Re: [Boost-users] shared_ptr race condition

From: Mika Heiskanen (mika.heiskanen_at_[hidden])
Date: 2008-08-16 10:36:58

David Abrahams wrote:
> on Sat Aug 16 2008, "Eduardo Panisset" <eduardo.panisset-AT-gmail.com> wrote:
> 
>>         if( new_use_count == 0 )
>>         {
>>             dispose();
>>             weak_release();
>>         }
>>  
>> How Can I ensure that the release member function wouldn't dispose a pointee
>> more than one time ? (release executing concurrently from different
>> shared_ptr instances) 
> 
> Because the reference count was 1, there can be only one shared_ptr
> instance that owns the pointee.  No other threads can be referencing it.

But since the mutex is released, a copy could be created before the 
new_use_count test is reached? Or is it impossible to create a copy if 
use_count_ is zero?

[Sorry, I didn't take the time to look at the code myself, gotta run.]

--> Mika Heiskanen