Merge "Fix an issue in TrackRecord."

 */

interface TrackRecord<E> : List<E> {

    /**

     * Adds an element to this queue, waking up threads waiting for one. Returns the element.

     * Adds an element to this queue, waking up threads waiting for one. Returns true, as

     * per the contract for List.

     */

    fun add(e: E): TrackRecord<E>

    fun add(e: E): Boolean

    /**

     * Returns the first element after {@param pos}, possibly blocking until one is available, or

    }

    // TrackRecord<E> implementation

    override fun add(e: E): ArrayTrackRecord<E> {

    override fun add(e: E): Boolean {

        lock.withLock {

            elements.add(e)

            condition.signalAll()

        }

        return this

        return true

    }

    override fun poll(timeoutMs: Long, pos: Int, predicate: (E) -> Boolean) = lock.withLock {

        elements.getOrNull(pollForIndexReadLocked(timeoutMs, pos, predicate))