#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <vector>
using namespace std;


struct data {
  unsigned long long count;
  unsigned long long *value;
  pthread_mutex_t *value_lock;
};


void *worker(void *args) {
  data *t = (data *)args;
  for (long long i = 0; i < t->count; i++) {
    pthread_mutex_lock(t->value_lock);
    t->value[0]++;
    pthread_mutex_unlock(t->value_lock);
  }
  return NULL;
}

int main(int argc, char **argv) {
  const int COUNT = argc > 1 ? atoi(argv[1]) : 1000000000;
  const int THREADS = argc > 2 ? atoi(argv[2]) : 1;
  vector<data> args(THREADS);
  vector<pthread_t> threads(THREADS);
  unsigned long long value = 0;
  pthread_mutex_t value_lock;
  pthread_mutex_init(&value_lock, NULL);
  for (int i = 0; i < THREADS; i++) {
    args[i].count = COUNT;
    args[i].value = &value;
    args[i].value_lock = &value_lock;
    pthread_create(&threads[i],NULL,worker,&args[0]);
  }
  for (int i = 0; i < THREADS; i++) {
    pthread_join(threads[i], NULL);
  }
  printf("value=%llu\n", value);
}