message: support per-thread default stream
diff: @@ -43,7 +43,11 @@ inline __host__ __device__
  cudaStream_t
  default_stream()
  {
  +#ifdef CUDA_API_PER_THREAD_DEFAULT_STREAM
  + return cudaStreamPerThread;
  +#else
  return cudaStreamLegacy;
  +#endif
  }
  // Fallback implementation of the customization point.
  