X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=schedule.cc;h=d96172e010d445a2b06eff5b392b89161126f12e;hb=5fe0eea8bf392753f69ed8193a592b299a137e9c;hp=04328252da0c8dbbf1452e4b7cd6d091c14a7116;hpb=f6c3c97520fa724c97c6a04eb8da4bf8a4bb2477;p=model-checker.git

diff --git a/schedule.cc b/schedule.cc
index 0432825..d96172e 100644
--- a/schedule.cc
+++ b/schedule.cc
@@ -3,24 +3,81 @@
 #include "common.h"
 #include "model.h"
 
+/** Constructor */
+Scheduler::Scheduler() :
+	current(NULL)
+{
+}
+
+/**
+ * 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->get_id());
 	readyList.push_back(t);
 }
 
-Thread *Scheduler::next_thread(void)
+/**
+ * Remove a given Thread from the scheduler.
+ * @param t The Thread to remove
+ */
+void Scheduler::remove_thread(Thread *t)
 {
-	if (readyList.empty())
-		return NULL;
+	if (current == t)
+		current = NULL;
+	else
+		readyList.remove(t);
+}
 
-	current = readyList.front();
-	readyList.pop_front();
+/**
+ * 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);
+	} else if (readyList.empty()) {
+		t = NULL;
+	} else {
+		t = readyList.front();
+		current = t;
+		readyList.pop_front();
+	}
 
-	return current;
+	print();
+
+	return t;
 }
 
-Thread *Scheduler::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() const
+{
+	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 * > >::const_iterator it;
+	for (it = readyList.begin(); it != readyList.end(); it++)
+		DEBUG("In ready list: thread %d\n", (*it)->get_id());
+}