Subj:

Это часть boost/asio/detail/win_event.hpp

class win_event
  : private noncopyable
{
public:
  // Constructor.
  win_event()
    : event_(::CreateEvent(0, true, false, 0))
  {
    if (!event_)
    {
      DWORD last_error = ::GetLastError();
      boost::system::system_error e(
          boost::system::error_code(last_error,
            boost::asio::error::get_system_category()),
          "event");
      boost::throw_exception(e);
    }
  }

  // Destructor.
  ~win_event()
  {
    ::CloseHandle(event_);
  }

  // Signal the event.
  template <typename Lock>
  void signal(Lock& lock)
  {
    BOOST_ASSERT(lock.locked());
    (void)lock;
    ::SetEvent(event_);
  }

  // Signal the event and unlock the mutex.
  template <typename Lock>
  void signal_and_unlock(Lock& lock)
  {
    BOOST_ASSERT(lock.locked());
    lock.unlock();
    ::SetEvent(event_);
  }

  // Reset the event.
  template <typename Lock>
  void clear(Lock& lock)
  {
    BOOST_ASSERT(lock.locked());
    (void)lock;
    ::ResetEvent(event_);
  }

  // Wait for the event to become signalled.
  template <typename Lock>
  void wait(Lock& lock)
  {
    BOOST_ASSERT(lock.locked());
    lock.unlock();
    ::WaitForSingleObject(event_, INFINITE);
    lock.lock();
  }

private:
  HANDLE event_;
};

Может кто-нибудь объяснить зачем нужен этот проклятый lock??? Заранее спасибо.