#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),
}
/**
- * Select a Thread. This implementation defaults to round-robin, 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) {
- 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;
- }
+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;
}
+ }
- 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(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 (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());
+
+ //curr_thread_index = id_to_int(t->get_id());
current = t;
- print();
- return t;
+ if (DBG_ENABLED())
+ print();
}
/**
*/
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");
}