#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
+ * @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),
{
}
+/**
+ * @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();
}
/**
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 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++)
+ 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());
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
}
/**
- * 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 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)
-{
- 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 avail_threads = 0;
+ int sleep_threads = 0;
+ int thread_list[enabled_len], sleep_list[enabled_len];
+ Thread * thread;
- 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) {
- if (DBG_ENABLED())
- print();
- return NULL;
- }
+ 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;
+ }
+
+ 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 if (t->is_model_thread()) {
- /* model-checker threads never run */
- t = NULL;
} else {
- curr_thread_index = id_to_int(t->get_id());
+ // Some threads are available
+ thread = execution->getFuzzer()->selectThread(thread_list, avail_threads);
}
+ curr_thread_index = id_to_int(thread->get_id());
+ return thread;
+}
+
+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;
if (DBG_ENABLED())
print();
- return t;
}
/**
*/
void Scheduler::print() const
{
- if (current)
- model_print("Current thread: %d\n", id_to_int(current->get_id()));
- else
- model_print("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");
}
projects / c11tester.git / blobdiff