#include <stdio.h>
#include <algorithm>
+#include <mutex>
#include "model.h"
#include "action.h"
#include "cyclegraph.h"
#include "promise.h"
#include "datarace.h"
-#include "mutex.h"
-#include "threads.h"
+#include "threads-model.h"
#define INITIAL_THREAD_ID 0
thread_map(new HashTable<int, Thread *, int>()),
obj_map(new HashTable<const void *, action_list_t, uintptr_t, 4>()),
lock_waiters_map(new HashTable<const void *, action_list_t, uintptr_t, 4>()),
+ condvar_waiters_map(new HashTable<const void *, action_list_t, uintptr_t, 4>()),
obj_thrd_map(new HashTable<void *, std::vector<action_list_t>, uintptr_t, 4 >()),
promises(new std::vector< Promise *, SnapshotAlloc<Promise *> >()),
futurevalues(new std::vector< struct PendingFutureValue, SnapshotAlloc<struct PendingFutureValue> >()),
delete obj_thrd_map;
delete obj_map;
delete lock_waiters_map;
+ delete condvar_waiters_map;
delete action_trace;
for (unsigned int i = 0; i < promises->size(); i++)
return ++priv->used_sequence_numbers;
}
+Node * ModelChecker::get_curr_node() {
+ return node_stack->get_head();
+}
+
/**
* @brief Choose the next thread to execute.
*
scheduler->update_sleep_set(prevnode);
/* Reached divergence point */
- if (nextnode->increment_promise()) {
+ if (nextnode->increment_misc()) {
+ /* The next node will try to satisfy a different misc_index values. */
+ tid = next->get_tid();
+ node_stack->pop_restofstack(2);
+ } else if (nextnode->increment_promise()) {
/* The next node will try to satisfy a different set of promises. */
tid = next->get_tid();
node_stack->pop_restofstack(2);
DEBUG("Number of acquires waiting on pending release sequences: %zu\n",
pending_rel_seqs->size());
- if (isfinalfeasible() || DBG_ENABLED())
+
+ if (isfinalfeasible() || (params.bound != 0 && priv->used_sequence_numbers > params.bound ) || DBG_ENABLED() )
print_summary();
if ((diverge = get_next_backtrack()) == NULL)
}
break;
}
+ case ATOMIC_WAIT: {
+ /* linear search: from most recent to oldest */
+ action_list_t *list = obj_map->get_safe_ptr(act->get_location());
+ action_list_t::reverse_iterator rit;
+ for (rit = list->rbegin(); rit != list->rend(); rit++) {
+ ModelAction *prev = *rit;
+ if (!act->same_thread(prev)&&prev->is_failed_trylock())
+ return prev;
+ if (!act->same_thread(prev)&&prev->is_notify())
+ return prev;
+ }
+ break;
+ }
+
+ case ATOMIC_NOTIFY_ALL:
+ case ATOMIC_NOTIFY_ONE: {
+ /* linear search: from most recent to oldest */
+ action_list_t *list = obj_map->get_safe_ptr(act->get_location());
+ action_list_t::reverse_iterator rit;
+ for (rit = list->rbegin(); rit != list->rend(); rit++) {
+ ModelAction *prev = *rit;
+ if (!act->same_thread(prev)&&prev->is_wait())
+ return prev;
+ }
+ break;
+ }
default:
break;
}
waiters->clear();
break;
}
+ case ATOMIC_WAIT: {
+ //unlock the lock
+ state->islocked = false;
+ //wake up the other threads
+ action_list_t *waiters = lock_waiters_map->get_safe_ptr((void *) curr->get_value());
+ //activate all the waiting threads
+ for (action_list_t::iterator rit = waiters->begin(); rit != waiters->end(); rit++) {
+ scheduler->wake(get_thread(*rit));
+ }
+ waiters->clear();
+ //check whether we should go to sleep or not...simulate spurious failures
+ if (curr->get_node()->get_misc()==0) {
+ condvar_waiters_map->get_safe_ptr(curr->get_location())->push_back(curr);
+ //disable us
+ scheduler->sleep(get_current_thread());
+ }
+ break;
+ }
+ case ATOMIC_NOTIFY_ALL: {
+ action_list_t *waiters = condvar_waiters_map->get_safe_ptr(curr->get_location());
+ //activate all the waiting threads
+ for (action_list_t::iterator rit = waiters->begin(); rit != waiters->end(); rit++) {
+ scheduler->wake(get_thread(*rit));
+ }
+ waiters->clear();
+ break;
+ }
+ case ATOMIC_NOTIFY_ONE: {
+ action_list_t *waiters = condvar_waiters_map->get_safe_ptr(curr->get_location());
+ int wakeupthread=curr->get_node()->get_misc();
+ action_list_t::iterator it = waiters->begin();
+ advance(it, wakeupthread);
+ scheduler->wake(get_thread(*it));
+ waiters->erase(it);
+ break;
+ }
+
default:
ASSERT(0);
}
break;
}
case THREAD_JOIN: {
- Thread *waiting, *blocking;
- waiting = get_thread(curr);
- blocking = (Thread *)curr->get_location();
- if (!blocking->is_complete()) {
- blocking->push_wait_list(curr);
- scheduler->sleep(waiting);
- } else {
- do_complete_join(curr);
- updated = true; /* trigger rel-seq checks */
- }
+ Thread *blocking = (Thread *)curr->get_location();
+ ModelAction *act = get_last_action(blocking->get_id());
+ curr->synchronize_with(act);
+ updated = true; /* trigger rel-seq checks */
break;
}
case THREAD_FINISH: {
Thread *th = get_thread(curr);
while (!th->wait_list_empty()) {
ModelAction *act = th->pop_wait_list();
- Thread *wake = get_thread(act);
- scheduler->wake(wake);
- do_complete_join(act);
- updated = true; /* trigger rel-seq checks */
+ scheduler->wake(get_thread(act));
}
th->complete();
updated = true; /* trigger rel-seq checks */
compute_promises(newcurr);
else if (newcurr->is_relseq_fixup())
compute_relseq_breakwrites(newcurr);
+ else if (newcurr->is_wait())
+ newcurr->get_node()->set_misc_max(2);
+ else if (newcurr->is_notify_one()) {
+ newcurr->get_node()->set_misc_max(condvar_waiters_map->get_safe_ptr(newcurr->get_location())->size());
+ }
}
return newcurr;
}
/**
- * This method checks whether a model action is enabled at the given point.
- * At this point, it checks whether a lock operation would be successful at this point.
- * If not, it puts the thread in a waiter list.
+ * @brief Check whether a model action is enabled.
+ *
+ * Checks whether a lock or join operation would be successful (i.e., is the
+ * lock already locked, or is the joined thread already complete). If not, put
+ * the action in a waiter list.
+ *
* @param curr is the ModelAction to check whether it is enabled.
* @return a bool that indicates whether the action is enabled.
*/
lock_waiters_map->get_safe_ptr(curr->get_location())->push_back(curr);
return false;
}
+ } else if (curr->get_type() == THREAD_JOIN) {
+ Thread *blocking = (Thread *)curr->get_location();
+ if (!blocking->is_complete()) {
+ blocking->push_wait_list(curr);
+ return false;
+ }
}
return true;
if (!check_action_enabled(curr)) {
/* Make the execution look like we chose to run this action
- * much later, when a lock is actually available to release */
+ * much later, when a lock/join can succeed */
get_current_thread()->set_pending(curr);
scheduler->sleep(get_current_thread());
return get_next_thread(NULL);
}
- wake_up_sleeping_actions(curr);
-
ModelAction *newcurr = initialize_curr_action(curr);
+ wake_up_sleeping_actions(curr);
/* Add the action to lists before any other model-checking tasks */
if (!second_part_of_rmw)
return get_next_thread(curr);
}
-/**
- * Complete a THREAD_JOIN operation, by synchronizing with the THREAD_FINISH
- * operation from the Thread it is joining with. Must be called after the
- * completion of the Thread in question.
- * @param join The THREAD_JOIN action
- */
-void ModelChecker::do_complete_join(ModelAction *join)
-{
- Thread *blocking = (Thread *)join->get_location();
- ModelAction *act = get_last_action(blocking->get_id());
- join->synchronize_with(act);
-}
-
void ModelChecker::check_curr_backtracking(ModelAction * curr) {
Node *currnode = curr->get_node();
Node *parnode = currnode->get_parent();
if ((!parnode->backtrack_empty() ||
+ !currnode->misc_empty() ||
!currnode->read_from_empty() ||
!currnode->future_value_empty() ||
!currnode->promise_empty() ||
//do we have a pwrite for the promise, if not, set it
if (promise->get_write() == NULL ) {
promise->set_write(write);
+ //The pwrite cannot happen before the promise
+ if (write->happens_before(act) && (write != act)) {
+ failed_promise = true;
+ return;
+ }
}
if (mo_graph->checkPromise(write, promise)) {
failed_promise = true;
curr->print();
}
- if (curr->get_sleep_flag()) {
+ if (curr->get_sleep_flag() && ! curr->is_seqcst()) {
if (sleep_can_read_from(curr, act))
curr->get_node()->add_read_from(act);
} else
if (!isfeasible())
return false;
+ if (params.bound != 0) {
+ if (priv->used_sequence_numbers > params.bound) {
+ return false;
+ }
+ }
+
DEBUG("(%d, %d)\n", curr ? id_to_int(curr->get_id()) : -1,
next ? id_to_int(next->get_id()) : -1);
projects / model-checker.git / blobdiff