Function pthread_rwlock_timedrdlock 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pthread_rwlock_timedrdlock(
    rwlock: *mut pthread_rwlock_t,
    abstime: *const timespec,
) -> c_int

See https://pubs.opengroup.org/onlinepubs/9799919799/functions/pthread_rwlock_timedrdlock.html.