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()
32 void ModelAction::copy_from_new(ModelAction *newaction)
34 seq_number = newaction->seq_number;
37 void ModelAction::set_seq_number(modelclock_t num)
39 ASSERT(seq_number == ACTION_INITIAL_CLOCK);
43 bool ModelAction::is_mutex_op() const
45 return type == ATOMIC_LOCK || type == ATOMIC_TRYLOCK || type == ATOMIC_UNLOCK;
48 bool ModelAction::is_lock() const
50 return type == ATOMIC_LOCK;
53 bool ModelAction::is_unlock() const
55 return type == ATOMIC_UNLOCK;
58 bool ModelAction::is_trylock() const
60 return type == ATOMIC_TRYLOCK;
63 bool ModelAction::is_success_lock() const
65 return type == ATOMIC_LOCK || (type == ATOMIC_TRYLOCK && value == VALUE_TRYSUCCESS);
68 bool ModelAction::is_failed_trylock() const
70 return (type == ATOMIC_TRYLOCK && value == VALUE_TRYFAILED);
73 bool ModelAction::is_read() const
75 return type == ATOMIC_READ || type == ATOMIC_RMWR || type == ATOMIC_RMW;
78 bool ModelAction::is_write() const
80 return type == ATOMIC_WRITE || type == ATOMIC_RMW || type == ATOMIC_INIT;
83 bool ModelAction::is_rmwr() const
85 return type == ATOMIC_RMWR;
88 bool ModelAction::is_rmw() const
90 return type == ATOMIC_RMW;
93 bool ModelAction::is_rmwc() const
95 return type == ATOMIC_RMWC;
98 bool ModelAction::is_fence() const
100 return type == ATOMIC_FENCE;
103 bool ModelAction::is_initialization() const
105 return type == ATOMIC_INIT;
108 bool ModelAction::is_acquire() const
111 case std::memory_order_acquire:
112 case std::memory_order_acq_rel:
113 case std::memory_order_seq_cst:
120 bool ModelAction::is_release() const
123 case std::memory_order_release:
124 case std::memory_order_acq_rel:
125 case std::memory_order_seq_cst:
132 bool ModelAction::is_seqcst() const
134 return order==std::memory_order_seq_cst;
137 bool ModelAction::same_var(const ModelAction *act) const
139 return location == act->location;
142 bool ModelAction::same_thread(const ModelAction *act) const
144 return tid == act->tid;
147 void ModelAction::copy_typeandorder(ModelAction * act) {
148 this->type = act->type;
149 this->order = act->order;
152 /** This method changes an existing read part of an RMW action into either:
153 * (1) a full RMW action in case of the completed write or
154 * (2) a READ action in case a failed action.
155 * @todo If the memory_order changes, we may potentially need to update our
158 void ModelAction::process_rmw(ModelAction * act) {
159 this->order=act->order;
161 this->type=ATOMIC_READ;
162 else if (act->is_rmw()) {
163 this->type=ATOMIC_RMW;
164 this->value=act->value;
168 /** The is_synchronizing method should only explore interleavings if:
169 * (1) the operations are seq_cst and don't commute or
170 * (2) the reordering may establish or break a synchronization relation.
171 * Other memory operations will be dealt with by using the reads_from
174 * @param act is the action to consider exploring a reordering.
175 * @return tells whether we have to explore a reordering.
177 bool ModelAction::is_synchronizing(const ModelAction *act) const
179 //Same thread can't be reordered
180 if (same_thread(act))
183 // Different locations commute
187 // Explore interleavings of seqcst writes to guarantee total order
188 // of seq_cst operations that don't commute
189 if (is_write() && is_seqcst() && act->is_write() && act->is_seqcst())
192 // Explore synchronizing read/write pairs
193 if (is_read() && is_acquire() && act->is_write() && act->is_release())
195 if (is_write() && is_release() && act->is_read() && act->is_acquire())
198 // Otherwise handle by reads_from relation
202 bool ModelAction::is_conflicting_lock(const ModelAction *act) const
204 //Must be different threads to reorder
205 if (same_thread(act))
208 //Try to reorder a lock past a successful lock
209 if (act->is_success_lock())
212 //Try to push a successful trylock past an unlock
213 if (act->is_unlock() && is_trylock() && value == VALUE_TRYSUCCESS)
220 * Create a new clock vector for this action. Note that this function allows a
221 * user to clobber (and leak) a ModelAction's existing clock vector. A user
222 * should ensure that the vector has already either been rolled back
223 * (effectively "freed") or freed.
225 * @param parent A ModelAction from which to inherit a ClockVector
227 void ModelAction::create_cv(const ModelAction *parent)
230 cv = new ClockVector(parent->cv, this);
232 cv = new ClockVector(NULL, this);
235 void ModelAction::set_try_lock(bool obtainedlock) {
237 value=VALUE_TRYSUCCESS;
239 value=VALUE_TRYFAILED;
242 /** Update the model action's read_from action */
243 void ModelAction::read_from(const ModelAction *act)
247 if (act != NULL && this->is_acquire()) {
248 rel_heads_list_t release_heads;
249 model->get_release_seq_heads(this, &release_heads);
250 for (unsigned int i = 0; i < release_heads.size(); i++)
251 if (!synchronize_with(release_heads[i]))
252 model->set_bad_synchronization();
257 * Synchronize the current thread with the thread corresponding to the
258 * ModelAction parameter.
259 * @param act The ModelAction to synchronize with
260 * @return True if this is a valid synchronization; false otherwise
262 bool ModelAction::synchronize_with(const ModelAction *act) {
263 if (*this < *act && type != THREAD_JOIN && type != ATOMIC_LOCK)
265 model->check_promises(cv, act->cv);
270 bool ModelAction::has_synchronized_with(const ModelAction *act) const
272 return cv->has_synchronized_with(act->cv);
276 * Check whether 'this' happens before act, according to the memory-model's
277 * happens before relation. This is checked via the ClockVector constructs.
278 * @return true if this action's thread has synchronized with act's thread
279 * since the execution of act, false otherwise.
281 bool ModelAction::happens_before(const ModelAction *act) const
283 return act->cv->synchronized_since(this);
287 * Print nicely-formatted info about this ModelAction
289 * @param print_cv True if we want to print clock vector data. Might be false,
290 * for instance, in situations where the clock vector might be invalid
292 void ModelAction::print(bool print_cv) const
294 const char *type_str, *mo_str;
295 switch (this->type) {
297 type_str = "thread create";
300 type_str = "thread start";
303 type_str = "thread yield";
306 type_str = "thread join";
309 type_str = "thread finish";
312 type_str = "atomic read";
315 type_str = "atomic write";
318 type_str = "atomic rmw";
324 type_str = "atomic rmwr";
327 type_str = "atomic rmwc";
330 type_str = "init atomic";
339 type_str = "trylock";
342 type_str = "unknown type";
345 uint64_t valuetoprint=type==ATOMIC_READ?(reads_from!=NULL?reads_from->value:VALUE_NONE):value;
347 switch (this->order) {
348 case std::memory_order_relaxed:
351 case std::memory_order_acquire:
354 case std::memory_order_release:
357 case std::memory_order_acq_rel:
360 case std::memory_order_seq_cst:
368 printf("(%3d) Thread: %-2d Action: %-13s MO: %7s Loc: %14p Value: %-12" PRIu64,
369 seq_number, id_to_int(tid), type_str, mo_str, location, valuetoprint);
372 printf(" Rf: %d", reads_from->get_seq_number());
376 if (cv && print_cv) {