Examples of java.util.concurrent.locks.ReentrantLock.tryLock()

Class java.util.concurrent.locks.ReentrantLock

Examples of java.util.concurrent.locks.ReentrantLock.tryLock()

java.util.concurrent.locks.ReentrantLock.tryLock()
Acquires the lock only if it is not held by another thread at the time of invocation.
Acquires the lock if it is not held by another thread and returns immediately with the value {@code true}, setting the lock hold count to one. Even when this lock has been set to use a fair ordering policy, a call to {@code tryLock()} willimmediately acquire the lock if it is available, whether or not other threads are currently waiting for the lock. This "barging" behavior can be useful in certain circumstances, even though it breaks fairness. If you want to honor the fairness setting for this lock, then use {@link #tryLock(long,TimeUnit) tryLock(0, TimeUnit.SECONDS) }which is almost equivalent (it also detects interruption).
If the current thread already holds this lock then the hold count is incremented by one and the method returns {@code true}.
If the lock is held by another thread then this method will return immediately with the value {@code false}. @return {@code true} if the lock was free and was acquired by thecurrent thread, or the lock was already held by the current thread; and {@code false} otherwise


                        try
                        {
                            try
                            {
                                lockedFromClient[0] = deploymentLock.tryLock(1000, TimeUnit.MILLISECONDS);
                            }
                            catch (InterruptedException e)
                            {
                                // Ignore
                            }

View Full Code Here

     * If lock is available, poll stale refs and remove them.
     * Called from ForkJoinPool when pools become quiescent.
     */
    static final void helpExpungeStaleExceptions() {
        final ReentrantLock lock = exceptionTableLock;
        if (lock.tryLock()) {
            try {
                expungeStaleExceptions();
            } finally {
                lock.unlock();
            }

View Full Code Here

     * If lock is available, poll stale refs and remove them.
     * Called from ForkJoinPool when pools become quiescent.
     */
    static final void helpExpungeStaleExceptions() {
        final ReentrantLock lock = exceptionTableLock;
        if (lock.tryLock()) {
            try {
                expungeStaleExceptions();
            } finally {
                lock.unlock();
            }

View Full Code Here

        /**
         * Interrupt thread if not running a task
         */
        void interruptIfIdle() {
            final ReentrantLock runLock = this.runLock;
            if (runLock.tryLock()) {
                try {
                    thread.interrupt();
                } finally {
                    runLock.unlock();
                }

View Full Code Here

    }


    @Override
    public Object acquireLockIfAvailable(Order order) {
        ReentrantLock lockObject = getSessionLock();
        boolean locked = lockObject.tryLock();
        return locked ? lockObject : null;
    }


    @Override
    public void releaseLock(Object lockObject) {

View Full Code Here

   * @return whether the monitor was entered
   */
  public boolean enter(long time, TimeUnit unit) {
    long timeoutNanos = unit.toNanos(time);
    final ReentrantLock lock = this.lock;
    if (!fair && lock.tryLock()) {
      return true;
    }
    long deadline = System.nanoTime() + timeoutNanos;
    boolean interrupted = Thread.interrupted();
    try {

View Full Code Here

    long deadline = System.nanoTime() + timeoutNanos;
    boolean interrupted = Thread.interrupted();
    try {
      while (true) {
        try {
          return lock.tryLock(timeoutNanos, TimeUnit.NANOSECONDS);
        } catch (InterruptedException interrupt) {
          interrupted = true;
          timeoutNanos = deadline - System.nanoTime();
        }
      }

View Full Code Here

    if (guard.monitor != this) {
      throw new IllegalMonitorStateException();
    }
    final ReentrantLock lock = this.lock;
    boolean reentrant = lock.isHeldByCurrentThread();
    if (fair || !lock.tryLock()) {
      long deadline = System.nanoTime() + timeoutNanos;
      if (!lock.tryLock(time, unit)) {
        return false;
      }
      timeoutNanos = deadline - System.nanoTime();

View Full Code Here

    }
    final ReentrantLock lock = this.lock;
    boolean reentrant = lock.isHeldByCurrentThread();
    if (fair || !lock.tryLock()) {
      long deadline = System.nanoTime() + timeoutNanos;
      if (!lock.tryLock(time, unit)) {
        return false;
      }
      timeoutNanos = deadline - System.nanoTime();
    }

View Full Code Here

    final ReentrantLock lock = this.lock;
    long deadline = System.nanoTime() + timeoutNanos;
    boolean signalBeforeWaiting = lock.isHeldByCurrentThread();
    boolean interrupted = Thread.interrupted();
    try {
      if (fair || !lock.tryLock()) {
        boolean locked = false;
        do {
          try {
            locked = lock.tryLock(timeoutNanos, TimeUnit.NANOSECONDS);
            if (!locked) {

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.