shall return zero; otherwise, an
error number shall be returned to indicate the error. 
</P>
<P>The [EBUSY] and [EINVAL] error checks, if implemented, act as if
they were performed immediately at the beginning of processing for
the function and caused an error return prior to modifying the state
of the read-write lock specified by <I>rwlock</I>. 
</P>
<H2><A HREF="#toc4" NAME="sect4">Errors</A></H2>
<P>The <B>pthread_rwlock_destroy</B> function may fail if: 
</P>
<DL>
	<DT><B>EBUSY</B> 
	</DT><DD>
	The impl