X-Git-Url: http://plrg.eecs.uci.edu/git/?p=model-checker.git;a=blobdiff_plain;f=schedule.cc;h=2ef4c4d2f968ef2c97dffbf8f17a3e80c447c9cd;hp=f68cb528a16b846a2f2653ecd3336b6ca496fee8;hb=f0b1d5cb87fd3ae41c325045b6bbf9554e7116f9;hpb=9593acf48b245704a75d0e115d6dec1baf51f07c

diff --git a/schedule.cc b/schedule.cc
index f68cb52..2ef4c4d 100644
--- a/schedule.cc
+++ b/schedule.cc
@@ -6,9 +6,37 @@
 #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
+ */
+void enabled_type_to_string(enabled_type_t e, char *str)
+{
+	const char *res;
+	switch (e) {
+	case THREAD_DISABLED:
+		res = "disabled";
+		break;
+	case THREAD_ENABLED:
+		res = "enabled";
+		break;
+	case THREAD_SLEEP_SET:
+		res = "sleep";
+		break;
+	default:
+		ASSERT(0);
+		res = NULL;
+		break;
+	}
+	strcpy(str, res);
+}
 
 /** Constructor */
 Scheduler::Scheduler() :
+	execution(NULL),
 	enabled(NULL),
 	enabled_len(0),
 	curr_thread_index(0),
@@ -16,41 +44,98 @@ 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) {
+	int threadid = id_to_int(t->get_id());
+	if (threadid >= enabled_len) {
 		enabled_type_t *new_enabled = (enabled_type_t *)snapshot_malloc(sizeof(enabled_type_t) * (threadid + 1));
-		memset(&new_enabled[enabled_len], 0, (threadid+1-enabled_len)*sizeof(enabled_type_t));
+		memset(&new_enabled[enabled_len], 0, (threadid + 1 - enabled_len) * sizeof(enabled_type_t));
 		if (enabled != NULL) {
-			memcpy(new_enabled, enabled, enabled_len*sizeof(enabled_type_t));
+			memcpy(new_enabled, enabled, enabled_len * sizeof(enabled_type_t));
 			snapshot_free(enabled);
 		}
-		enabled=new_enabled;
-		enabled_len=threadid+1;
+		enabled = new_enabled;
+		enabled_len = threadid + 1;
 	}
-	enabled[threadid]=enabled_status;
+	enabled[threadid] = enabled_status;
+	if (enabled_status == THREAD_DISABLED)
+		execution->check_promises_thread_disabled();
 }
 
 /**
  * @brief Check if a Thread is currently enabled
+ *
+ * Check if a Thread is currently enabled. "Enabled" includes both
+ * THREAD_ENABLED and THREAD_SLEEP_SET.
  * @param t The Thread to check
  * @return True if the Thread is currently enabled
  */
-bool Scheduler::is_enabled(Thread *t) const
+bool Scheduler::is_enabled(const Thread *t) const
 {
-	int id = id_to_int(t->get_id());
-	return (id >= enabled_len) ? false : (enabled[id] != THREAD_DISABLED);
+	return is_enabled(t->get_id());
 }
 
-enabled_type_t Scheduler::get_enabled(Thread *t) {
-	return enabled[id_to_int(t->get_id())];
+/**
+ * @brief Check if a Thread is currently enabled
+ *
+ * Check if a Thread is currently enabled. "Enabled" includes both
+ * THREAD_ENABLED and THREAD_SLEEP_SET.
+ * @param tid The ID of the Thread to check
+ * @return True if the Thread is currently enabled
+ */
+bool Scheduler::is_enabled(thread_id_t tid) const
+{
+	int i = id_to_int(tid);
+	return (i >= enabled_len) ? false : (enabled[i] != THREAD_DISABLED);
+}
+
+/**
+ * @brief Check if a Thread is currently in the sleep set
+ * @param t The Thread to check
+ * @return True if the Thread is currently enabled
+ */
+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());
+	ASSERT(id < enabled_len);
+	return enabled[id];
 }
 
 void Scheduler::update_sleep_set(Node *n) {
-	enabled_type_t *enabled_array=n->get_enabled_array();
-	for(int i=0;i<enabled_len;i++) {
-		if (enabled_array[i]==THREAD_SLEEP_SET) {
-			enabled[i]=THREAD_SLEEP_SET;
+	enabled_type_t *enabled_array = n->get_enabled_array();
+	for (int i = 0; i < enabled_len; i++) {
+		if (enabled_array[i] == THREAD_SLEEP_SET) {
+			enabled[i] = THREAD_SLEEP_SET;
 		}
 	}
 }
@@ -120,52 +205,70 @@ void Scheduler::wake(Thread *t)
 }
 
 /**
- * Select a Thread. This implementation defaults to round-robin, if a
- * thread is not already provided.
+ * @brief Select a Thread to run via round-robin
+ *
+ * @param n The current Node, holding priority information for the next thread
+ * selection
  *
- * @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)
+Thread * Scheduler::select_next_thread(Node *n)
 {
-	if ( t == NULL ) {
-		int old_curr_thread = curr_thread_index;
-		bool have_enabled_thread_with_priority=false;
-		Node *n=model->get_curr_node();
+	int old_curr_thread = curr_thread_index;
 
-		for(int i=0;i<enabled_len;i++) {
-			thread_id_t tid=int_to_id(i);
+	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)) {
-				//Have a thread with priority
-				if (enabled[i]!=THREAD_DISABLED)
-					have_enabled_thread_with_priority=true;
+				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;
-			thread_id_t curr_tid=int_to_id(curr_thread_index);
-			if (enabled[curr_thread_index]==THREAD_ENABLED&&
-					(!have_enabled_thread_with_priority||n->has_priority(curr_tid))) {
-				t = model->get_thread(int_to_id(curr_tid));
-				break;
-			}
-			if (curr_thread_index == old_curr_thread) {
-				print();
-				return NULL;
+	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);
 		}
-	} else if (t->is_model_thread()) {
-		/* model-checker threads never run */
-		t = NULL;
-	} else {
-		curr_thread_index = id_to_int(t->get_id());
 	}
+	
+	/* No thread was enabled */
+	return NULL;
+}
+
+void Scheduler::set_scheduler_thread(thread_id_t tid) {
+	curr_thread_index=id_to_int(tid);
+}
+
+/**
+ * @brief Set the current "running" Thread
+ * @param t Thread to run
+ */
+void Scheduler::set_current_thread(Thread *t)
+{
+	ASSERT(!t || !t->is_model_thread());
 
 	current = t;
-	print();
-	return t;
+	if (DBG_ENABLED())
+		print();
 }
 
 /**
@@ -183,8 +286,13 @@ Thread * Scheduler::get_current_thread() const
  */
 void Scheduler::print() const
 {
-	if (current)
-		DEBUG("Current thread: %d\n", id_to_int(current->get_id()));
-	else
-		DEBUG("No current thread\n");
+	int curr_id = current ? id_to_int(current->get_id()) : -1;
+
+	model_print("Scheduler: ");
+	for (int i = 0; i < enabled_len; i++) {
+		char str[20];
+		enabled_type_to_string(enabled[i], str);
+		model_print("[%i: %s%s]", i, i == curr_id ? "current, " : "", str);
+	}
+	model_print("\n");
 }