Re: [Boost-users] [thread] C++/CLI C# mixed code: linking to libthread yields runtime exception

Subject: Re: [Boost-users] [thread] C++/CLI C# mixed code: linking to libthread yields runtime exception
From: Anthony Williams (anthony.ajw_at_[hidden])
Date: 2009-02-04 11:59:13

Markus Werle <numerical.simulation_at_[hidden]> writes:

> Anthony Williams <anthony.ajw <at> gmail.com> writes:
>
>> The problem is that the static boost thread library tries to hook the
>> native win32 PE TLS callbacks in order to ensure that the thread-local
>> data used by boost thread is cleaned up correctly. This is not
>> compatible with a C++/CLI executable.
>
> So the auto-link feature should be switched off in C++/CLI, right?

Maybe. Alternatively, it should force the use of the thread DLL rather
than static lib.

>> Your workaround explicitly omits the automatic TLS cleanup (and declares
>> that you're doing it yourself by calling on_thread_exit at the
>> appropriate time). 
>
> I am lost here.

Boost.Thread uses some TLS variables for things like the current thread
ID, interruption handles and so forth. In order to ensure that these
things are correctly freed when a thread exits, on_thread_exit must be
called when a thread exits. For the DLL build of Boost.Thread, this is
done in the DLL_THREAD_DETACH handler. For the static lib, it hooks the
win32 executable TLS callback to do this. If you provide
tss_cleanup_implemented() you are declaring that you are going to do
this yourself somehow (e.g. as part of the thread function).

> Could you eventually provide some Good (TM) workaround and advice for this?

Link against the Boost.Thread DLL. Build your app with
BOOST_THREAD_USE_DLL defined to force the auto-link to choose this, and
ensure that the code is compatible.

Anthony
-- 
Author of C++ Concurrency in Action | http://www.manning.com/williams
just::thread C++0x thread library   | http://www.stdthread.co.uk
Just Software Solutions Ltd         | http://www.justsoftwaresolutions.co.uk
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