01/11/2006 08:27 AM, Achilleas Margaritis wrote:
> [snip]
>> -------------------------------------------------------
>> Alternative 1 - using gc_ptr<T> for global, stack and member pointers.
>>
>> It is possible to use the gc_ptr class for global, stack and member
>> pointers. The class would have to check if it belongs in the last-known
>> created object by checking its address against the address of the last
>> created object. If the pointer falls within the memory area of the last
>> created object, then it is a member pointer, otherwise it is a 
>> global/stack
>> pointer. Example code:
>>
>> template < class T > class gc_ptr {
>> public:
>>     gc_ptr() {
>>         if this not within last created object then {
>
> This test, IIUC, requires access to a global object
> (pointer to last created object or something similar).
> Wouldn't this then require synchronization between
> threads; hence, cause a big slowdown for each gc_ptr
> creation?

If the pointer stack is thread-specific storage, then synchronization is not 
be needed.

>
>>            pointer stack->push(this);
>>         }
>>     }
>> };
>>
>
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