+struct _list_sched_selector_t {
+
+ /**
+ * Called before a graph is being scheduled.
+ * @param isa The isa.
+ * @param irg The graph.
+ * @return The environment pointer that is passed to all other
+ * functions in this struct.
+ */
+ void *(*init_graph)(const list_sched_selector_t *vtab, const struct _arch_isa_t *isa, ir_graph *irg);
+
+ /**
+ * Called before scheduling starts on a block.
+ * @param graph_env The environment.
+ * @param block The block which is to be scheduled.
+ * @return A per-block pointer that is additionally passed to select.
+ */
+ void *(*init_block)(void *graph_env, ir_node *block);
+
+ /**
+ * The selection function.
+ * It picks one node out of the ready list to be scheduled next.
+ * The function does not have to delete the node from the ready set.
+ *
+ * @return block_env Some private information as returned by init_block().
+ * @param sched_head The schedule so far.
+ * @param curr_time The current time step which the picked node
+ * will be assigned to.
+ * @param ready_list A set containing all ready nodes. Pick one of these
+ * nodes.
+ * @return The chosen node.
+ */
+ ir_node *(*select)(void *block_env, pset *ready_set);
+
+ /**
+ * This function decides, if a node should appear in a schedule.
+ * @param block_env The block environment.
+ * @param irn The node.
+ * @return 1, if the node should be scheduled, 0 if not.
+ */
+ int (*to_appear_in_schedule)(void *block_env, const ir_node *irn);
+
+ /**
+ * Called after a block has been scheduled.
+ * @param env The environment.
+ * @param block_env The per block environment as returned by init_block().
+ */
+ void (*finish_block)(void *block_env);
+
+ /**
+ * Called after a whole graph has been scheduled.
+ * @param env The environment.
+ */
+ void (*finish_graph)(void *env);
+
+};