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 extern "C" {
  16 int nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
  17 }
  18
  19 int nanosleep(const struct timespec *rqtp, struct timespec *rmtp) {
  20         if (model) {
  21                 uint64_t time = rqtp->tv_sec * 1000000000 + rqtp->tv_nsec;
  22                 struct timespec currtime;
  23                 clock_gettime(CLOCK_MONOTONIC, &currtime);
  24                 uint64_t lcurrtime = currtime.tv_sec * 1000000000 + currtime.tv_nsec;
  25                 model->switch_to_master(new ModelAction(THREAD_SLEEP, std::memory_order_seq_cst, time, lcurrtime));
  26                 if (rmtp != NULL) {
  27                         clock_gettime(CLOCK_MONOTONIC, &currtime);
  28                         uint64_t lendtime = currtime.tv_sec * 1000000000 + currtime.tv_nsec;
  29                         uint64_t elapsed = lendtime - lcurrtime;
  30                         rmtp->tv_sec = elapsed / 1000000000;
  31                         rmtp->tv_nsec = elapsed - rmtp->tv_sec * 1000000000;
  32                 }
  33         }
  34         return 0;
  35 }
  36
  37 int pthread_create(pthread_t *t, const pthread_attr_t * attr,
  38                                                                          pthread_start_t start_routine, void * arg) {
  39         if (!model) {
  40                 snapshot_system_init(10000, 1024, 1024, 40000);
  41                 model = new ModelChecker();
  42                 model->startChecker();
  43         }
  44
  45         struct pthread_params params = { start_routine, arg };
  46
  47         ModelAction *act = new ModelAction(PTHREAD_CREATE, std::memory_order_seq_cst, t, (uint64_t)&params);
  48
  49         /* seq_cst is just a 'don't care' parameter */
  50         model->switch_to_master(act);
  51
  52         return 0;
  53 }
  54
  55 int pthread_join(pthread_t t, void **value_ptr) {
  56         ModelExecution *execution = model->get_execution();
  57         Thread *th = execution->get_pthread(t);
  58
  59         model->switch_to_master(new ModelAction(PTHREAD_JOIN, std::memory_order_seq_cst, th, id_to_int(th->get_id())));
  60
  61         if ( value_ptr ) {
  62                 // store return value
  63                 void *rtval = th->get_pthread_return();
  64                 *value_ptr = rtval;
  65         }
  66         return 0;
  67 }
  68
  69 int pthread_detach(pthread_t t) {
  70         //Doesn't do anything
  71         //Return success
  72         return 0;
  73 }
  74
  75 void pthread_exit(void *value_ptr) {
  76         Thread * th = thread_current();
  77         th->set_pthread_return(value_ptr);
  78         model->switch_to_master(new ModelAction(THREADONLY_FINISH, std::memory_order_seq_cst, th));
  79         //Need to exit so we don't return to the program
  80         real_pthread_exit(NULL);
  81 }
  82
  83 int pthread_mutex_init(pthread_mutex_t *p_mutex, const pthread_mutexattr_t *) {
  84         if (!model) {
  85                 snapshot_system_init(10000, 1024, 1024, 40000);
  86                 model = new ModelChecker();
  87                 model->startChecker();
  88         }
  89         cdsc::snapmutex *m = new cdsc::snapmutex();
  90
  91         ModelExecution *execution = model->get_execution();
  92         execution->getMutexMap()->put(p_mutex, m);
  93
  94         return 0;
  95 }
  96
  97 int pthread_mutex_lock(pthread_mutex_t *p_mutex) {
  98         if (!model) {
  99                 snapshot_system_init(10000, 1024, 1024, 40000);
 100                 model = new ModelChecker();
 101                 model->startChecker();
 102         }
 103
 104         ModelExecution *execution = model->get_execution();
 105
 106         /* to protect the case where PTHREAD_MUTEX_INITIALIZER is used
 107            instead of pthread_mutex_init, or where *p_mutex is not stored
 108            in the execution->mutex_map for some reason. */
 109         if (!execution->getMutexMap()->contains(p_mutex)) {
 110                 pthread_mutex_init(p_mutex, NULL);
 111         }
 112
 113         cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
 114
 115         if (m != NULL) {
 116                 m->lock();
 117         } else {
 118                 printf("ah\n");
 119         }
 120
 121         return 0;
 122 }
 123
 124 int pthread_mutex_trylock(pthread_mutex_t *p_mutex) {
 125         if (!model) {
 126                 snapshot_system_init(10000, 1024, 1024, 40000);
 127                 model = new ModelChecker();
 128                 model->startChecker();
 129         }
 130
 131         ModelExecution *execution = model->get_execution();
 132         cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
 133         return m->try_lock();
 134 }
 135 int pthread_mutex_unlock(pthread_mutex_t *p_mutex) {
 136         ModelExecution *execution = model->get_execution();
 137         cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
 138
 139         if (m != NULL) {
 140                 m->unlock();
 141         } else {
 142                 printf("try to unlock an untracked pthread_mutex\n");
 143         }
 144
 145         return 0;
 146 }
 147
 148 int pthread_mutex_timedlock (pthread_mutex_t *__restrict p_mutex,
 149                                                                                                                  const struct timespec *__restrict abstime) {
 150 // timedlock just gives the option of giving up the lock, so return and let the scheduler decide which thread goes next
 151
 152 /*
 153         ModelExecution *execution = model->get_execution();
 154         if (!execution->mutex_map.contains(p_mutex)) {
 155                 pthread_mutex_init(p_mutex, NULL);
 156         }
 157         cdsc::snapmutex *m = execution->mutex_map.get(p_mutex);
 158
 159         if (m != NULL) {
 160                 m->lock();
 161         } else {
 162                 printf("something is wrong with pthread_mutex_timedlock\n");
 163         }
 164
 165         printf("pthread_mutex_timedlock is called. It is currently implemented as a normal lock operation without no timeout\n");
 166  */
 167         return 0;
 168 }
 169
 170 pthread_t pthread_self() {
 171         Thread* th = model->get_current_thread();
 172         return (pthread_t)th->get_id();
 173 }
 174
 175 int pthread_key_delete(pthread_key_t) {
 176         model_print("key_delete is called\n");
 177         return 0;
 178 }
 179
 180 int pthread_cond_init(pthread_cond_t *p_cond, const pthread_condattr_t *attr) {
 181         cdsc::snapcondition_variable *v = new cdsc::snapcondition_variable();
 182
 183         ModelExecution *execution = model->get_execution();
 184         execution->getCondMap()->put(p_cond, v);
 185         return 0;
 186 }
 187
 188 int pthread_cond_wait(pthread_cond_t *p_cond, pthread_mutex_t *p_mutex) {
 189         ModelExecution *execution = model->get_execution();
 190         if ( !execution->getCondMap()->contains(p_cond) )
 191                 pthread_cond_init(p_cond, NULL);
 192         if ( !execution->getMutexMap()->contains(p_mutex) )
 193                 pthread_mutex_init(p_mutex, NULL);
 194
 195         cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
 196         cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
 197
 198         v->wait(*m);
 199         return 0;
 200 }
 201
 202 int pthread_cond_timedwait(pthread_cond_t *p_cond,
 203         pthread_mutex_t *p_mutex, const struct timespec *abstime) {
 204         ModelExecution *execution = model->get_execution();
 205
 206         if ( !execution->getCondMap()->contains(p_cond) )
 207                 pthread_cond_init(p_cond, NULL);
 208         if ( !execution->getMutexMap()->contains(p_mutex) )
 209                 pthread_mutex_init(p_mutex, NULL);
 210
 211         cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
 212         cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
 213
 214         model->switch_to_master(new ModelAction(ATOMIC_TIMEDWAIT, std::memory_order_seq_cst, v, (uint64_t) m));
 215         m->lock();
 216
 217         // model_print("Timed_wait is called\n");
 218         return 0;
 219 }
 220
 221 int pthread_cond_signal(pthread_cond_t *p_cond) {
 222         // notify only one blocked thread
 223         ModelExecution *execution = model->get_execution();
 224         if ( !execution->getCondMap()->contains(p_cond) )
 225                 pthread_cond_init(p_cond, NULL);
 226
 227         cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
 228
 229         v->notify_one();
 230         return 0;
 231 }
 232
 233 int pthread_cond_broadcast(pthread_cond_t *p_cond) {
 234         // notify all blocked threads
 235         ModelExecution *execution = model->get_execution();
 236         if ( !execution->getCondMap()->contains(p_cond) )
 237                 pthread_cond_init(p_cond, NULL);
 238
 239         cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
 240
 241         v->notify_all();
 242         return 0;
 243 }
 244
 245 int pthread_cond_destroy(pthread_cond_t *p_cond) {
 246         ModelExecution *execution = model->get_execution();
 247
 248         if (execution->getCondMap()->contains(p_cond)) {
 249                 cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
 250                 delete v;
 251                 execution->getCondMap()->remove(p_cond);
 252         }
 253         return 0;
 254 }