object.java

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     *     synchronized static method of that class. 
     * </ul>
     * <p>
     * Only one thread at a time can own an object's monitor. 
     *
     * @exception  IllegalMonitorStateException  if the current thread is not
     *               the owner of this object's monitor.
     * @see        java.lang.Object#notifyAll()
     * @see        java.lang.Object#wait()
     */
    public final native void notify();

    /**
     * Wakes up all threads that are waiting on this object's monitor. A 
     * thread waits on an object's monitor by calling one of the 
     * <code>wait</code> methods.
     * <p>
     * The awakened threads will not be able to proceed until the current 
     * thread relinquishes the lock on this object. The awakened threads 
     * will compete in the usual manner with any other threads that might 
     * be actively competing to synchronize on this object; for example, 
     * the awakened threads enjoy no reliable privilege or disadvantage in 
     * being the next thread to lock this object.
     * <p>
     * This method should only be called by a thread that is the owner 
     * of this object's monitor. See the <code>notify</code> method for a 
     * description of the ways in which a thread can become the owner of 
     * a monitor. 
     *
     * @exception  IllegalMonitorStateException  if the current thread is not
     *               the owner of this object's monitor.
     * @see        java.lang.Object#notify()
     * @see        java.lang.Object#wait()
     */
    public final native void notifyAll();

    /**
     * Causes current thread to wait until either another thread invokes the 
     * {@link java.lang.Object#notify()} method or the 
     * {@link java.lang.Object#notifyAll()} method for this object, or a 
     * specified amount of time has elapsed. 
     * <p>
     * The current thread must own this object's monitor. 
     * <p>
     * This method causes the current thread (call it <var>T</var>) to 
     * place itself in the wait set for this object and then to relinquish 
     * any and all synchronization claims on this object. Thread <var>T</var> 
     * becomes disabled for thread scheduling purposes and lies dormant 
     * until one of four things happens:
     * <ul>
     * <li>Some other thread invokes the <tt>notify</tt> method for this 
     * object and thread <var>T</var> happens to be arbitrarily chosen as 
     * the thread to be awakened. 
     * <li>Some other thread invokes the <tt>notifyAll</tt> method for this 
     * object. 
     * <li>Some other thread {@link java.lang.Thread#interrupt() interrupts} 
     * thread <var>T</var>. 
     * <li>The specified amount of real time has elapsed, more or less.  If 
     * <tt>timeout</tt> is zero, however, then real time is not taken into 
     * consideration and the thread simply waits until notified. 
     * </ul>
     * The thread <var>T</var> is then removed from the wait set for this 
     * object and re-enabled for thread scheduling. It then competes in the 
     * usual manner with other threads for the right to synchronize on the 
     * object; once it has gained control of the object, all its 
     * synchronization claims on the object are restored to the status quo 
     * ante - that is, to the situation as of the time that the <tt>wait</tt> 
     * method was invoked. Thread <var>T</var> then returns from the 
     * invocation of the <tt>wait</tt> method. Thus, on return from the 
     * <tt>wait</tt> method, the synchronization state of the object and of 
     * thread <tt>T</tt> is exactly as it was when the <tt>wait</tt> method 
     * was invoked. 
     * <p>
     * If the current thread is 
     * {@link java.lang.Thread#interrupt() interrupted} by another thread 
     * while it is waiting, then an <tt>InterruptedException</tt> is thrown. 
     * This exception is not thrown until the lock status of this object has 
     * been restored as described above.
     * <p>
     * Note that the <tt>wait</tt> method, as it places the current thread 
     * into the wait set for this object, unlocks only this object; any 
     * other objects on which the current thread may be synchronized remain 
     * locked while the thread waits.
     * <p>
     * This method should only be called by a thread that is the owner 
     * of this object's monitor. See the <code>notify</code> method for a 
     * description of the ways in which a thread can become the owner of 
     * a monitor. 
     *
     * @param      timeout   the maximum time to wait in milliseconds.
     * @exception  IllegalArgumentException      if the value of timeout is
     *		     negative.
     * @exception  IllegalMonitorStateException  if the current thread is not
     *               the owner of the object's monitor.
     * @exception  InterruptedException if another thread has interrupted
     *             the current thread.  The <i>interrupted status</i> of the
     *             current thread is cleared when this exception is thrown.
     * @see        java.lang.Object#notify()
     * @see        java.lang.Object#notifyAll()
     */
    public final native void wait(long timeout) throws InterruptedException;

    /**
     * Causes current thread to wait until another thread invokes the 
     * {@link java.lang.Object#notify()} method or the 
     * {@link java.lang.Object#notifyAll()} method for this object, or 
     * some other thread interrupts the current thread, or a certain 
     * amount of real time has elapsed. 
     * <p>
     * This method is similar to the <code>wait</code> method of one 
     * argument, but it allows finer control over the amount of time to 
     * wait for a notification before giving up. The amount of real time, 
     * measured in nanoseconds, is given by:
     * <blockquote>
     * <pre>
     * 1000000*timeout+nanos</pre></blockquote>
     * <p>
     * In all other respects, this method does the same thing as the 
     * method {@link #wait(long)} of one argument. In particular, 
     * <tt>wait(0, 0)</tt> means the same thing as <tt>wait(0)</tt>.
     * <p>
     * The current thread must own this object's monitor. The thread 
     * releases ownership of this monitor and waits until either of the 
     * following two conditions has occurred: 
     * <ul>
     * <li>Another thread notifies threads waiting on this object's monitor 
     *     to wake up either through a call to the <code>notify</code> method 
     *     or the <code>notifyAll</code> method. 
     * <li>The timeout period, specified by <code>timeout</code> 
     *     milliseconds plus <code>nanos</code> nanoseconds arguments, has 
     *     elapsed. 
     * </ul>
     * <p>
     * The thread then waits until it can re-obtain ownership of the 
     * monitor and resumes execution.
     * <p>
     * This method should only be called by a thread that is the owner 
     * of this object's monitor. See the <code>notify</code> method for a 
     * description of the ways in which a thread can become the owner of 
     * a monitor. 
     *
     * @param      timeout   the maximum time to wait in milliseconds.
     * @param      nanos      additional time, in nanoseconds range
     *                       0-999999.
     * @exception  IllegalArgumentException      if the value of timeout is
     *			    negative or the value of nanos is
     *			    not in the range 0-999999.
     * @exception  IllegalMonitorStateException  if the current thread is not
     *               the owner of this object's monitor.
     * @exception  InterruptedException if another thread has interrupted
     *             the current thread.  The <i>interrupted status</i> of the
     *             current thread is cleared when this exception is thrown.
     */
    public final void wait(long timeout, int nanos) throws InterruptedException {
        if (timeout < 0) {
            throw new IllegalArgumentException("timeout value is negative");
        }

        if (nanos < 0 || nanos > 999999) {
            throw new IllegalArgumentException(
				"nanosecond timeout value out of range");
        }

	if (nanos >= 500000 || (nanos != 0 && timeout == 0)) {
	    timeout++;
	}

	wait(timeout);
    }

    /**
     * Causes current thread to wait until another thread invokes the 
     * {@link java.lang.Object#notify()} method or the 
     * {@link java.lang.Object#notifyAll()} method for this object. 
     * In other words, this method behaves exactly as if it simply 
     * performs the call <tt>wait(0)</tt>.
     * <p>
     * The current thread must own this object's monitor. The thread 
     * releases ownership of this monitor and waits until another thread 
     * notifies threads waiting on this object's monitor to wake up 
     * either through a call to the <code>notify</code> method or the 
     * <code>notifyAll</code> method. The thread then waits until it can 
     * re-obtain ownership of the monitor and resumes execution. 
     * <p>
     * This method should only be called by a thread that is the owner 
     * of this object's monitor. See the <code>notify</code> method for a 
     * description of the ways in which a thread can become the owner of 
     * a monitor. 
     *
     * @exception  IllegalMonitorStateException  if the current thread is not
     *               the owner of the object's monitor.
     * @exception  InterruptedException if another thread has interrupted
     *             the current thread.  The <i>interrupted status</i> of the
     *             current thread is cleared when this exception is thrown.
     * @see        java.lang.Object#notify()
     * @see        java.lang.Object#notifyAll()
     */
    public final void wait() throws InterruptedException {
	wait(0);
    }

    /**
     * Called by the garbage collector on an object when garbage collection
     * determines that there are no more references to the object.
     * A subclass overrides the <code>finalize</code> method to dispose of
     * system resources or to perform other cleanup. 
     * <p>
     * The general contract of <tt>finalize</tt> is that it is invoked 
     * if and when the Java<font size="-2"><sup>TM</sup></font> virtual 
     * machine has determined that there is no longer any
     * means by which this object can be accessed by any thread that has
     * not yet died, except as a result of an action taken by the
     * finalization of some other object or class which is ready to be
     * finalized. The <tt>finalize</tt> method may take any action, including
     * making this object available again to other threads; the usual purpose
     * of <tt>finalize</tt>, however, is to perform cleanup actions before 
     * the object is irrevocably discarded. For example, the finalize method 
     * for an object that represents an input/output connection might perform
     * explicit I/O transactions to break the connection before the object is
     * permanently discarded. 
     * <p>
     * The <tt>finalize</tt> method of class <tt>Object</tt> performs no 
     * special action; it simply returns normally. Subclasses of 
     * <tt>Object</tt> may override this definition.
     * <p>
     * The Java programming language does not guarantee which thread will 
     * invoke the <tt>finalize</tt> method for any given object. It is 
     * guaranteed, however, that the thread that invokes finalize will not 
     * be holding any user-visible synchronization locks when finalize is 
     * invoked. If an uncaught exception is thrown by the finalize method, 
     * the exception is ignored and finalization of that object terminates.
     * <p>
     * After the <tt>finalize</tt> method has been invoked for an object, no 
     * further action is taken until the Java virtual machine has again 
     * determined that there is no longer any means by which this object can 
     * be accessed by any thread that has not yet died, including possible
     * actions by other objects or classes which are ready to be finalized, 
     * at which point the object may be discarded.
     * <p>
     * The <tt>finalize</tt> method is never invoked more than once by a Java
     * virtual machine for any given object.
     * <p>
     * Any exception thrown by the <code>finalize</code> method causes 
     * the finalization of this object to be halted, but is otherwise 
     * ignored. 
     *
     * @throws Throwable the <code>Exception</code> raised by this method
     */
    protected void finalize() throws Throwable { }
}