An application can determine whether the engine has completed its processing using select() or poll() on the asynchronous wait file descriptor. This file descriptor is available by calling <a href="../man3/SSL_get_all_async_fds.html">SSL_get_all_async_fds(3)</a> or <a href="../man3/SSL_get_changed_async_fds.html">SSL_get_changed_async_fds(3)</a>. The TLS/SSL I/O function should be called again later. The function <b>must</b> be called from the same thread that the original call was made from.</p>

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