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         cdsc::mutex *m = new cdsc::mutex();
  52
  53         if (!model) {
  54                 snapshot_system_init(10000, 1024, 1024, 40000);
  55                 model = new ModelChecker();
  56         }
  57
  58         ModelExecution *execution = model->get_execution();
  59         execution->getMutexMap()->put(p_mutex, m);
  60
  61         return 0;
  62 }
  63
  64 int pthread_mutex_lock(pthread_mutex_t *p_mutex) {
  65         ModelExecution *execution = model->get_execution();
  66
  67         /* to protect the case where PTHREAD_MUTEX_INITIALIZER is used
  68            instead of pthread_mutex_init, or where *p_mutex is not stored
  69            in the execution->mutex_map for some reason. */
  70         if (!execution->getMutexMap()->contains(p_mutex)) {
  71                 pthread_mutex_init(p_mutex, NULL);
  72         }
  73
  74         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
  75
  76         if (m != NULL) {
  77                 m->lock();
  78         } else {
  79                 printf("ah\n");
  80         }
  81
  82         return 0;
  83 }
  84
  85 int pthread_mutex_trylock(pthread_mutex_t *p_mutex) {
  86         ModelExecution *execution = model->get_execution();
  87         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
  88         return m->try_lock();
  89 }
  90 int pthread_mutex_unlock(pthread_mutex_t *p_mutex) {
  91         ModelExecution *execution = model->get_execution();
  92         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
  93
  94         if (m != NULL) {
  95                 m->unlock();
  96         } else {
  97                 printf("try to unlock an untracked pthread_mutex\n");
  98         }
  99
 100         return 0;
 101 }
 102
 103 int pthread_mutex_timedlock (pthread_mutex_t *__restrict p_mutex,
 104                                                                                                                  const struct timespec *__restrict abstime) {
 105 // timedlock just gives the option of giving up the lock, so return and let the scheduler decide which thread goes next
 106
 107 /*
 108         ModelExecution *execution = model->get_execution();
 109         if (!execution->mutex_map.contains(p_mutex)) {
 110                 pthread_mutex_init(p_mutex, NULL);
 111         }
 112         cdsc::mutex *m = execution->mutex_map.get(p_mutex);
 113
 114         if (m != NULL) {
 115                 m->lock();
 116         } else {
 117                 printf("something is wrong with pthread_mutex_timedlock\n");
 118         }
 119
 120         printf("pthread_mutex_timedlock is called. It is currently implemented as a normal lock operation without no timeout\n");
 121  */
 122         return 0;
 123 }
 124
 125 pthread_t pthread_self() {
 126         Thread* th = model->get_current_thread();
 127         return (pthread_t)th->get_id();
 128 }
 129
 130 int pthread_key_delete(pthread_key_t) {
 131         model_print("key_delete is called\n");
 132         return 0;
 133 }
 134
 135 int pthread_cond_init(pthread_cond_t *p_cond, const pthread_condattr_t *attr) {
 136         cdsc::condition_variable *v = new cdsc::condition_variable();
 137
 138         ModelExecution *execution = model->get_execution();
 139         execution->getCondMap()->put(p_cond, v);
 140         return 0;
 141 }
 142
 143 int pthread_cond_wait(pthread_cond_t *p_cond, pthread_mutex_t *p_mutex) {
 144         ModelExecution *execution = model->get_execution();
 145         if ( !execution->getCondMap()->contains(p_cond) )
 146                 pthread_cond_init(p_cond, NULL);
 147
 148         cdsc::condition_variable *v = execution->getCondMap()->get(p_cond);
 149         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
 150
 151         v->wait(*m);
 152         return 0;
 153 }
 154
 155 int pthread_cond_timedwait(pthread_cond_t *p_cond,
 156                                                                                                          pthread_mutex_t *p_mutex, const struct timespec *abstime) {
 157 // implement cond_timedwait as a noop and let the scheduler decide which thread goes next
 158         ModelExecution *execution = model->get_execution();
 159
 160         if ( !execution->getCondMap()->contains(p_cond) )
 161                 pthread_cond_init(p_cond, NULL);
 162         if ( !execution->getMutexMap()->contains(p_mutex) )
 163                 pthread_mutex_init(p_mutex, NULL);
 164
 165         cdsc::condition_variable *v = execution->getCondMap()->get(p_cond);
 166         cdsc::mutex *m = execution->getMutexMap()->get(p_mutex);
 167
 168         model->switch_to_master(new ModelAction(NOOP, std::memory_order_seq_cst, v));
 169 //      v->wait(*m);
 170 //      printf("timed_wait called\n");
 171         return 0;
 172 }
 173
 174 int pthread_cond_signal(pthread_cond_t *p_cond) {
 175         // notify only one blocked thread
 176         ModelExecution *execution = model->get_execution();
 177         if ( !execution->getCondMap()->contains(p_cond) )
 178                 pthread_cond_init(p_cond, NULL);
 179
 180         cdsc::condition_variable *v = execution->getCondMap()->get(p_cond);
 181
 182         v->notify_one();
 183         return 0;
 184 }