typedef struct CUDAWorker <Type, Isa> impl Worker {
  CUdevice device;
  CUcontext cuCtx;
  struct Context* context;
  int id;
  int loopCounter;
  int deviceNum;
  struct Queue* tasks;
  int runFlag;
  __code next(...);
  int numStream;
  struct Executor* executor;
  CUstream *stream;
} CUDAWorker;