code: func (rw *BoundedRWLock) WUnlock() {
  	rw.control.Lock()
  	rw.nextWriter = nil
  	rw.processQueue()
  	rw.control.Unlock()
  }
docs: // Unlock the write lock.
  //
  // Should be called only on a goroutine which has gotten a non-error return
  // value from WLock().