Hi, I have a C++ DLL which has exported functions which is used in a C# application via DllImport. The C++ DLL is linked to various .lib files which use boost functionality (thread, asio etc) internally and are compiled with BOOST_ALL_DYN_LINK option. When I run the application it just hangs with following stack trace. I get the same results if I convert this to a C++\CLI DLL and use it directly from the C# application. Stack Trace: ------------------------------------------------ OneComShim.dll!boost::asio::detail::win_thread::start_thread(boost::asio::detail ::win_thread::func_base * arg=0x035574f0, unsigned int stack_size=0x00010000) Line 98 + 0xe bytes C++ OneComShim.dll!boost::asio::detail::win_thread::win_thread<boost::asio::detail:: win_iocp_io_service::timer_thread_function> (boost::asio::detail::win_iocp_io_service::timer_thread_function f={...}, unsigned int stack_size=0x00010000) Line 72 C++ OneComShim.dll!boost::asio::detail::win_iocp_io_service::do_add_timer_queue(boos t::asio::detail::timer_queue_base & queue={...}) Line 471 + 0x31 bytes C++ OneComShim.dll!boost::asio::detail::win_iocp_io_service::add_timer_queue<boost:: asio::time_traits<boost::posix_time::ptime> > (boost::asio::detail::timer_queue<boost::asio::time_traits<boost::posix_time::pt ime> > & queue={...}) Line 78 C++ OneComShim.dll!boost::asio::detail::deadline_timer_service<boost::asio::time_tra its<boost::posix_time::ptime>

::deadline_timer_service<boost::asio::time_traits<boost::posix_time::ptime>

(boost::asio::io_service & io_service={...}) Line 68 C++ OneComShim.dll!boost::asio::deadline_timer_service<boost::posix_time::ptime,boos t::asio::time_traits<boost::posix_time::ptime>

::deadline_timer_service<boost::posix_time::ptime,boost::asio::time_traits<boos t::posix_time::ptime> >(boost::asio::io_service & io_service={...}) Line 73 C++ OneComShim.dll!boost::asio::detail::service_registry::create<boost::asio::deadli ne_timer_service<boost::posix_time::ptime,boost::asio::time_traits<boost::posix_ time::ptime> > >(boost::asio::io_service & owner={...}) Line 81 + 0x2f bytes C++ OneComShim.dll!boost::asio::detail::service_registry::do_use_service(const boost::asio::io_service::service::key & key={...}, boost::asio::io_service::service * (boost::asio::io_service &)* factory=0x100c770d) Line 123 + 0xc bytes C++ OneComShim.dll!boost::asio::detail::service_registry::use_service<boost::asio::d eadline_timer_service<boost::posix_time::ptime,boost::asio::time_traits<boost::p osix_time::ptime> > >() Line 49 C++ OneComShim.dll!boost::asio::use_service<boost::asio::deadline_timer_service<boos t::posix_time::ptime,boost::asio::time_traits<boost::posix_time::ptime> > > (boost::asio::io_service & ios={...}) Line 34 C++ OneComShim.dll!boost::asio::basic_io_object<boost::asio::deadline_timer_service< boost::posix_time::ptime,boost::asio::time_traits<boost::posix_time::ptime>

::basic_io_object<boost::asio::deadline_timer_service<boost::posix_time::ptime, boost::asio::time_traits<boost::posix_time::ptime> > (boost::asio::io_service & io_service={...}) Line 91 + 0x4b bytes C++ OneComShim.dll!boost::asio::basic_deadline_timer<boost::posix_time::ptime,boost: :asio::time_traits<boost::posix_time::ptime>,boost::asio::deadline_timer_service <boost::posix_time::ptime,boost::asio::time_traits<boost::posix_time::ptime>

::basic_deadline_timer<boost::posix_time::ptime,boost::asio::time_traits<boost: :posix_time::ptime>,boost::asio::deadline_timer_service<boost::posix_time::ptime ,boost::asio::time_traits<boost::posix_time::ptime> > (boost::asio::io_service & io_service={...}) Line 147 C++ OneComShim.dll!CORE::SERVER_COMMUNICATOR::CurlHandler::CurlHandler(CORE::SERVER_ COMMUNICATOR::ServerAgent * serverAgent=0x1029c950) Line 37 + 0x118 bytes C++ OneComShim.dll!CORE::SERVER_COMMUNICATOR::ServerAgent::ServerAgent() Line 22 C++ OneComShim.dll!`dynamic initializer for 'CORE::SERVER_COMMUNICATOR::ServerAgent::agent''() Line 17 + 0x28 bytes C++ TestWin.exe!TestWin.Program.Main(string[] args = {string[0x00000000]}) Line 16 +

As it can be seen, it stops in start_thread inside win_thread.ipp at following lines on WaitForSingleObject if (entry_event) { ::WaitForSingleObject(entry_event, INFINITE); ::CloseHandle(entry_event); } I am just creating a timer object in the code and do not understand why it leads to this situation. Also everything works fine when I use a LIB instead of DLL and all code is in C++. Environment details are as follows OS: Win XP IDE: Visual Studio 2010 Boost version: boost_1_48_0 Regards, Chaitanya