#include <pthread.h>
#include <stdio.h>

int myglobal;
pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t mutex2 = PTHREAD_MUTEX_INITIALIZER;

void *t_fun(void *arg) {
  return NULL;
}

void *t_fun2(void *arg) {
  pthread_mutex_lock(&mutex1);
  myglobal=myglobal+1; // RACE!
  pthread_mutex_unlock(&mutex1);
  return NULL;
}

int main(void) {
  pthread_t id, id2;
  pthread_create(&id, NULL, t_fun, NULL); // enter multithreaded
  myglobal = 5; // NORACE

  pthread_create(&id2, NULL, t_fun2, NULL);
  pthread_mutex_lock(&mutex2);
  myglobal=myglobal+1; // RACE!
  pthread_mutex_unlock(&mutex2);
  return 0;
}

Add race test where all accesses don't race
Add race test where all accesses don't race
