#include "common.h"
#include "model.h"
#include "nodestack.h"
+#include "execution.h"
/**
* Format an "enabled_type_t" for printing
/** Constructor */
Scheduler::Scheduler() :
+ execution(NULL),
enabled(NULL),
enabled_len(0),
curr_thread_index(0),
{
}
+/**
+ * @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) {
enabled_len = threadid + 1;
}
enabled[threadid] = enabled_status;
- if (enabled_status == THREAD_DISABLED)
- model->check_promises_thread_disabled();
}
/**
/**
* @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);
- if (enabled[i] != THREAD_DISABLED)
- have_enabled_thread_with_priority = true;
+ 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;
+ }
}
+ }
+
+ int avail_threads = enabled_len; // number of available threads
+ int thread_list[enabled_len]; // keep a list of threads to select from
+ for (int i = 0; i< enabled_len; i++){
+ thread_list[i] = i;
}
- for (int i = 0; i < enabled_len; i++) {
- curr_thread_index = (old_curr_thread + i + 1) % enabled_len;
+ while (avail_threads > 0) {
+ int random_index = rand() % avail_threads;
+ curr_thread_index = thread_list[random_index]; // randomly select a thread from available threads
+
+ // curr_thread_index = (curr_thread_index + 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) {
+ thread_list[random_index] = thread_list[avail_threads - 1]; // remove this threads from available threads
+ avail_threads--;
+
+ 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 { // remove this threads from available threads
+ thread_list[random_index] = thread_list[avail_threads - 1];
+ avail_threads--;
}
}
+
/* No thread was enabled */
return NULL;
}
*/
void Scheduler::set_current_thread(Thread *t)
{
- ASSERT(t && !t->is_model_thread());
+ ASSERT(!t || !t->is_model_thread());
current = t;
if (DBG_ENABLED())