Examples of RWLock

com.lightcrafts.media.jai.util.RWLock
A class that provides a classic reader/writer lock functionality. This implementation is based on the JavaWorld article by Tark Modi titled "Lock on to an alternate synchronized mechanism" with some minor modifications.
This lock provides the following functionality :
- Allows multiple threads read access while only a single thread can have a write access.
- Allows a thread owning a read lock to "upgrade" to a write lock.
- Allows a thread owning a write lock to "downgrade" to a read lock.
- Allows the option to either block or specify a waitTime on certain requests.
com.pcmsolutions.util.RWLock
@author pmeehan
com.sun.media.jai.util.RWLock
A class that provides a classic reader/writer lock functionality. This implementation is based on the JavaWorld article by Tark Modi titled "Lock on to an alternate synchronized mechanism" with some minor modifications.
This lock provides the following functionality :
- Allows multiple threads read access while only a single thread can have a write access.
- Allows a thread owning a read lock to "upgrade" to a write lock.
- Allows a thread owning a write lock to "downgrade" to a read lock.
- Allows the option to either block or specify a waitTime on certain requests.
marauroa.server.RWLock
This class is a Reader/Writters lock A Reader Writer Lock is a synchronization mechanism allowing access to data.
It allows multiple threads to read the data simultaneously, but only one thread at a time to update it.
Controlling concurrent access to a shared, mutable resource is a classic problem. Clients request, and later release, either read-only or read-write access to the resource. To preserve consistency but minimize waiting, one usually wishes to allow either any number of readers or a single writer, but not both, to have access at any one time.
While a thread is updating, no other thread can read the data. The name is misleading. It may cause you to think there are two locks; in reality there is a single lock that restricts both reading and writing.
one.nio.lock.RWLock
org.jacorb.trading.util.RWLock
RWLock is a read-write lock; it allows multiple readers or a single writer; priority is given to writers
sil.spatialindex.RWLock

Examples of com.pcmsolutions.util.RWLock


    public void lockSampleRead(SampleContext sc, Integer sample) throws NoSuchSampleException, NoSuchContextException {
        if (sc == null)
            throw new NoSuchContextException();


        RWLock pLock = (RWLock) s2sl.get(sample);


        if (pLock != null)
            pLock.read();
        else
            throw new NoSuchSampleException(sample);
    }

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Examples of com.pcmsolutions.util.RWLock


    public boolean tryLockSampleRead(SampleContext sc, Integer sample) throws NoSuchSampleException, NoSuchContextException {
        if (sc == null)
            throw new NoSuchContextException();


        RWLock pLock = (RWLock) s2sl.get(sample);
        if (pLock != null) {
            return pLock.tryRead();
        } else
            throw new NoSuchSampleException(sample);
    }

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Examples of com.pcmsolutions.util.RWLock

            throw new NoSuchContextException();


        if (s2sc.get(sample) != sc)
            lockSampleWrite(getParent(sc), sample);
        else {
            RWLock pLock = (RWLock) s2sl.get(sample);
            if (pLock != null)
                pLock.write();
            else
                throw new NoSuchSampleException(sample);
        }
    }

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Examples of com.pcmsolutions.util.RWLock

            throw new NoSuchContextException();


        if (s2sc.get(sample) != sc)
            return tryLockSampleWrite(getParent(sc), sample);
        else {
            RWLock pLock = (RWLock) s2sl.get(sample);
            if (pLock != null) {
                return pLock.tryWrite();
            } else
                throw new NoSuchSampleException(sample);
        }
    }

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Examples of com.pcmsolutions.util.RWLock


    public boolean isSampleWriteLocked(SampleContext sc, Integer sample) throws NoSuchSampleException, NoSuchContextException {
        if (s2sc.get(sample) != sc || sc == null)
            throw new NoSuchContextException();


        RWLock pLock = (RWLock) s2sl.get(sample);
        if (pLock == null)
            throw new NoSuchSampleException(sample);
        return pLock.isWriteLocked();
    }

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Examples of com.sun.media.jai.util.RWLock


    public ThreadSafeOperationRegistry() {
  super();


  // Create an upgradable reader/writer lock.
  lock = new RWLock(true);
    }

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Examples of com.sun.media.jai.util.RWLock

/*     */ {
/*     */   private RWLock lock;
/*     */ 
/*     */   public ThreadSafeOperationRegistry()
/*     */   {
/*  49 */     this.lock = new RWLock(true);
/*     */   }

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Examples of marauroa.server.RWLock

  protected PlayerEntryContainer() {
    /* Initialize the random number generator */
    rand = new Random();
    rand.setSeed(new Date().getTime());


    lock = new RWLock();


    /* We initialize the list that will help us sort the player entries. */
    clientidMap = Collections.synchronizedMap(new HashMap<Integer, PlayerEntry>());
  }

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Examples of one.nio.lock.RWLock


    public boolean putIfAbsent(K key, V value) {
        long hashCode = hashCode(key);
        long currentPtr = bucketFor(hashCode);


        RWLock lock = lockFor(hashCode).lockWrite();
        try {
            for (long entry; (entry = unsafe.getAddress(currentPtr)) != 0; currentPtr = entry + NEXT_OFFSET) {
                if (unsafe.getLong(entry + HASH_OFFSET) == hashCode && equalsAt(entry, key)) {
                    return false;
                }
            }


            long entry = allocateEntry(key, hashCode, sizeOf(value));
            unsafe.putLong(entry + HASH_OFFSET, hashCode);
            unsafe.putAddress(entry + NEXT_OFFSET, 0);
            setTimeAt(entry);
            setValueAt(entry, value);


            unsafe.putAddress(currentPtr, entry);
        } finally {
            lock.unlockWrite();
        }


        count.incrementAndGet();
        return true;
    }

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Examples of one.nio.lock.RWLock

    public boolean remove(K key) {
        long hashCode = hashCode(key);
        long currentPtr = bucketFor(hashCode);
        long entry;


        RWLock lock = lockFor(hashCode).lockWrite();
        try {
            for (;;) {
                if ((entry = unsafe.getAddress(currentPtr)) == 0) {
                    return false;
                }
                if (unsafe.getLong(entry + HASH_OFFSET) == hashCode && equalsAt(entry, key)) {
                    unsafe.putAddress(currentPtr, unsafe.getAddress(entry + NEXT_OFFSET));
                    break;
                }
                currentPtr = entry + NEXT_OFFSET;
            }
        } finally {
            lock.unlockWrite();
        }


        destroyEntry(entry);
        count.decrementAndGet();
        return true;

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