X-Git-Url: http://plrg.eecs.uci.edu/git/?p=c11tester.git;a=blobdiff_plain;f=schedule.cc;h=e87490313cf4836e1f11dab9528ef7ad00b6bf26;hp=be4a92f739a1129bb2aa4bee50bb23ba0a3f8556;hb=5fa2efec1354b2781ff0b29460ec8e9b8fa75991;hpb=c5b57f3d98d1d14b4546995a0882753cf71a1c4b

diff --git a/schedule.cc b/schedule.cc
index be4a92f7..e8749031 100644
--- a/schedule.cc
+++ b/schedule.cc
@@ -1,22 +1,146 @@
-#include "threads.h"
+#include <string.h>
+#include <stdlib.h>
+
+#include "threads-model.h"
 #include "schedule.h"
 #include "common.h"
 #include "model.h"
+#include "nodestack.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)
+{
+	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() :
+	enabled(NULL),
+	enabled_len(0),
+	curr_thread_index(0),
 	current(NULL)
 {
 }
 
+void Scheduler::set_enabled(Thread *t, enabled_type_t enabled_status) {
+	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));
+		if (enabled != NULL) {
+			memcpy(new_enabled, enabled, enabled_len * sizeof(enabled_type_t));
+			snapshot_free(enabled);
+		}
+		enabled = new_enabled;
+		enabled_len = threadid + 1;
+	}
+	enabled[threadid] = enabled_status;
+	if (enabled_status == THREAD_DISABLED)
+		model->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(const Thread *t) const
+{
+	return is_enabled(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;
+}
+
+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;
+		}
+	}
+}
+
+/**
+ * Add a Thread to the sleep set.
+ * @param t The Thread to add
+ */
+void Scheduler::add_sleep(Thread *t)
+{
+	DEBUG("thread %d\n", id_to_int(t->get_id()));
+	set_enabled(t, THREAD_SLEEP_SET);
+}
+
+/**
+ * Remove a Thread from the sleep set.
+ * @param t The Thread to remove
+ */
+void Scheduler::remove_sleep(Thread *t)
+{
+	DEBUG("thread %d\n", id_to_int(t->get_id()));
+	set_enabled(t, THREAD_ENABLED);
+}
+
 /**
  * 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);
+	DEBUG("thread %d\n", id_to_int(t->get_id()));
+	ASSERT(!t->is_model_thread());
+	set_enabled(t, THREAD_ENABLED);
 }
 
 /**
@@ -27,22 +151,18 @@ void Scheduler::remove_thread(Thread *t)
 {
 	if (current == t)
 		current = NULL;
-	else
-		readyList.remove(t);
+	set_enabled(t, THREAD_DISABLED);
 }
 
 /**
- * Force one Thread to wait on another Thread. The "join" Thread should
- * eventually wake up the waiting Thread via Scheduler::wake.
- * @param wait The Thread that should wait
- * @param join The Thread on which we are waiting.
+ * Prevent a Thread from being scheduled. The sleeping Thread should be
+ * re-awoken via Scheduler::wake.
+ * @param thread The Thread that should sleep
  */
-void Scheduler::wait(Thread *wait, Thread *join)
+void Scheduler::sleep(Thread *t)
 {
-	ASSERT(!join->is_complete());
-	remove_thread(wait);
-	join->push_wait_list(wait);
-	wait->set_state(THREAD_BLOCKED);
+	set_enabled(t, THREAD_DISABLED);
+	t->set_state(THREAD_BLOCKED);
 }
 
 /**
@@ -51,34 +171,55 @@ void Scheduler::wait(Thread *wait, Thread *join)
  */
 void Scheduler::wake(Thread *t)
 {
-	add_thread(t);
+	ASSERT(!t->is_model_thread());
+	set_enabled(t, THREAD_ENABLED);
 	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.
+ * @brief Select a Thread to run via round-robin
  * @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();
+Thread * Scheduler::select_next_thread()
+{
+	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);
+			if (enabled[i] != THREAD_DISABLED)
+				have_enabled_thread_with_priority = true;
+		}
+	}
+
+	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 (enabled[curr_thread_index] == THREAD_ENABLED &&
+				(!have_enabled_thread_with_priority || n->has_priority(curr_tid))) {
+			return model->get_thread(curr_tid);
+		}
 	}
+	/* No thread was enabled */
+	return NULL;
+}
 
-	print();
+/**
+ * @brief Set the current "running" Thread
+ * @param t Thread to run
+ */
+void Scheduler::set_current_thread(Thread *t)
+{
+	ASSERT(t && !t->is_model_thread());
+
+	curr_thread_index = id_to_int(t->get_id());
 
-	return t;
+	current = t;
+	if (DBG_ENABLED())
+		print();
 }
 
 /**
@@ -86,6 +227,7 @@ Thread * Scheduler::next_thread(Thread *t)
  */
 Thread * Scheduler::get_current_thread() const
 {
+	ASSERT(!current || !current->is_model_thread());
 	return current;
 }
 
@@ -95,13 +237,13 @@ Thread * Scheduler::get_current_thread() const
  */
 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());
+	int curr_id = current ? id_to_int(current->get_id()) : -1;
 
-	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());
+	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");
 }