static void lock(Lock lock) ctex {
  ping();
  if (lock == null) ret;
  try {
    lock.lockInterruptibly();
  } catch (InterruptedException e) {
    O reason = vm_threadInterruptionReasonsMap().get(currentThread());
    print("Locking interrupted! Reason: " + strOr(reason, "Unknown");
    printStackTrace(e);
    rethrow(e);
  }
  // NO call to ping here! Make sure lock is always released.
}

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();
}