Imported gcc-4.4.3

[msp430-gcc.git] / libjava / java / lang / ref / ReferenceQueue.java

diff --git a/libjava/java/lang/ref/ReferenceQueue.java b/libjava/java/lang/ref/ReferenceQueue.java
deleted file mode 100644 (file)
index d876ee5..0000000
--- a/libjava/java/lang/ref/ReferenceQueue.java
+++ /dev/null
@@ -1,145 +0,0 @@
-/* java.lang.ref.ReferenceQueue
-   Copyright (C) 1999 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
- 
-GNU Classpath is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING.  If not, write to the
-Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-02111-1307 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library.  Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module.  An independent module is a module which is not derived from
-or based on this library.  If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so.  If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package java.lang.ref;
-
-/**
- * This is the queue, where references can enqueue themselve on.  Each
- * reference may be registered to a queue at initialization time and
- * will be appended to the queue, when the enqueue method is called.
- *
- * The enqueue method may be automatically called by the garbage
- * collector if it detects, that the object is only reachable through
- * the Reference objects.
- *
- * @author Jochen Hoenicke
- * @see Reference#enqueue()
- */
-public class ReferenceQueue
-{
-  /**
-   * This is a linked list of references.  If this is null, the list is
-   * empty.  Otherwise this points to the first reference on the queue.
-   * The first reference will point to the next reference via the 
-   * <code>nextOnQueue</code> field.  The last reference will point to
-   * itself (not to null, since <code>nextOnQueue</code> is used to 
-   * determine if a reference is enqueued).
-   */
-  private Reference first;
-
-  /**
-   * Creates a new empty reference queue.
-   */
-  public ReferenceQueue()
-  {
-  }
-
-  /**
-   * Checks if there is a reference on the queue, returning it
-   * immediately.  The reference will be dequeued.
-   *
-   * @return a reference on the queue, if there is one,
-   * <code>null</code> otherwise.  
-   */
-  public synchronized Reference poll()
-  { 
-    return dequeue();
-  }
-
-  /**
-   * This is called by reference to enqueue itself on this queue.  
-   * @param ref the reference that should be enqueued.
-   */
-  synchronized void enqueue(Reference ref)
-  {
-    /* last reference will point to itself */
-    ref.nextOnQueue = first == null ? ref : first;
-    first = ref;
-    /* this wakes only one remove thread. */
-    notify();
-  }
-
-  /**
-   * Remove a reference from the queue, if there is one.
-   * @return the first element of the queue, or null if there isn't any.
-   */
-  private Reference dequeue()
-  {
-    if (first == null)
-      return null;
-
-    Reference result = first;
-    first = (first == first.nextOnQueue) ? null : first.nextOnQueue;
-    result.nextOnQueue = null;
-    return result;
-  }
-
-  /**
-   * Removes a reference from the queue, blocking for <code>timeout</code>
-   * until a reference is enqueued.
-   * @param timeout the timeout period in milliseconds, <code>0</code> means
-   * wait forever.
-   * @return the reference removed from the queue, or 
-   * <code>null</code> if timeout period expired.  
-   * @exception InterruptedException if the wait was interrupted.
-   */
-  public synchronized Reference remove(long timeout)
-    throws InterruptedException
-  {
-    if (first == null)
-      {
-       wait(timeout);
-      }
-
-    return dequeue();
-  }
-    
-
-  /**
-   * Removes a reference from the queue, blocking until a reference is
-   * enqueued.
-   *
-   * @return the reference removed from the queue.  
-   * @exception InterruptedException if the wait was interrupted.
-   */
-  public Reference remove()
-    throws InterruptedException
-  {
-    return remove(0L);
-  }
-}