ck referenced by <I>rwlock</I> as in the
<A HREF="pthread_rwlock_rdlock.html"><B>pthread_rwlock_rdlock</B>(3)</A>
function. However, if the lock cannot be acquired without waiting for
other threads to unlock the lock, this wait shall be terminated when
the specified timeout expires. The timeout shall expire when the
absolute time specified by <I>abs_timeout</I> passes, as measured by
the clock on which timeouts are based (that is, when the value of
that clock equals or exceeds <I>abs_timeout</I>), or if the