Subj : Re: C++ desired features
To   : comp.lang.c++.moderated,comp.programming.threads
From : Sergey P. Derevyago
Date : Fri Feb 25 2005 10:11 pm

Hans Boehm wrote:
>>       Well, what "shared data structures" you're talking about?
>>
> What do typical destructors do?
>
	[snip]
>
> I find it hard to come up with a destructor that is useful and does not
> access any shared data.  (Of course the shared data might be in the
> kernel.)
>
	Do destructors modify some shared data? Yes they do!
	But what does the shared data mean in this context? That's the point!

	A destructor can issue a system call in order to free some  
system-shared
resource. As the result, some system data structures will be  
(asynchronously)
modified according to the request. The point is that it's the system  
which is
obliged to protect the shared data. I.e. the destructor doesn't have to  
lock
the access to this data so this data isn't considered as the shared  
data from
the destructor's point of view.
	I.e. we can definitely assume that the shared data in question is the  
data
that must be protected by locks owned by the application.
--
          With all respect, Sergey.               http://ders.angen.net/
          mailto : ders at skeptik.net

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