Re: [Boost-users] thread safety of the mutex ctor

From: James E Taylor (james_at_[hidden])
Date: 2005-08-18 08:07:07

Thanks, that makes sense.

Ben Hutchings <ben.hutchings_at_[hidden]> wrote :

> James E Taylor wrote:
> 
> &gt;I hope this isn't a stupid question, but....
> &gt;
> &gt;Is the boost mutex constructor thread-safe?
> &gt;  
> &gt;
> Clearly it's unsafe for multiple threads to call a constructor on the 
> same block of memory concurrently. To answer the real question, dynamic 
> initialisation of local static variables is generally not thread-safe.
> 
> &gt;and my worry is that both threads could attempt to do the static
> initialisation of m concurrently.  Is there protection against this?  Is it
> even possible to protect against this?
> &gt;
> &gt;I've tried to use boost::call_once, which would give sufficient guarantees
> but it's quite inflexible as nothing can be passed to or from the function
> being called.
> &gt;  
> &gt;
> I don't see that there's any other way to do this using current C++ and 
> Boost.
> 
> Ben.
> 
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-- 
James E Taylor
james_at_[hidden]
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