grpc_probe - Checks the session execution status.
  grpc_error_t grpc_probe(grpc_sessionid_t session_id)
  grpc_sessionid_t session_idThe grpc_probe() function returns the execution status of the session specified by the session ID.
This function is MT-safe.
If the session is completed, GRPC_NO_ERROR is returned. Otherwise, GRPC_NOT_COMPLETED is returned. If the grpc_probe itself failed, Error code is returned.
  GRPC_NOT_INITIALIZED  GRPC_INVALID_SESSION_ID  GRPC_NOT_COMPLETED  GRPC_OTHER_ERROR_CODE