session.acquire();
        }

        // When - Multiple threads try to release/acquire concurrently
        for (int t = 0; t < threadCount; t++) {
            final boolean shouldRelease = (t < 3); // First 3 threads release, others acquire

            executor.submit(() -> {
                try {
                    startLatch.await();

                    if (shouldRelease) {

  private fun launchTcpConnect(): ConnectResult? {
    val plan =
      when {
        routePlanner.hasNext() -> {
          try {
            routePlanner.plan()
          } catch (e: Throwable) {
            FailedPlan(e)
          }
        }
        else -> return null // Nothing further to try.
      }

    // Already connected. Return it immediately.
    if (plan.isReady) return ConnectResult(plan)

    expectMissing(e0());
  }

  @CollectionFeature.Require(absent = SUPPORTS_REMOVE)
  public void testRemoveAll_unsupportedEmptyCollection() {
    try {
      assertFalse(
          "removeAll(emptyCollection) should return false or throw "
              + "UnsupportedOperationException",
          collection.removeAll(MinimalCollection.of()));

            Runtime.getRuntime().addShutdownHook(shutdownCallback);

            commandThread = new Thread(() -> {
                try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in))) {
                    String command;
                    while (true) {
                        try {
                            while (!reader.ready()) {
                                ThreadUtil.sleep(1000L);

        /*
         * Note the Transport thread isn't running yet so we can
         * read from the socket here.
         */
        try {
            this.socket.setSoTimeout(this.transportContext.getConfig().getConnTimeout());
            if (peekKey() == null) { /* try to read header */
                throw new IOException("transport closed in negotiate");
            }
        } finally {

                        sp = '&';
                    }
                }
                url = url + urlBuf.toString();
            }

            HttpURLConnection connection = null;
            try {
                logger.fine(() -> ">>> " + method + " " + url);
                final URL u = new URL(url);
                connection = open(u);
                connection.setRequestMethod(method.toString());

        this.openFlags = openFlags;
        this.access = access;
        this.sharing = sharing;

        try (SmbTreeHandleInternal th = file.ensureTreeConnected()) {
            this.smb2 = th.isSMB2();
            if (file.getType() != SmbConstants.TYPE_NAMED_PIPE) {
                try (SmbFileHandle h = ensureOpen()) {}
                this.openFlags &= ~(SmbConstants.O_CREAT | SmbConstants.O_TRUNC);
            }

   * operation, it will be re-interrupted after the list is read.
   */
  private fun readTheListUninterruptibly() {
    var interrupted = false
    try {
      while (true) {
        try {
          readTheList()
          return
        } catch (_: InterruptedIOException) {
          Thread.interrupted() // Temporarily clear the interrupted state.
          interrupted = true

  private static void joinUninterruptibly(Thread thread, long timeout, TimeUnit unit) {
    boolean interrupted = false;
    try {
      long remainingNanos = unit.toNanos(timeout);
      long end = System.nanoTime() + remainingNanos;

      while (true) {
        try {
          // TimeUnit.timedJoin() treats negative timeouts just like zero.
          NANOSECONDS.timedJoin(thread, remainingNanos);

    try {
      getMap().replace(k0(), v3(), v4());
    } catch (UnsupportedOperationException tolerated) {
      // the operation would be a no-op, so exceptions are allowed but not required
    }
    expectUnchanged();
  }

  @MapFeature.Require(absent = SUPPORTS_PUT)
  public void testReplaceEntry_unsupportedAbsentKey() {
    try {
      getMap().replace(k3(), v3(), v4());