Re: [Boost-users] boost::weak_ptr usage in multithreaded environments

Subject: Re: [Boost-users] boost::weak_ptr usage in multithreaded environments
From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2010-02-01 10:23:28

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On Monday 01 February 2010, Virgil Palanciuc wrote:
> I am assuming in my app. that weak_ptr<>.lock() only requires a "read
> lock", not a "write lock".. is this true?
> I've checked out the page at
> http://www.boost.org/doc/libs/1_41_0/libs/smart_ptr/shared_ptr.htm#ThreadSa
>fety, but there's nothing about weak_ptr there...

Creating and destroying shared_ptr (including those created through 
weak_ptr::lock) doesn't require any locking at all, as far as the reference 
counting goes.  Unless you are trying to simultaneously access the same 
weak_ptr/shared_ptr object (rather than copies pointing at the same thing) 
from different threads?
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