Function try_lock_internal

extern/boost/boost/thread/lock_algorithms.hpp:24–37

  {
    template <typename MutexType1, typename MutexType2>
    unsigned try_lock_internal(MutexType1& m1, MutexType2& m2)
    {
      boost::unique_lock<MutexType1> l1(m1, boost::try_to_lock);
      if (!l1)
      {
        return 1;
      }
      if (!m2.try_lock())
      {
        return 2;
      }
      l1.release();
      return 0;
    }

    template <typename MutexType1, typename MutexType2, typename MutexType3>
    unsigned try_lock_internal(MutexType1& m1, MutexType2& m2, MutexType3& m3)