void __SD_task_set_state(SD_task_t task, e_SD_task_state_t new_state);
surf_action_t __SD_task_run(SD_task_t task);
-void __SD_task_remove_dependencies(SD_task_t task);
/* Functions to test if the task is in a given state.
These functions are faster than using SD_task_get_state() */