cuda.hpp

  {
    void *m_data;
    CUDAPP_CALL_GUARDED(cuMemAllocHost, (&m_data, size));
    return m_data;
  }

  inline void mem_free_host(void *ptr)
  {
    CUDAPP_CALL_GUARDED(cuMemFreeHost, (ptr));
  }




  struct host_allocation : public boost::noncopyable
  {
    private:
      void *m_data;

    public:
      host_allocation(unsigned bytesize)
        : m_data(mem_alloc_host(bytesize))
      { }

      ~host_allocation()
      { free(); }

      void free()
      {
        if (m_data)
        {
          mem_free_host(m_data); 
          m_data = 0;
        }
      }
      
      void *data()
      { return m_data; }
  };




  // events -------------------------------------------------------------------
  class event : public boost::noncopyable, public context_dependent
  {
    private:
      CUevent m_event;

    public:
      event(unsigned int flags=0)
      { CUDAPP_CALL_GUARDED(cuEventCreate, (&m_event, flags)); }

      ~event()
      { 
        scoped_context_activation ca(get_context());
        CUDAPP_CALL_GUARDED(cuEventDestroy, (m_event)); 
      }

      void record()
      { CUDAPP_CALL_GUARDED(cuEventRecord, (m_event, 0)); }

      void record_in_stream(stream const &str)
      { CUDAPP_CALL_GUARDED(cuEventRecord, (m_event, str.handle())); }

      void synchronize()
      { CUDAPP_CALL_GUARDED_THREADED(cuEventSynchronize, (m_event)); }

      bool query() const
      { 
#ifdef TRACE_CUDA
        std::cerr << "cuEventQuery" << std::endl;
#endif
        CUresult result = cuEventQuery(m_event);
        switch (result)
        {
          case CUDA_SUCCESS: 
            return true;
          case CUDA_ERROR_NOT_READY: 
            return false;
          default:
            throw error("cuEventQuery", result);
        }
      }

      float time_since(event const &start)
      {
        float result;
        CUDAPP_CALL_GUARDED(cuEventElapsedTime, (&result, start.m_event, m_event));
        return result;
      }

      float time_till(event const &end)
      {
        float result;
        CUDAPP_CALL_GUARDED(cuEventElapsedTime, (&result, m_event, end.m_event));
        return result;
      }
  };
}




#endif