title: Null arguments to pthread_cond_wait
body: <p>If a thread calls pthread_cond_wait(cond_ptr,mutex_ptr) will a <em>null</em> cond_ptr, is it guaranteed to not fall asleep?</p>
  
  <p>According to <a href="http://pubs.opengroup.org/onlinepubs/007908799/xsh/pthread_cond_wait.html" rel="nofollow">http://pubs.opengroup.org/onlinepubs/007908799/xsh/pthread_cond_wait.html</a>,
  a null cond_ptr just means pthread_cond_wait()  <em>may</em> (not an emphatic <strong>will</strong>) fail, so I guess threads can then fall asleep on null condition variables?</p>