title: boost asio - SSL async_read and async_write from one thread
body: <p>I know that OpenSSL, boost asio SSL implementation is based on, doesn't allow concurrent SSL_read() and SSL_write() (i.e. SSL_read() and SSL_write() executed by different threads).</p>
  
  <p>Is it safe to call boost asio async_read() and async_write() on SSL socket from the same thread?</p>
  
  <p>Thanks</p>