ALooper::awaitResponse gets reply and returns immediately if the looper is stopped.

// to be called by AMessage::postAndAwaitResponse only

status_t ALooper::awaitResponse(const sp<AReplyToken> &replyToken, sp<AMessage> *response) {

    {

        Mutex::Autolock autoLock(mLock);

        if (mThread == NULL) {

            return -ENOENT;

        }

    }

    // return status in case we want to handle an interrupted wait

    Mutex::Autolock autoLock(mRepliesLock);

    CHECK(replyToken != NULL);

    bool gotReply;

    bool shouldContinue = true;

    while (!(gotReply = replyToken->retrieveReply(response)) && shouldContinue) {

        mRepliesCondition.wait(mRepliesLock);

    while (!replyToken->retrieveReply(response)) {

        {

            Mutex::Autolock autoLock(mLock);

            if (mThread == NULL) {

                shouldContinue = false;

                // continue and try to get potential reply one more time before break the loop

                return -ENOENT;

            }

        }

        mRepliesCondition.wait(mRepliesLock);

    }

    return gotReply ? OK : -ENOENT;

    return OK;

}

status_t ALooper::postReply(const sp<AReplyToken> &replyToken, const sp<AMessage> &reply) {