Re: [boost] Copyable mutex

From: Michael Caisse (boost_at_[hidden])
Date: 2007-07-20 18:12:55

Phillip Hellewell wrote:
> However, even the simplest _assignable_ class seems almost impossible to me
> to make thread-safe.  You can synchronize operator= using both its own
> mutex(es) and rhs's mutex(es), which seems to solve the problem.  But how do
> you prevent deadlock from something like this?
>
> Thread 1: x = y
> Thread 2: y = x
>   
One common method is to perform the locks based on ordering of the mutex's
memory address. That way all threads are locking and releasing in the same order.

Michael

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Michael Caisse
Object Modeling Designs
www.objectmodelingdesigns.com