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Subject: [boost] [uuids] generating uuids from multiple threads
From: Michael Marcin (mike.marcin_at_[hidden])
Date: 2009-01-09 04:48:05

I currently have a shared
boost::uuids::basic_uuid_generator<boost::mt19937> which I protect by a
boost::mutex when I generate a new uuid.

The code looks something like:

std::wstring GetUniqueName()
     boost::uuids::uuid uniqueId;

         boost::mutex::scoped_lock lock( my_mutex );
         uniqueId = my_generator();

     return boost::lexical_cast<std::wstring>( uniqueId );

For one thing this is yet another case where I used a default
constructor on a uuid during natural coding and expected it to be cheap
but I digress.

Do I have to protect the shared generator with a mutex? Should I even be
using a shared generator or should I be constructing it on the stack in
this function? I don't expect this to be called very often (twice total
in our current application) but I want to make sure it is bullet proof
since it can potentially be called concurrently.

Michael Marcin

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