#include "clockvector.h"
#include "common.h"
+#define ACTION_INITIAL_CLOCK 0
+
ModelAction::ModelAction(action_type_t type, memory_order order, void *loc, uint64_t value) :
type(type),
order(order),
location(loc),
value(value),
reads_from(NULL),
+ seq_number(ACTION_INITIAL_CLOCK),
cv(NULL)
{
Thread *t = thread_current();
this->tid = t->get_id();
- this->seq_number = model->get_next_seq_num();
}
ModelAction::~ModelAction()
{
- if (cv)
- delete cv;
+ /** We can't free the clock vector:
+ * The reason is as follows:
+ * Clock vectors are snapshotting state... when we delete model actions
+ * they are at the end of the node list and have invalid old clock vectors...
+ * They are already free at that point...
+ */
+
+ /* if (cv)
+ delete cv;*/
+}
+
+void ModelAction::copy_from_new(ModelAction *newaction)
+{
+ seq_number = newaction->seq_number;
+}
+
+void ModelAction::set_seq_number(modelclock_t num)
+{
+ ASSERT(seq_number == ACTION_INITIAL_CLOCK);
+ seq_number = num;
+}
+
+bool ModelAction::is_mutex_op() const
+{
+ return type == ATOMIC_LOCK || type == ATOMIC_TRYLOCK || type == ATOMIC_UNLOCK;
+}
+
+bool ModelAction::is_lock() const
+{
+ return type == ATOMIC_LOCK;
+}
+
+bool ModelAction::is_unlock() const
+{
+ return type == ATOMIC_UNLOCK;
+}
+
+bool ModelAction::is_trylock() const
+{
+ return type == ATOMIC_TRYLOCK;
+}
+
+bool ModelAction::is_success_lock() const
+{
+ return type == ATOMIC_LOCK || (type == ATOMIC_TRYLOCK && value == VALUE_TRYSUCCESS);
+}
+
+bool ModelAction::is_failed_trylock() const
+{
+ return (type == ATOMIC_TRYLOCK && value == VALUE_TRYFAILED);
}
bool ModelAction::is_read() const
}
void ModelAction::copy_typeandorder(ModelAction * act) {
- this->type=act->type;
- this->order=act->order;
+ this->type = act->type;
+ this->order = act->order;
}
/** This method changes an existing read part of an RMW action into either:
return false;
}
-void ModelAction::create_cv(const ModelAction *parent)
+bool ModelAction::is_conflicting_lock(const ModelAction *act) const
{
- if (cv)
- delete cv;
+ //Must be different threads to reorder
+ if (same_thread(act))
+ return false;
+
+ //Try to reorder a lock past a successful lock
+ if (act->is_success_lock())
+ return true;
+
+ //Try to push a successful trylock past an unlock
+ if (act->is_unlock() && is_trylock() && value == VALUE_TRYSUCCESS)
+ return true;
+ return false;
+}
+
+/**
+ * Create a new clock vector for this action. Note that this function allows a
+ * user to clobber (and leak) a ModelAction's existing clock vector. A user
+ * should ensure that the vector has already either been rolled back
+ * (effectively "freed") or freed.
+ *
+ * @param parent A ModelAction from which to inherit a ClockVector
+ */
+void ModelAction::create_cv(const ModelAction *parent)
+{
if (parent)
cv = new ClockVector(parent->cv, this);
else
cv = new ClockVector(NULL, this);
}
+void ModelAction::set_try_lock(bool obtainedlock) {
+ if (obtainedlock)
+ value=VALUE_TRYSUCCESS;
+ else
+ value=VALUE_TRYFAILED;
+}
+
/** Update the model action's read_from action */
void ModelAction::read_from(const ModelAction *act)
{
ASSERT(cv);
reads_from = act;
if (act != NULL && this->is_acquire()) {
- std::vector< const ModelAction *, MyAlloc<const ModelAction *> > release_heads;
+ rel_heads_list_t release_heads;
model->get_release_seq_heads(this, &release_heads);
for (unsigned int i = 0; i < release_heads.size(); i++)
- synchronize_with(release_heads[i]);
+ if (!synchronize_with(release_heads[i]))
+ model->set_bad_synchronization();
}
}
* Synchronize the current thread with the thread corresponding to the
* ModelAction parameter.
* @param act The ModelAction to synchronize with
+ * @return True if this is a valid synchronization; false otherwise
*/
-void ModelAction::synchronize_with(const ModelAction *act) {
- ASSERT(*act < *this || type == THREAD_JOIN);
+bool ModelAction::synchronize_with(const ModelAction *act) {
+ if (*this < *act && type != THREAD_JOIN && type != ATOMIC_LOCK)
+ return false;
model->check_promises(cv, act->cv);
cv->merge(act->cv);
+ return true;
}
bool ModelAction::has_synchronized_with(const ModelAction *act) const
return act->cv->synchronized_since(this);
}
-void ModelAction::print(void) const
+/**
+ * Print nicely-formatted info about this ModelAction
+ *
+ * @param print_cv True if we want to print clock vector data. Might be false,
+ * for instance, in situations where the clock vector might be invalid
+ */
+void ModelAction::print(bool print_cv) const
{
const char *type_str, *mo_str;
switch (this->type) {
case ATOMIC_INIT:
type_str = "init atomic";
break;
+ case ATOMIC_LOCK:
+ type_str = "lock";
+ break;
+ case ATOMIC_UNLOCK:
+ type_str = "unlock";
+ break;
+ case ATOMIC_TRYLOCK:
+ type_str = "trylock";
+ break;
default:
type_str = "unknown type";
}
else
printf(" Rf: ?");
}
- if (cv) {
+ if (cv && print_cv) {
printf("\t");
cv->print();
} else
projects / model-checker.git / blobdiff