Re: [Boost-users] [ASIO] Where to use CoInitizeEx

3 Jun 2009

      On Wed, Jun 3, 2009 at 8:35 AM, Ovanes Markarian wrote:
...
On Wed, Jun 3, 2009 at 3:21 PM, Daniele Barzotti <
daniele.barzotti@eurocomtel.com> wrote:
...
void io_worker_thread(void)
{
#if (WIN32)
 CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
#endif
io_service.run();
#if (WIN32)
 CoUninitialize();
#endif
};
It is better to use at least RAII here. This approach is not exception safe
and if io_service.run() throws an exception CoUnintialize() will not be
called.
For per-thread COM Initialization in the presence of boost I almost always
do the following:

//Put in a widely visible header file somewhere
struct com_init;
extern boost::thread_specific_ptr com_initialized;

//In a CPP file somewhere
boost::thread_specific_ptr com_initialized;

struct com_init
{
public:
    com_init() { CoInitialize(NULL); }
    ~com_init() { CoUninitialize(); }

    static void verify_com_init()
    {
        if (!com_initialized)
            com_initialized.reset(new com_init());
    }
};

For threads you create yourself, call com_init::verify_com_init() at the
beginning of the thread function, for functions that run in threads you
don't create, call com_init::verify_com_init() at the beginning of every
invocation.

Re: [Boost-users] [ASIO] Where to use CoInitizeEx

Zachary Turner