Re: [boost] [filesystem] thread safety on msvc 2010

Subject: Re: [boost] [filesystem] thread safety on msvc 2010
From: Beman Dawes (bdawes_at_[hidden])
Date: 2013-01-28 11:05:07

On Sun, Jan 27, 2013 at 7:50 PM, Jacob Schloss
<jacob.schloss_at_[hidden]> wrote:
> Hi,
>
> I've been having some crashes in my code due to concurrent creation of
> boost::filesystem::path objects on several threads.
>
> The issue in short looks like function member static
> variable initialization is not thread safe in msvc 2010, but is in GCC. The
> main issue is with the construction of the std::locale and codecvt objects,
> I get crashes when some threads try to use a partially constructed instance
> of std::locale.
>
> I posted some details of my issue and possible fix at the end of bug 6320
> https://svn.boost.org/trac/boost/ticket/6320, and would like to clean it up
> into a patch for consideration. Right now, I was looking at using
> boost::thread call_once to synchronize the std::locale and
> codecvt initialization code. I'm running locally with a
> boost::thread::call_once patch, and it seems to work for some simple test
> cases.

Some critical points to getting a patch accepted are that it applies
only to the affected platform (i.e. Windows) and that it includes test
cases that fail with the current code but pass with the patch applied.
If it works for you with msvc 2010, I can test with other versions and
compilers.

Thanks,

--Beman