2 #define __STDC_FORMAT_MACROS
8 #include "clockvector.h"
11 #define ACTION_INITIAL_CLOCK 0
13 ModelAction::ModelAction(action_type_t type, memory_order order, void *loc, uint64_t value) :
19 seq_number(ACTION_INITIAL_CLOCK),
22 Thread *t = thread_current();
23 this->tid = t->get_id();
26 ModelAction::~ModelAction()
28 /** We can't free the clock vector:
29 * The reason is as follows:
30 * Clock vectors are snapshotting state... when we delete model actions
31 * they are at the end of the node list and have invalid old clock vectors...
32 * They are already free at that point...
39 void ModelAction::copy_from_new(ModelAction *newaction)
41 seq_number = newaction->seq_number;
44 void ModelAction::set_seq_number(modelclock_t num)
46 ASSERT(seq_number == ACTION_INITIAL_CLOCK);
50 bool ModelAction::is_mutex_op() const
52 return type == ATOMIC_LOCK || type == ATOMIC_TRYLOCK || type == ATOMIC_UNLOCK;
55 bool ModelAction::is_lock() const
57 return type == ATOMIC_LOCK;
60 bool ModelAction::is_unlock() const
62 return type == ATOMIC_UNLOCK;
65 bool ModelAction::is_trylock() const
67 return type == ATOMIC_TRYLOCK;
70 bool ModelAction::is_success_lock() const
72 return type == ATOMIC_LOCK || (type == ATOMIC_TRYLOCK && value == VALUE_TRYSUCCESS);
75 bool ModelAction::is_failed_trylock() const
77 return (type == ATOMIC_TRYLOCK && value == VALUE_TRYFAILED);
80 bool ModelAction::is_read() const
82 return type == ATOMIC_READ || type == ATOMIC_RMWR || type == ATOMIC_RMW;
85 bool ModelAction::is_write() const
87 return type == ATOMIC_WRITE || type == ATOMIC_RMW || type == ATOMIC_INIT;
90 bool ModelAction::is_rmwr() const
92 return type == ATOMIC_RMWR;
95 bool ModelAction::is_rmw() const
97 return type == ATOMIC_RMW;
100 bool ModelAction::is_rmwc() const
102 return type == ATOMIC_RMWC;
105 bool ModelAction::is_fence() const
107 return type == ATOMIC_FENCE;
110 bool ModelAction::is_initialization() const
112 return type == ATOMIC_INIT;
115 bool ModelAction::is_acquire() const
118 case std::memory_order_acquire:
119 case std::memory_order_acq_rel:
120 case std::memory_order_seq_cst:
127 bool ModelAction::is_release() const
130 case std::memory_order_release:
131 case std::memory_order_acq_rel:
132 case std::memory_order_seq_cst:
139 bool ModelAction::is_seqcst() const
141 return order==std::memory_order_seq_cst;
144 bool ModelAction::same_var(const ModelAction *act) const
146 return location == act->location;
149 bool ModelAction::same_thread(const ModelAction *act) const
151 return tid == act->tid;
154 void ModelAction::copy_typeandorder(ModelAction * act) {
155 this->type = act->type;
156 this->order = act->order;
159 /** This method changes an existing read part of an RMW action into either:
160 * (1) a full RMW action in case of the completed write or
161 * (2) a READ action in case a failed action.
162 * @todo If the memory_order changes, we may potentially need to update our
165 void ModelAction::process_rmw(ModelAction * act) {
166 this->order=act->order;
168 this->type=ATOMIC_READ;
169 else if (act->is_rmw()) {
170 this->type=ATOMIC_RMW;
171 this->value=act->value;
175 /** The is_synchronizing method should only explore interleavings if:
176 * (1) the operations are seq_cst and don't commute or
177 * (2) the reordering may establish or break a synchronization relation.
178 * Other memory operations will be dealt with by using the reads_from
181 * @param act is the action to consider exploring a reordering.
182 * @return tells whether we have to explore a reordering.
184 bool ModelAction::is_synchronizing(const ModelAction *act) const
186 //Same thread can't be reordered
187 if (same_thread(act))
190 // Different locations commute
194 // Explore interleavings of seqcst writes to guarantee total order
195 // of seq_cst operations that don't commute
196 if (is_write() && is_seqcst() && act->is_write() && act->is_seqcst())
199 // Explore synchronizing read/write pairs
200 if (is_read() && is_acquire() && act->is_write() && act->is_release())
202 if (is_write() && is_release() && act->is_read() && act->is_acquire())
205 // Otherwise handle by reads_from relation
209 bool ModelAction::is_conflicting_lock(const ModelAction *act) const
211 //Must be different threads to reorder
212 if (same_thread(act))
215 //Try to reorder a lock past a successful lock
216 if (act->is_success_lock())
219 //Try to push a successful trylock past an unlock
220 if (act->is_unlock() && is_trylock() && value == VALUE_TRYSUCCESS)
227 * Create a new clock vector for this action. Note that this function allows a
228 * user to clobber (and leak) a ModelAction's existing clock vector. A user
229 * should ensure that the vector has already either been rolled back
230 * (effectively "freed") or freed.
232 * @param parent A ModelAction from which to inherit a ClockVector
234 void ModelAction::create_cv(const ModelAction *parent)
237 cv = new ClockVector(parent->cv, this);
239 cv = new ClockVector(NULL, this);
242 void ModelAction::set_try_lock(bool obtainedlock) {
244 value=VALUE_TRYSUCCESS;
246 value=VALUE_TRYFAILED;
249 /** Update the model action's read_from action */
250 void ModelAction::read_from(const ModelAction *act)
254 if (act != NULL && this->is_acquire()) {
255 rel_heads_list_t release_heads;
256 model->get_release_seq_heads(this, &release_heads);
257 for (unsigned int i = 0; i < release_heads.size(); i++)
258 if (!synchronize_with(release_heads[i]))
259 model->set_bad_synchronization();
264 * Synchronize the current thread with the thread corresponding to the
265 * ModelAction parameter.
266 * @param act The ModelAction to synchronize with
267 * @return True if this is a valid synchronization; false otherwise
269 bool ModelAction::synchronize_with(const ModelAction *act) {
270 if (*this < *act && type != THREAD_JOIN && type != ATOMIC_LOCK)
272 model->check_promises(cv, act->cv);
277 bool ModelAction::has_synchronized_with(const ModelAction *act) const
279 return cv->has_synchronized_with(act->cv);
283 * Check whether 'this' happens before act, according to the memory-model's
284 * happens before relation. This is checked via the ClockVector constructs.
285 * @return true if this action's thread has synchronized with act's thread
286 * since the execution of act, false otherwise.
288 bool ModelAction::happens_before(const ModelAction *act) const
290 return act->cv->synchronized_since(this);
294 * Print nicely-formatted info about this ModelAction
296 * @param print_cv True if we want to print clock vector data. Might be false,
297 * for instance, in situations where the clock vector might be invalid
299 void ModelAction::print(bool print_cv) const
301 const char *type_str, *mo_str;
302 switch (this->type) {
304 type_str = "thread create";
307 type_str = "thread start";
310 type_str = "thread yield";
313 type_str = "thread join";
316 type_str = "thread finish";
319 type_str = "atomic read";
322 type_str = "atomic write";
325 type_str = "atomic rmw";
331 type_str = "atomic rmwr";
334 type_str = "atomic rmwc";
337 type_str = "init atomic";
346 type_str = "trylock";
349 type_str = "unknown type";
352 uint64_t valuetoprint=type==ATOMIC_READ?(reads_from!=NULL?reads_from->value:VALUE_NONE):value;
354 switch (this->order) {
355 case std::memory_order_relaxed:
358 case std::memory_order_acquire:
361 case std::memory_order_release:
364 case std::memory_order_acq_rel:
367 case std::memory_order_seq_cst:
375 printf("(%3d) Thread: %-2d Action: %-13s MO: %7s Loc: %14p Value: %-12" PRIu64,
376 seq_number, id_to_int(tid), type_str, mo_str, location, valuetoprint);
379 printf(" Rf: %d", reads_from->get_seq_number());
383 if (cv && print_cv) {