error category thread safety (system + asio) c++98

[richard@…]

Foo.exe!boost::system::error_code::category() Line 355

I produced this with a global io_service and calling poll_once in a loop inside a second win32 thread. The program runs for an indeterminate amount of time before one of the calls to the handler results in an access violation (see above).

Is asio meant to work without c++11 suppport?