static void lock(Lock lock) ctex {
  lock.lockInterruptibly();
}

static void lock(Lock lock, S msg) {
  print("Locking: " + msg);
  lock(lock);
}

static void lock(Lock lock, S msg, long timeout) {
  print("Locking: " + msg);
  lockOrFail(lock, timeout);
}

static ReentrantLock lock() {
  ret fairLock();
}