X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=schedule.cc;h=2ef4c4d2f968ef2c97dffbf8f17a3e80c447c9cd;hb=2d0d4ac38e05905a6633b3f2d5112ccadd45c27f;hp=6d7b63d13390b22d9320409c01676c3452caeb6b;hpb=1857316e6637ac144952a274ff020629abe83807;p=model-checker.git

diff --git a/schedule.cc b/schedule.cc
index 6d7b63d..2ef4c4d 100644
--- a/schedule.cc
+++ b/schedule.cc
@@ -6,13 +6,14 @@
 #include "common.h"
 #include "model.h"
 #include "nodestack.h"
+#include "execution.h"
 
 /**
  * Format an "enabled_type_t" for printing
  * @param e The type to format
  * @param str The output character array
  */
-static void enabled_type_to_string(enabled_type_t e, char *str)
+void enabled_type_to_string(enabled_type_t e, char *str)
 {
 	const char *res;
 	switch (e) {
@@ -35,6 +36,7 @@ static void enabled_type_to_string(enabled_type_t e, char *str)
 
 /** Constructor */
 Scheduler::Scheduler() :
+	execution(NULL),
 	enabled(NULL),
 	enabled_len(0),
 	curr_thread_index(0),
@@ -42,6 +44,15 @@ Scheduler::Scheduler() :
 {
 }
 
+/**
+ * @brief Register the ModelExecution engine
+ * @param execution The ModelExecution which is controlling execution
+ */
+void Scheduler::register_engine(ModelExecution *execution)
+{
+	this->execution = execution;
+}
+
 void Scheduler::set_enabled(Thread *t, enabled_type_t enabled_status) {
 	int threadid = id_to_int(t->get_id());
 	if (threadid >= enabled_len) {
@@ -56,7 +67,7 @@ void Scheduler::set_enabled(Thread *t, enabled_type_t enabled_status) {
 	}
 	enabled[threadid] = enabled_status;
 	if (enabled_status == THREAD_DISABLED)
-		model->check_promises_thread_disabled();
+		execution->check_promises_thread_disabled();
 }
 
 /**
@@ -96,6 +107,23 @@ bool Scheduler::is_sleep_set(const Thread *t) const
 	return get_enabled(t) == THREAD_SLEEP_SET;
 }
 
+/**
+ * @brief Check if execution is stuck with no enabled threads and some sleeping
+ * thread
+ * @return True if no threads are enabled an some thread is in the sleep set;
+ * false otherwise
+ */
+bool Scheduler::all_threads_sleeping() const
+{
+	bool sleeping = false;
+	for (int i = 0; i < enabled_len; i++)
+		if (enabled[i] == THREAD_ENABLED)
+			return false;
+		else if (enabled[i] == THREAD_SLEEP_SET)
+			sleeping = true;
+	return sleeping;
+}
+
 enabled_type_t Scheduler::get_enabled(const Thread *t) const
 {
 	int id = id_to_int(t->get_id());
@@ -178,34 +206,56 @@ void Scheduler::wake(Thread *t)
 
 /**
  * @brief Select a Thread to run via round-robin
+ *
+ * @param n The current Node, holding priority information for the next thread
+ * selection
+ *
  * @return The next Thread to run
  */
-Thread * Scheduler::select_next_thread()
+Thread * Scheduler::select_next_thread(Node *n)
 {
 	int old_curr_thread = curr_thread_index;
-	bool have_enabled_thread_with_priority = false;
-	Node *n = model->get_curr_node();
 
-	for (int i = 0; i < enabled_len; i++) {
-		thread_id_t tid = int_to_id(i);
-		if (n->has_priority(tid)) {
-			DEBUG("Node (tid %d) has priority\n", i);
-			//Have a thread with priority
-			if (enabled[i] != THREAD_DISABLED)
-				have_enabled_thread_with_priority = true;
+	bool have_enabled_thread_with_priority = false;
+	if (model->params.fairwindow != 0) {
+		for (int i = 0; i < enabled_len; i++) {
+			thread_id_t tid = int_to_id(i);
+			if (n->has_priority(tid)) {
+				DEBUG("Node (tid %d) has priority\n", i);
+				if (enabled[i] != THREAD_DISABLED)
+					have_enabled_thread_with_priority = true;
+			}
 		}
-	}
+	}	
 
-	while (true) {
-		curr_thread_index = (curr_thread_index + 1) % enabled_len;
+	for (int i = 0; i < enabled_len; i++) {
+		curr_thread_index = (old_curr_thread + i + 1) % enabled_len;
 		thread_id_t curr_tid = int_to_id(curr_thread_index);
+		if (model->params.yieldon) {
+			bool bad_thread = false;
+			for (int j = 0; j < enabled_len; j++) {
+				thread_id_t tother = int_to_id(j);
+				if ((enabled[j] != THREAD_DISABLED) && n->has_priority_over(curr_tid, tother)) {
+					bad_thread=true;
+					break;
+				}
+			}
+			if (bad_thread)
+				continue;
+		}
+		
 		if (enabled[curr_thread_index] == THREAD_ENABLED &&
 				(!have_enabled_thread_with_priority || n->has_priority(curr_tid))) {
 			return model->get_thread(curr_tid);
 		}
-		if (curr_thread_index == old_curr_thread)
-			return NULL;
 	}
+	
+	/* No thread was enabled */
+	return NULL;
+}
+
+void Scheduler::set_scheduler_thread(thread_id_t tid) {
+	curr_thread_index=id_to_int(tid);
 }
 
 /**
@@ -214,9 +264,7 @@ Thread * Scheduler::select_next_thread()
  */
 void Scheduler::set_current_thread(Thread *t)
 {
-	ASSERT(t && !t->is_model_thread());
-
-	curr_thread_index = id_to_int(t->get_id());
+	ASSERT(!t || !t->is_model_thread());
 
 	current = t;
 	if (DBG_ENABLED())