Re: [boost] Copyable mutex

From: Phillip Hellewell (sshock_at_[hidden])
Date: 2007-07-20 19:22:12

On 7/20/07, Peter Dimov <pdimov_at_[hidden]> wrote:
>
> The classic solution is to lock the mutexes in ascending order of their
> addresses, but I prefer
>
> X& X::operator=( X const& rhs )
> {
>     X tmp( rhs ); // temporarily locks rhs.mutex
>
>     scoped_lock lock( this->mutex );
>     swap( tmp ); // or move_from( tmp )
>
>     return *this;
> }
>
> It's always a good idea to only lock one mutex at a time if you can afford
> it.
>

Very nice!  Thanks Michael and Peter.  I especially liked your last
solution.  I guess that shows how an efficient swap function can really come
in handy.

Phillip