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                 model = new ModelChecker();
  53         }
  54
  55         cdsc::mutex *m = new cdsc::mutex();
  56
  57         ModelExecution *execution = model->get_execution();
  58         execution->getMutexMap()->put(p_mutex, m);
  59         return 0;
  60 }
  61
  62 int pthread_mutex_lock(pthread_mutex_t *p_mutex) {
  63         ModelExecution *execution = model->get_execution();
  64
  65         /* to protect the case where PTHREAD_MUTEX_INITIALIZER is used
  66            instead of pthread_mutex_init, or where *p_mutex is not stored
  67            in the execution->mutex_map for some reason. */
  68         if (!execution->getMutexMap()->contains(p_mutex)) {
  69                 pthread_mutex_init(p_mutex, NULL);
  70         }
  71
  72         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
  73
  74         if (m != NULL) {
  75                 m->lock();
  76         } else {
  77                 printf("ah\n");
  78         }
  79
  80         return 0;
  81 }
  82
  83 int pthread_mutex_trylock(pthread_mutex_t *p_mutex) {
  84         ModelExecution *execution = model->get_execution();
  85         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
  86         return m->try_lock();
  87 }
  88 int pthread_mutex_unlock(pthread_mutex_t *p_mutex) {
  89         ModelExecution *execution = model->get_execution();
  90         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
  91
  92         if (m != NULL) {
  93                 m->unlock();
  94         } else {
  95                 printf("try to unlock an untracked pthread_mutex\n");
  96         }
  97
  98         return 0;
  99 }
 100
 101 int pthread_mutex_timedlock (pthread_mutex_t *__restrict p_mutex,
 102                                                                                                                  const struct timespec *__restrict abstime) {
 103 // timedlock just gives the option of giving up the lock, so return and let the scheduler decide which thread goes next
 104
 105 /*
 106         ModelExecution *execution = model->get_execution();
 107         if (!execution->mutex_map.contains(p_mutex)) {
 108                 pthread_mutex_init(p_mutex, NULL);
 109         }
 110         cdsc::mutex *m = execution->mutex_map.get(p_mutex);
 111
 112         if (m != NULL) {
 113                 m->lock();
 114         } else {
 115                 printf("something is wrong with pthread_mutex_timedlock\n");
 116         }
 117
 118         printf("pthread_mutex_timedlock is called. It is currently implemented as a normal lock operation without no timeout\n");
 119  */
 120         return 0;
 121 }
 122
 123 pthread_t pthread_self() {
 124         Thread* th = model->get_current_thread();
 125         return (pthread_t)th->get_id();
 126 }
 127
 128 int pthread_key_delete(pthread_key_t) {
 129         model_print("key_delete is called\n");
 130         return 0;
 131 }
 132
 133 int pthread_cond_init(pthread_cond_t *p_cond, const pthread_condattr_t *attr) {
 134         cdsc::condition_variable *v = new cdsc::condition_variable();
 135
 136         ModelExecution *execution = model->get_execution();
 137         execution->getCondMap()->put(p_cond, v);
 138         return 0;
 139 }
 140
 141 int pthread_cond_wait(pthread_cond_t *p_cond, pthread_mutex_t *p_mutex) {
 142         ModelExecution *execution = model->get_execution();
 143         if ( !execution->getCondMap()->contains(p_cond) )
 144                 pthread_cond_init(p_cond, NULL);
 145
 146         cdsc::condition_variable *v = execution->getCondMap()->get(p_cond);
 147         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
 148
 149         v->wait(*m);
 150         return 0;
 151 }
 152
 153 int pthread_cond_timedwait(pthread_cond_t *p_cond,
 154                                                                                                          pthread_mutex_t *p_mutex, const struct timespec *abstime) {
 155 // implement cond_timedwait as a noop and let the scheduler decide which thread goes next
 156         ModelExecution *execution = model->get_execution();
 157
 158         if ( !execution->getCondMap()->contains(p_cond) )
 159                 pthread_cond_init(p_cond, NULL);
 160         if ( !execution->getMutexMap()->contains(p_mutex) )
 161                 pthread_mutex_init(p_mutex, NULL);
 162
 163         cdsc::condition_variable *v = execution->getCondMap()->get(p_cond);
 164         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
 165
 166         model->switch_to_master(new ModelAction(NOOP, std::memory_order_seq_cst, v));
 167 //      v->wait(*m);
 168 //      printf("timed_wait called\n");
 169         return 0;
 170 }
 171
 172 int pthread_cond_signal(pthread_cond_t *p_cond) {
 173         // notify only one blocked thread
 174         ModelExecution *execution = model->get_execution();
 175         if ( !execution->getCondMap()->contains(p_cond) )
 176                 pthread_cond_init(p_cond, NULL);
 177
 178         cdsc::condition_variable *v = execution->getCondMap()->get(p_cond);
 179
 180         v->notify_one();
 181         return 0;
 182 }