63060d898eb2af5c8db5c995dd24a7c5f1e63710
[c11tester.git] / 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
193         cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
194         cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
195
196         v->wait(*m);
197         return 0;
198 }
199
200 int pthread_cond_timedwait(pthread_cond_t *p_cond,
201                                                                                                          pthread_mutex_t *p_mutex, const struct timespec *abstime) {
202 // implement cond_timedwait as a noop and let the scheduler decide which thread goes next
203         ModelExecution *execution = model->get_execution();
204
205         if ( !execution->getCondMap()->contains(p_cond) )
206                 pthread_cond_init(p_cond, NULL);
207         if ( !execution->getMutexMap()->contains(p_mutex) )
208                 pthread_mutex_init(p_mutex, NULL);
209
210         cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
211 //      cdsc::snapmutex *m = execution->getMutexMap()->get(p_mutex);
212
213         model->switch_to_master(new ModelAction(NOOP, std::memory_order_seq_cst, v));
214 //      v->wait(*m);
215 //      printf("timed_wait called\n");
216         return 0;
217 }
218
219 int pthread_cond_signal(pthread_cond_t *p_cond) {
220         // notify only one blocked thread
221         ModelExecution *execution = model->get_execution();
222         if ( !execution->getCondMap()->contains(p_cond) )
223                 pthread_cond_init(p_cond, NULL);
224
225         cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
226
227         v->notify_one();
228         return 0;
229 }
230
231 int pthread_cond_broadcast(pthread_cond_t *p_cond) {
232         // notify all blocked threads
233         ModelExecution *execution = model->get_execution();
234         if ( !execution->getCondMap()->contains(p_cond) )
235                 pthread_cond_init(p_cond, NULL);
236
237         cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
238
239         v->notify_all();
240         return 0;
241 }
242
243 int pthread_cond_destroy(pthread_cond_t *p_cond) {
244         ModelExecution *execution = model->get_execution();
245
246         if (execution->getCondMap()->contains(p_cond)) {
247                 cdsc::snapcondition_variable *v = execution->getCondMap()->get(p_cond);
248                 delete v;
249                 execution->getCondMap()->remove(p_cond);
250         }
251         return 0;
252 }