Re: [Boost-users] Trouble with asio using lib pion and boost.function

AMDG Stephan Menzel wrote:

I'm not actually sure this is a boost problem but I'll give it a try and ask for your opinion. Boost version is 1.36

I have a daemon here realising a web interface using pion and asio. Pion is also using asio. On Linux everything runs fine and I have my web interface, but using the same code on windows / vs 2005 I get the weirdest errors such as

" Unhandled exception at 0x1004e55d in myapp.exe: 0xC0000005: Access violation reading location 0xcdcdcdd1."

The debugger tells me this happens in function_template.hpp:

#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS> typename BOOST_FUNCTION_FUNCTION< R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_ARGS>::result_type BOOST_FUNCTION_FUNCTION<R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_ARGS> ::operator()(BOOST_FUNCTION_PARMS) const { if (this->empty()) boost::throw_exception(bad_function_call());

return static_cast(vtable)->invoker (this->functor BOOST_FUNCTION_COMMA BOOST_FUNCTION_ARGS); } #endif

It says the static_cast rises the exception (?!) Damn MS.

a) Is the error on the static_cast or on reading the function pointer? b) does it happen consistently?

Can anyone help shed some light on this?

This could be the 1.36 Boost.Function thread safety regression. There is a race condition that can prevent invoker from being properly initialized before it is used. In Christ, Steven Watanabe