#include "schedule.h"
#include "common.h"
#include "model.h"
-#include "nodestack.h"
#include "execution.h"
+#include "fuzzer.h"
/**
* Format an "enabled_type_t" for printing
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));
+ real_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));
+ real_memcpy(new_enabled, enabled, enabled_len * sizeof(enabled_type_t));
snapshot_free(enabled);
}
enabled = new_enabled;
/**
* @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;
+ return is_sleep_set(t->get_id());
+}
+
+bool Scheduler::is_sleep_set(thread_id_t tid) const
+{
+ int id = id_to_int(tid);
+ ASSERT(id < enabled_len);
+ return enabled[id] == 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;
+ * @return True if no threads are enabled and 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++)
+ for (int i = 0;i < enabled_len;i++)
if (enabled[i] == THREAD_ENABLED)
return false;
else if (enabled[i] == THREAD_SLEEP_SET)
/**
* Add a Thread to the sleep set.
* @param t The Thread to add
+ * A Thread is in THREAD_SLEEP_SET if it is sleeping or blocked by a wait
+ * operation that should fail spuriously (decide by fuzzer).
*/
void Scheduler::add_sleep(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(Node *n)
+Thread * Scheduler::select_next_thread()
{
- 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;
+ int avail_threads = 0;
+ int sleep_threads = 0;
+ int thread_list[enabled_len], sleep_list[enabled_len];
+ Thread * thread;
+
+ for (int i = 0;i < enabled_len;i++) {
+ if (enabled[i] == THREAD_ENABLED)
+ thread_list[avail_threads++] = i;
+ else if (enabled[i] == THREAD_SLEEP_SET)
+ sleep_list[sleep_threads++] = i;
}
- while (avail_threads > 0) {
- int random_index = random() % 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 (enabled[curr_thread_index] == THREAD_ENABLED) {
- return model->get_thread(curr_tid);
- } else { // remove this threads from available threads
- thread_list[random_index] = thread_list[avail_threads - 1];
- avail_threads--;
+ if (avail_threads == 0 && !execution->getFuzzer()->has_paused_threads()) {
+ if (sleep_threads != 0) {
+ // No threads available, but some threads sleeping. Wake up one of them
+ thread = execution->getFuzzer()->selectThread(sleep_list, sleep_threads);
+ remove_sleep(thread);
+ thread->set_wakeup_state(true);
+ } else {
+ return NULL; // No threads available and no threads sleeping.
}
+ } else {
+ // Some threads are available
+ thread = execution->getFuzzer()->selectThread(thread_list, avail_threads);
}
-
- /* No thread was enabled */
- return NULL;
+
+ //curr_thread_index = id_to_int(thread->get_id());
+ return thread;
}
void Scheduler::set_scheduler_thread(thread_id_t tid) {
int curr_id = current ? id_to_int(current->get_id()) : -1;
model_print("Scheduler: ");
- for (int i = 0; i < enabled_len; i++) {
+ 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);