Examples of java.util.concurrent.locks.Lock.lock()

java.util.concurrent.locks.Lock.lock()
Acquires the lock.
If the lock is not available then the current thread becomes disabled for thread scheduling purposes and lies dormant until the lock has been acquired.
Implementation Considerations
A {@code Lock} implementation may be able to detect erroneous useof the lock, such as an invocation that would cause deadlock, and may throw an (unchecked) exception in such circumstances. The circumstances and the exception type must be documented by that {@code Lock} implementation.

                return true;
            } else {
                int h1 = hash1(x);
                Lock lock1 = locks[1][h1 % LOCKS];
                try {
                    lock1.lock();
                    if(x.equals(table[1][h1])) {
                        table[1][h1] = null;
                        return true;
                    }
                    return false;

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    boolean validate(TreeSet<Intent>[] intentions, List<Lock> acquired) {
        for(int phase = 0; phase < 2; phase++) {
            for(Intent intent : intentions[phase]) {
                // lock and prepare to unlock
                Lock lock = locks[phase][intent.index % LOCKS];
                lock.lock();
                acquired.add(lock);
                // beware that expected could be null
                T expected = intent.item;
                T found = table[phase][intent.index];
                if(expected == null) {

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    @Override
    public final void acquire(T x) {
        Lock lock0 = lock[0][hash0(x) % lock[0].length];
        Lock lock1 = lock[1][hash1(x) % lock[1].length];
        lock0.lock();
        lock1.lock();
    }


    /**
     * synchronize after adding, removing, or testing for item
     * @param x item involved

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                    NakAckHeader hdr=(NakAckHeader)((Message)evt.getArg()).getHeader(NAKACK_ID);
                    if(hdr != null)
                        delivered_msg_list.add(hdr.getSeqno());


                    if(delivered_msgs.get() >= num_msgs) {
                        lock.lock();
                        try {
                            all_msgs_delivered.signalAll();
                        }
                        finally {
                            lock.unlock();

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        }


        long start=System.currentTimeMillis();
        latch.countDown(); // starts all adders


        lock.lock();
        try {
            while(delivered_msgs.get() < num_msgs) {
                try {
                    all_msgs_delivered.await(1000, TimeUnit.MILLISECONDS);
                    System.out.println("received " + delivered_msgs.get() + " msgs");

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    for (int index = 0; index < length; index++) {
      DirectoryProvider directoryProvider = directoryProviders[index];
      IndexReader reader;
      Lock directoryProviderLock = perDirectoryProviderManipulationLocks.get( directoryProvider );
      if ( trace ) log.trace( "Opening IndexReader from " + directoryProvider.getDirectory().toString() );
      directoryProviderLock.lock(); //needed for same problem as the double-checked locking
      try {
        reader = activeSearchIndexReaders.get( directoryProvider );
      }
      finally {
        directoryProviderLock.unlock();

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          reader = replaceActiveReader( outOfDateReader, directoryProviderLock, directoryProvider, readers );
        }
        else {
          if ( trace )
            log.trace( "Valid shared IndexReader: " + directoryProvider.getDirectory().toString() );
          directoryProviderLock.lock();
          try {
            //read the latest active one, the current one could be out of date and closed already
            //the latest active is guaranteed to be active because it's protected by the dp lock
            reader = activeSearchIndexReaders.get( directoryProvider );
            semaphoreIndexReaderLock.lock();

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      }


      //acquire the locks in the same order as everywhere else
      Lock directoryProviderLock = perDirectoryProviderManipulationLocks.get( readerData.provider );
      boolean closeReader = false;
      directoryProviderLock.lock();
      try {
        boolean isActive;
        isActive = activeSearchIndexReaders.get( readerData.provider ) == subReader;
        if ( trace ) log.trace( "Indexreader not active: " + subReader );
        semaphoreIndexReaderLock.lock();

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    }


    public static class NoCleanUpRemoteProcess implements Action<WorkerProcessContext>, Serializable {
        public void execute(WorkerProcessContext workerProcessContext) {
            final Lock lock = new ReentrantLock();
            lock.lock();
            new Thread(new Runnable() {
                public void run() {
                    lock.lock();
                }
            }).start();

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        public void execute(WorkerProcessContext workerProcessContext) {
            final Lock lock = new ReentrantLock();
            lock.lock();
            new Thread(new Runnable() {
                public void run() {
                    lock.lock();
                }
            }).start();


            TestListenerInterface sender = workerProcessContext.getServerConnection().addOutgoing(
                    TestListenerInterface.class);

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