pthread.cc

   1 #include "common.h"
   2 #include "threads-model.h"
   3 #include "action.h"
   4 #include "mypthread.h"
   5
   6 #include "snapshot-interface.h"
   7 #include "datarace.h"
   8
   9 #include "mutex.h"
  10 #include <condition_variable>
  11
  12 /* global "model" object */
  13 #include "model.h"
  14 #include "execution.h"
  15 #include <errno.h>
  16
  17 int pthread_create(pthread_t *t, const pthread_attr_t * attr,
  18                                                                          pthread_start_t start_routine, void * arg) {
  19         if (!model) {
  20                 snapshot_system_init(10000, 1024, 1024, 40000);
  21                 model = new ModelChecker();
  22                 model->startChecker();
  23         }
  24
  25         struct pthread_params params = { start_routine, arg };
  26
  27         /* seq_cst is just a 'don't care' parameter */
  28         model->switch_to_master(new ModelAction(PTHREAD_CREATE, std::memory_order_seq_cst, t, (uint64_t)&params));
  29
  30         return 0;
  31 }
  32
  33 int pthread_join(pthread_t t, void **value_ptr) {
  34         ModelExecution *execution = model->get_execution();
  35         Thread *th = execution->get_pthread(t);
  36
  37         model->switch_to_master(new ModelAction(PTHREAD_JOIN, std::memory_order_seq_cst, th, id_to_int(th->get_id())));
  38
  39         if ( value_ptr ) {
  40                 // store return value
  41                 void *rtval = th->get_pthread_return();
  42                 *value_ptr = rtval;
  43         }
  44         return 0;
  45 }
  46
  47 int pthread_detach(pthread_t t) {
  48         //Doesn't do anything
  49         //Return success
  50         return 0;
  51 }
  52
  53 /* Take care of both pthread_yield and c++ thread yield */
  54 int sched_yield() {
  55         model->switch_thread(new ModelAction(THREAD_YIELD, std::memory_order_seq_cst, thread_current(), VALUE_NONE));
  56         return 0;
  57 }
  58
  59 void pthread_exit(void *value_ptr) {
  60         Thread * th = thread_current();
  61         th->set_pthread_return(value_ptr);
  62         model->switch_to_master(new ModelAction(THREADONLY_FINISH, std::memory_order_seq_cst, th));
  63         //Need to exit so we don't return to the program
  64         real_pthread_exit(NULL);
  65 }
  66
  67 int pthread_mutex_init(pthread_mutex_t *p_mutex, const pthread_mutexattr_t *) {
  68         if (!model) {
  69                 snapshot_system_init(10000, 1024, 1024, 40000);
  70                 model = new ModelChecker();
  71                 model->startChecker();
  72         }
  73         cdsc::snapmutex *m = new cdsc::snapmutex();
  74
  75         ModelExecution *execution = model->get_execution();
  76         execution->getMutexMap()->put(p_mutex, m);
  77
  78         return 0;
  79 }
  80
  81 int pthread_mutex_lock(pthread_mutex_t *p_mutex) {
  82         if (!model) {
  83                 snapshot_system_init(10000, 1024, 1024, 40000);
  84                 model = new ModelChecker();
  85                 model->startChecker();
  86         }
  87
  88         ModelExecution *execution = model->get_execution();
  89
  90         /* to protect the case where PTHREAD_MUTEX_INITIALIZER is used
  91            instead of pthread_mutex_init, or where *p_mutex is not stored
  92            in the execution->mutex_map for some reason. */
  93         if (!execution->getMutexMap()->contains(p_mutex)) {
  94                 pthread_mutex_init(p_mutex, NULL);
  95         }
  96
  97         cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
  98
  99         if (m != NULL) {
 100                 m->lock();
 101         } else {
 102                 return 1;
 103         }
 104
 105         return 0;
 106 }
 107
 108 int pthread_mutex_trylock(pthread_mutex_t *p_mutex) {
 109         if (!model) {
 110                 snapshot_system_init(10000, 1024, 1024, 40000);
 111                 model = new ModelChecker();
 112                 model->startChecker();
 113         }
 114
 115         ModelExecution *execution = model->get_execution();
 116         cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
 117         return m->try_lock();
 118 }
 119 int pthread_mutex_unlock(pthread_mutex_t *p_mutex) {
 120         ModelExecution *execution = model->get_execution();
 121         cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
 122
 123         if (m != NULL) {
 124                 m->unlock();
 125         } else {
 126                 printf("try to unlock an untracked pthread_mutex\n");
 127                 return 1;
 128         }
 129
 130         return 0;
 131 }
 132
 133 int pthread_mutex_timedlock (pthread_mutex_t *__restrict p_mutex,
 134                                                                                                                  const struct timespec *__restrict abstime) {
 135 // timedlock just gives the option of giving up the lock, so return and let the scheduler decide which thread goes next
 136
 137         if (!model) {
 138                 snapshot_system_init(10000, 1024, 1024, 40000);
 139                 model = new ModelChecker();
 140                 model->startChecker();
 141         }
 142
 143         ModelExecution *execution = model->get_execution();
 144
 145         /* to protect the case where PTHREAD_MUTEX_INITIALIZER is used
 146            instead of pthread_mutex_init, or where *p_mutex is not stored
 147            in the execution->mutex_map for some reason. */
 148         if (!execution->getMutexMap()->contains(p_mutex)) {
 149                 pthread_mutex_init(p_mutex, NULL);
 150         }
 151
 152         cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
 153
 154         if (m != NULL) {
 155                 m->lock();
 156                 return 0;
 157         }
 158
 159         return 1;
 160 }
 161
 162 pthread_t pthread_self() {
 163         Thread* th = model->get_current_thread();
 164         return (pthread_t)th->get_id();
 165 }
 166
 167 int pthread_key_delete(pthread_key_t) {
 168         model_print("key_delete is called\n");
 169         return 0;
 170 }
 171
 172 int pthread_cond_init(pthread_cond_t *p_cond, const pthread_condattr_t *attr) {
 173         cdsc::snapcondition_variable *v = new cdsc::snapcondition_variable();
 174
 175         ModelExecution *execution = model->get_execution();
 176         execution->getCondMap()->put(p_cond, v);
 177         return 0;
 178 }
 179
 180 int pthread_cond_wait(pthread_cond_t *p_cond, pthread_mutex_t *p_mutex) {
 181         ModelExecution *execution = model->get_execution();
 182         if ( !execution->getCondMap()->contains(p_cond) )
 183                 pthread_cond_init(p_cond, NULL);
 184         if ( !execution->getMutexMap()->contains(p_mutex) )
 185                 pthread_mutex_init(p_mutex, NULL);
 186
 187         cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
 188         cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
 189
 190         v->wait(*m);
 191         return 0;
 192 }
 193
 194 int pthread_cond_timedwait(pthread_cond_t *p_cond,
 195                                                                                                          pthread_mutex_t *p_mutex, const struct timespec *abstime) {
 196         ModelExecution *execution = model->get_execution();
 197
 198         if ( !execution->getCondMap()->contains(p_cond) )
 199                 pthread_cond_init(p_cond, NULL);
 200         if ( !execution->getMutexMap()->contains(p_mutex) )
 201                 pthread_mutex_init(p_mutex, NULL);
 202
 203         cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
 204         cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
 205
 206         model->switch_thread(new ModelAction(ATOMIC_TIMEDWAIT, std::memory_order_seq_cst, v, (uint64_t) m));
 207         m->lock();
 208
 209         // model_print("Timed_wait is called\n");
 210         return 0;
 211 }
 212
 213 int pthread_cond_signal(pthread_cond_t *p_cond) {
 214         // notify only one blocked thread
 215         ModelExecution *execution = model->get_execution();
 216         if ( !execution->getCondMap()->contains(p_cond) )
 217                 pthread_cond_init(p_cond, NULL);
 218
 219         cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
 220
 221         v->notify_one();
 222         return 0;
 223 }
 224
 225 int pthread_cond_broadcast(pthread_cond_t *p_cond) {
 226         // notify all blocked threads
 227         ModelExecution *execution = model->get_execution();
 228         if ( !execution->getCondMap()->contains(p_cond) )
 229                 pthread_cond_init(p_cond, NULL);
 230
 231         cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
 232
 233         v->notify_all();
 234         return 0;
 235 }
 236
 237 int pthread_cond_destroy(pthread_cond_t *p_cond) {
 238         ModelExecution *execution = model->get_execution();
 239
 240         if (execution->getCondMap()->contains(p_cond)) {
 241                 cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
 242                 delete v;
 243                 execution->getCondMap()->remove(p_cond);
 244         }
 245         return 0;
 246 }