title: On Mac OS programming, what is default? nonatomic or atomic?
body: <pre><code>@property ( atomic, assign ) Object *object1;
  @property ( nonatomic, assign ) Object *object2;
  </code></pre>
  
  <p>What is default setting?
  I know that 'nonatomic' is default setting on iPhone programming.</p>
  
  <p>On the Mac programming? Is that the same?</p>
  
  <p>Thank you for reading this question.</p>