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      1 #include <pthread.h>
      2 
      3 pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
      4 pthread_mutex_t mutex2 = PTHREAD_MUTEX_INITIALIZER;
      5 pthread_mutex_t mutex3 = PTHREAD_MUTEX_INITIALIZER;
      6 
      7 void *
      8 thread3 (void *input)
      9 {
     10     pthread_mutex_unlock(&mutex2); // Set break point at this line.
     11     pthread_mutex_unlock(&mutex1);
     12     return NULL;
     13 }
     14 
     15 void *
     16 thread2 (void *input)
     17 {
     18     pthread_mutex_unlock(&mutex3);
     19     pthread_mutex_lock(&mutex2);
     20     pthread_mutex_unlock(&mutex2);
     21 
     22     return NULL;
     23 }
     24 
     25 void *
     26 thread1 (void *input)
     27 {
     28     pthread_t thread_2;
     29     pthread_create (&thread_2, NULL, thread2, NULL);
     30 
     31     pthread_mutex_lock(&mutex1);
     32     pthread_mutex_unlock(&mutex1);
     33 
     34     pthread_join(thread_2, NULL);
     35 
     36     return NULL;
     37 }
     38 
     39 int main ()
     40 {
     41   pthread_t thread_1;
     42   pthread_t thread_3;
     43 
     44   pthread_mutex_lock (&mutex1);
     45   pthread_mutex_lock (&mutex2);
     46   pthread_mutex_lock (&mutex3);
     47 
     48   pthread_create (&thread_1, NULL, thread1, NULL);
     49 
     50   pthread_mutex_lock(&mutex3);
     51   pthread_create (&thread_3, NULL, thread3, NULL);
     52 
     53   pthread_join (thread_1, NULL);
     54   pthread_join (thread_3, NULL);
     55 
     56   return 0;
     57 
     58 }
     59