Thanks, that makes sense. Ben Hutchings wrote :

James E Taylor wrote:

>I hope this isn't a stupid question, but.... > >Is the boost mutex constructor thread-safe? > > 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.

>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? > >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. > > I don't see that there's any other way to do this using current C++ and Boost.

Ben.

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