* @return {@code true} if successful. False return indicates that the actual value was not
   *     bitwise equal to the expected value.
   */
  public final boolean compareAndSet(double expect, double update) {
    return updater.compareAndSet(this, doubleToRawLongBits(expect), doubleToRawLongBits(update));
  }

  /**
   * Atomically sets the value to the given updated value if the current value is <a

      for (double x : VALUES) {
        assertBitEquals(prev, aa.get(i));
        assertFalse(aa.compareAndSet(i, unused, x));
        assertBitEquals(prev, aa.get(i));
        assertTrue(aa.compareAndSet(i, prev, x));
        assertBitEquals(x, aa.get(i));
        prev = x;
      }
    }
  }

  /** compareAndSet in one thread enables another waiting for value to succeed */

     * interrupt, yet it will still run, since interruptTask will leave the runner value null,
     * allowing the CAS below to succeed.
     */
    Thread currentThread = Thread.currentThread();
    if (!compareAndSet(null, currentThread)) {
      return; // someone else has run or is running.
    }

    boolean run = !isDone();
    T result = null;
    Throwable error = null;
    try {
      if (run) {

        AbstractFutureState<?> future, @Nullable Waiter expect, @Nullable Waiter update) {
      return waitersUpdater.compareAndSet(future, expect, update);
    }

    @Override
    boolean casListeners(
        AbstractFutureState<?> future, @Nullable Listener expect, Listener update) {
      return listenersUpdater.compareAndSet(future, expect, update);
    }

    @Override

   * @param update the new value
   * @return true if successful. False return indicates that the actual value was not equal to the
   *     expected value.
   */
  public final boolean compareAndSet(int i, double expect, double update) {
    return longs.compareAndSet(i, doubleToRawLongBits(expect), doubleToRawLongBits(update));
  }

  /**
   * Atomically sets the element at position {@code i} to the given updated value if the current

        AbstractFutureState<?> future, @Nullable Waiter expect, @Nullable Waiter update) {
      return waitersUpdater.compareAndSet(future, expect, update);
    }

    @Override
    boolean casListeners(
        AbstractFutureState<?> future, @Nullable Listener expect, Listener update) {
      return listenersUpdater.compareAndSet(future, expect, update);
    }

    @Override

       * other callers have added to it.
       *
       * This read is guaranteed to get us the right value because we only set this once (here).
       *
       * requireNonNull is safe because either our compareAndSet succeeded or it failed because
       * another thread did it for us.
       */
      seenExceptionsLocal = requireNonNull(seenExceptionsField);
    }
    return seenExceptionsLocal;
  }

    for (int i = 0; i < 10; i++) {
      int expectedCount = i;
      list.add(
          new Runnable() {
            @Override
            public void run() {
              integer.compareAndSet(expectedCount, expectedCount + 1);
            }
          },
          directExecutor());
    }
    list.execute();
    assertEquals(10, integer.get());
  }

      long newValue;
      do {
        oldValue = data.get(longIndex);
        newValue = oldValue | mask;
        if (oldValue == newValue) {
          return false;
        }
      } while (!data.compareAndSet(longIndex, oldValue, newValue));

      // We turned the bit on, so increment bitCount.
      bitCount.increment();
      return true;
    }

    boolean get(long bitIndex) {

      }
    } finally {
      readCompleteLatch.countDown()
    }
  }

  abstract fun listSource(): Source

  override fun ensureLoaded() {
    if (!listRead.get() && listRead.compareAndSet(false, true)) {
      readTheListUninterruptibly()
    } else {
      try {
        readCompleteLatch.await()
      } catch (_: InterruptedException) {