11 Scheduler::Scheduler() :
19 void Scheduler::set_enabled(Thread *t, enabled_type_t enabled_status) {
20 int threadid=id_to_int(t->get_id());
21 if (threadid>=enabled_len) {
22 enabled_type_t *new_enabled = (enabled_type_t *)snapshot_malloc(sizeof(enabled_type_t) * (threadid + 1));
23 memset(&new_enabled[enabled_len], 0, (threadid+1-enabled_len)*sizeof(enabled_type_t));
24 if (is_enabled != NULL) {
25 memcpy(new_enabled, is_enabled, enabled_len*sizeof(enabled_type_t));
26 snapshot_free(is_enabled);
28 is_enabled=new_enabled;
29 enabled_len=threadid+1;
31 is_enabled[threadid]=enabled_status;
34 enabled_type_t Scheduler::get_enabled(Thread *t) {
35 return is_enabled[id_to_int(t->get_id())];
38 void Scheduler::update_sleep_set(Node *n) {
39 enabled_type_t *enabled_array=n->get_enabled_array();
40 for(int i=0;i<enabled_len;i++) {
41 if (enabled_array[i]==THREAD_SLEEP_SET) {
42 is_enabled[i]=THREAD_SLEEP_SET;
48 * Add a Thread to the sleep set.
49 * @param t The Thread to add
51 void Scheduler::add_sleep(Thread *t)
53 DEBUG("thread %d\n", id_to_int(t->get_id()));
54 set_enabled(t, THREAD_SLEEP_SET);
58 * Remove a Thread from the sleep set.
59 * @param t The Thread to remove
61 void Scheduler::remove_sleep(Thread *t)
63 DEBUG("thread %d\n", id_to_int(t->get_id()));
64 set_enabled(t, THREAD_ENABLED);
68 * Add a Thread to the scheduler's ready list.
69 * @param t The Thread to add
71 void Scheduler::add_thread(Thread *t)
73 DEBUG("thread %d\n", id_to_int(t->get_id()));
74 set_enabled(t, THREAD_ENABLED);
78 * Remove a given Thread from the scheduler.
79 * @param t The Thread to remove
81 void Scheduler::remove_thread(Thread *t)
85 set_enabled(t, THREAD_DISABLED);
89 * Prevent a Thread from being scheduled. The sleeping Thread should be
90 * re-awoken via Scheduler::wake.
91 * @param thread The Thread that should sleep
93 void Scheduler::sleep(Thread *t)
95 set_enabled(t, THREAD_DISABLED);
96 t->set_state(THREAD_BLOCKED);
100 * Wake a Thread up that was previously waiting (see Scheduler::wait)
101 * @param t The Thread to wake up
103 void Scheduler::wake(Thread *t)
105 set_enabled(t, THREAD_DISABLED);
106 t->set_state(THREAD_READY);
110 * Select a Thread. This implementation defaults to round-robin, if a
111 * thread is not already provided.
113 * @param t Thread to run, if chosen by an external entity (e.g.,
114 * ModelChecker). May be NULL to indicate no external choice.
115 * @return The next Thread to run
117 Thread * Scheduler::next_thread(Thread *t)
120 int old_curr_thread = curr_thread_index;
122 curr_thread_index = (curr_thread_index+1) % enabled_len;
123 if (is_enabled[curr_thread_index]==THREAD_ENABLED) {
124 t = model->get_thread(int_to_id(curr_thread_index));
127 if (curr_thread_index == old_curr_thread) {
133 curr_thread_index = id_to_int(t->get_id());
142 * @return The currently-running Thread
144 Thread * Scheduler::get_current_thread() const
150 * Print debugging information about the current state of the scheduler. Only
151 * prints something if debugging is enabled.
153 void Scheduler::print() const
156 DEBUG("Current thread: %d\n", id_to_int(current->get_id()));
158 DEBUG("No current thread\n");