Find a faster way to get currently executing thread's id

[c11tester.git] / schedule.cc

diff --git a/schedule.cc b/schedule.cc
index 62ba8fb3ff0ee631d960649286142d0608560135..30af582dcc237991b690f606eb0c1e5ca11afa1b 100644 (file)
--- a/schedule.cc
+++ b/schedule.cc
@@ -5,7 +5,8 @@
 #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
@@ -35,6 +36,7 @@ void enabled_type_to_string(enabled_type_t e, char *str)
 
 /** Constructor */
 Scheduler::Scheduler() :
+       execution(NULL),
        enabled(NULL),
        enabled_len(0),
        curr_thread_index(0),
@@ -42,6 +44,15 @@ Scheduler::Scheduler() :
 {
 }
 
+/**
+ * @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) {
@@ -55,8 +66,6 @@ void Scheduler::set_enabled(Thread *t, enabled_type_t enabled_status) {
                enabled_len = threadid + 1;
        }
        enabled[threadid] = enabled_status;
-       if (enabled_status == THREAD_DISABLED)
-               model->check_promises_thread_disabled();
 }
 
 /**
@@ -93,19 +102,26 @@ bool Scheduler::is_enabled(thread_id_t tid) const
  */
 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)
@@ -120,15 +136,6 @@ enabled_type_t Scheduler::get_enabled(const Thread *t) const
        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
@@ -195,49 +202,40 @@ void Scheduler::wake(Thread *t)
 
 /**
  * @brief Select a Thread to run via round-robin
+ *
+ *
  * @return The next Thread to run
  */
 Thread * Scheduler::select_next_thread()
 {
-       int old_curr_thread = curr_thread_index;
-       Node *n = model->get_curr_node();
+       int avail_threads = 0;
+       int sleep_threads = 0;
+       int thread_list[enabled_len], sleep_list[enabled_len];
+       Thread * thread;
 
-       bool have_enabled_thread_with_priority = false;
-       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;
-                       }
-               }
-       }       
+       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;
+       }
 
-       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 (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)
-                               continue;
-               }
-               
-               if (enabled[curr_thread_index] == THREAD_ENABLED &&
-                               (!have_enabled_thread_with_priority || n->has_priority(curr_tid))) {
-                       return model->get_thread(curr_tid);
+       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) {
@@ -275,7 +273,7 @@ void Scheduler::print() const
        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);