-#include <stdlib.h>
-
-#include "libthreads.h"
+#include "threads.h"
#include "schedule.h"
#include "common.h"
#include "model.h"
-struct thread *current;
+/** Constructor */
+Scheduler::Scheduler() :
+ current(NULL)
+{
+}
-void DefaultScheduler::add_thread(struct thread *t)
+/**
+ * Add a Thread to the scheduler's ready list.
+ * @param t The Thread to add
+ */
+void Scheduler::add_thread(Thread *t)
{
- DEBUG("thread %d\n", t->id);
- queue.push_back(t);
+ DEBUG("thread %d\n", t->get_id());
+ readyList.push_back(t);
}
-struct thread *DefaultScheduler::next_thread(void)
+/**
+ * Remove a given Thread from the scheduler.
+ * @param t The Thread to remove
+ */
+void Scheduler::remove_thread(Thread *t)
{
- struct thread *t;
+ if (current == t)
+ current = NULL;
+ else
+ readyList.remove(t);
+}
- if (queue.empty())
- return NULL;
+/**
+ * Remove one Thread from the scheduler. This implementation performs FIFO.
+ * @return The next Thread to run
+ */
+Thread * Scheduler::next_thread()
+{
+ Thread *t = model->schedule_next_thread();
- t = queue.front();
- queue.pop_front();
+ if (t != NULL) {
+ current = t;
+ readyList.remove(t);
+ } else if (readyList.empty()) {
+ t = NULL;
+ } else {
+ t = readyList.front();
+ current = t;
+ readyList.pop_front();
+ }
- current = t;
+ print();
return t;
}
-struct thread *DefaultScheduler::get_current_thread(void)
+/**
+ * @return The currently-running Thread
+ */
+Thread * Scheduler::get_current_thread() const
{
return current;
}
+
+/**
+ * Print debugging information about the current state of the scheduler. Only
+ * prints something if debugging is enabled.
+ */
+void Scheduler::print()
+{
+ if (current)
+ DEBUG("Current thread: %d\n", current->get_id());
+ else
+ DEBUG("No current thread\n");
+ DEBUG("Num. threads in ready list: %zu\n", readyList.size());
+
+ std::list<Thread *, MyAlloc< Thread * > >::iterator it;
+ for (it = readyList.begin(); it != readyList.end(); it++)
+ DEBUG("In ready list: thread %d\n", (*it)->get_id());
+}