/**
* Unregister all tasks.
*
+ * \param s The scheduler instance to shut down.
+ *
* This will cause \a schedule() to return immediately because both the
* \a pre_select_list and the \a post_select_list are empty. This function
* must be called from the post_select (rather than the pre_select) method.
/**
* Get the list of all registered tasks.
*
+ * \param s The scheduler instance to get the task list from.
+ *
* \return The task list.
*
* Each entry of the list contains an identifier which is simply a hex number.