}
/**
- * Remove one Thread from the scheduler. This implementation performs FIFO.
- * @return The next Thread to run
+ * Prevent a Thread from being scheduled. The sleeping Thread should be
+ * re-awoken via Scheduler::wake.
+ * @param thread The Thread that should sleep
*/
-Thread * Scheduler::next_thread()
+void Scheduler::sleep(Thread *t)
{
- Thread *t = model->schedule_next_thread();
+ remove_thread(t);
+ t->set_state(THREAD_BLOCKED);
+}
+/**
+ * Wake a Thread up that was previously waiting (see Scheduler::wait)
+ * @param t The Thread to wake up
+ */
+void Scheduler::wake(Thread *t)
+{
+ add_thread(t);
+ t->set_state(THREAD_READY);
+}
+
+/**
+ * Remove one Thread from the scheduler. This implementation defaults to FIFO,
+ * if a thread is not already provided.
+ *
+ * @param t Thread to run, if chosen by an external entity (e.g.,
+ * ModelChecker). May be NULL to indicate no external choice.
+ * @return The next Thread to run
+ */
+Thread * Scheduler::next_thread(Thread *t)
+{
if (t != NULL) {
current = t;
readyList.remove(t);