Re: [Boost-users] shared_ptr questions

Subject: Re: [Boost-users] shared_ptr questions
From: Roland Bock (rbock_at_[hidden])
Date: 2009-08-18 08:17:23

John Dlugosz wrote:
> I'm looking at shared_ptr and weak_ptr as a TR1 standard approach.  It is hard to follow the implementation, but I'm wondering about some specific issues.
> 
> My set of classes (<http://www.dlugosz.com/Repertoire/refman/Classics/Smart%20Pointers%20Overview.html#toptop>), published over ten years ago, has similar features.  My class "baro" is like your weak_pointer.
> 
> I recall a threading issue where one thread is dropping the last owned reference at the same time another thread is realizing a weak_pointer.  The first decrements the refcount to zero, and the second increments it again.  Is the object destructed?  I'm using a specific mechanism to support this and related features, and I don't see that in your code.
> 
> Is the Boost implementation for Windows (32 and 64-bit) robust and lock-free in cases like this?  How does it work?
> 
> --John

I think this might help:

http://www.boost.org/doc/libs/1_39_0/libs/smart_ptr/shared_ptr.htm#ThreadSafety

It covers shared_ptr only, though.

Regards,

Roland