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From: Ben Hutchings (ben.hutchings_at_[hidden])
Date: 2005-08-18 07:35:03

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


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