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 #include <assert.h>
  12
  13 /* global "model" object */
  14 #include "model.h"
  15 #include "execution.h"
  16
  17 int pthread_create(pthread_t *t, const pthread_attr_t * attr,
  18                                                                          pthread_start_t start_routine, void * arg) {
  19         struct pthread_params params = { start_routine, arg };
  20
  21         ModelAction *act = new ModelAction(PTHREAD_CREATE, std::memory_order_seq_cst, t, (uint64_t)&params);
  22
  23         /* seq_cst is just a 'don't care' parameter */
  24         model->switch_to_master(act);
  25
  26         return 0;
  27 }
  28
  29 int pthread_join(pthread_t t, void **value_ptr) {
  30 //      Thread *th = model->get_pthread(t);
  31         ModelExecution *execution = model->get_execution();
  32         Thread *th = execution->get_pthread(t);
  33
  34         model->switch_to_master(new ModelAction(PTHREAD_JOIN, std::memory_order_seq_cst, th, id_to_int(th->get_id())));
  35
  36         if ( value_ptr ) {
  37                 // store return value
  38                 void *rtval = th->get_pthread_return();
  39                 *value_ptr = rtval;
  40         }
  41         return 0;
  42 }
  43
  44 void pthread_exit(void *value_ptr) {
  45         Thread * th = thread_current();
  46         model->switch_to_master(new ModelAction(THREAD_FINISH, std::memory_order_seq_cst, th));
  47         while(1) ;//make warning goaway
  48 }
  49
  50 int pthread_mutex_init(pthread_mutex_t *p_mutex, const pthread_mutexattr_t *) {
  51         if (!model) {
  52                 snapshot_system_init(10000, 1024, 1024, 40000);
  53                 model = new ModelChecker();
  54         }
  55
  56         cdsc::mutex *m = new cdsc::mutex();
  57
  58         ModelExecution *execution = model->get_execution();
  59         execution->getMutexMap()->put(p_mutex, m);
  60         return 0;
  61 }
  62
  63 int pthread_mutex_lock(pthread_mutex_t *p_mutex) {
  64         ModelExecution *execution = model->get_execution();
  65
  66         /* to protect the case where PTHREAD_MUTEX_INITIALIZER is used
  67            instead of pthread_mutex_init, or where *p_mutex is not stored
  68            in the execution->mutex_map for some reason. */
  69         if (!execution->getMutexMap()->contains(p_mutex)) {
  70                 pthread_mutex_init(p_mutex, NULL);
  71         }
  72
  73         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
  74
  75         if (m != NULL) {
  76                 m->lock();
  77         } else {
  78                 printf("ah\n");
  79         }
  80
  81         return 0;
  82 }
  83
  84 int pthread_mutex_trylock(pthread_mutex_t *p_mutex) {
  85         ModelExecution *execution = model->get_execution();
  86         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
  87         return m->try_lock();
  88 }
  89 int pthread_mutex_unlock(pthread_mutex_t *p_mutex) {
  90         ModelExecution *execution = model->get_execution();
  91         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
  92
  93         if (m != NULL) {
  94                 m->unlock();
  95         } else {
  96                 printf("try to unlock an untracked pthread_mutex\n");
  97         }
  98
  99         return 0;
 100 }
 101
 102 int pthread_mutex_timedlock (pthread_mutex_t *__restrict p_mutex,
 103                                                                                                                  const struct timespec *__restrict abstime) {
 104 // timedlock just gives the option of giving up the lock, so return and let the scheduler decide which thread goes next
 105
 106 /*
 107         ModelExecution *execution = model->get_execution();
 108         if (!execution->mutex_map.contains(p_mutex)) {
 109                 pthread_mutex_init(p_mutex, NULL);
 110         }
 111         cdsc::mutex *m = execution->mutex_map.get(p_mutex);
 112
 113         if (m != NULL) {
 114                 m->lock();
 115         } else {
 116                 printf("something is wrong with pthread_mutex_timedlock\n");
 117         }
 118
 119         printf("pthread_mutex_timedlock is called. It is currently implemented as a normal lock operation without no timeout\n");
 120  */
 121         return 0;
 122 }
 123
 124 pthread_t pthread_self() {
 125         Thread* th = model->get_current_thread();
 126         return (pthread_t)th->get_id();
 127 }
 128
 129 int pthread_key_delete(pthread_key_t) {
 130         model_print("key_delete is called\n");
 131         return 0;
 132 }
 133
 134 int pthread_cond_init(pthread_cond_t *p_cond, const pthread_condattr_t *attr) {
 135         cdsc::condition_variable *v = new cdsc::condition_variable();
 136
 137         ModelExecution *execution = model->get_execution();
 138         execution->getCondMap()->put(p_cond, v);
 139         return 0;
 140 }
 141
 142 int pthread_cond_wait(pthread_cond_t *p_cond, pthread_mutex_t *p_mutex) {
 143         ModelExecution *execution = model->get_execution();
 144         if ( !execution->getCondMap()->contains(p_cond) )
 145                 pthread_cond_init(p_cond, NULL);
 146
 147         cdsc::condition_variable *v = execution->getCondMap()->get(p_cond);
 148         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
 149
 150         v->wait(*m);
 151         return 0;
 152 }
 153
 154 int pthread_cond_timedwait(pthread_cond_t *p_cond,
 155                                                                                                          pthread_mutex_t *p_mutex, const struct timespec *abstime) {
 156 // implement cond_timedwait as a noop and let the scheduler decide which thread goes next
 157         ModelExecution *execution = model->get_execution();
 158
 159         if ( !execution->getCondMap()->contains(p_cond) )
 160                 pthread_cond_init(p_cond, NULL);
 161         if ( !execution->getMutexMap()->contains(p_mutex) )
 162                 pthread_mutex_init(p_mutex, NULL);
 163
 164         cdsc::condition_variable *v = execution->getCondMap()->get(p_cond);
 165         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
 166
 167         model->switch_to_master(new ModelAction(NOOP, std::memory_order_seq_cst, v));
 168 //      v->wait(*m);
 169 //      printf("timed_wait called\n");
 170         return 0;
 171 }
 172
 173 int pthread_cond_signal(pthread_cond_t *p_cond) {
 174         // notify only one blocked thread
 175         ModelExecution *execution = model->get_execution();
 176         if ( !execution->getCondMap()->contains(p_cond) )
 177                 pthread_cond_init(p_cond, NULL);
 178
 179         cdsc::condition_variable *v = execution->getCondMap()->get(p_cond);
 180
 181         v->notify_one();
 182         return 0;
 183 }