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4965777: GC changes to support use of discovered field for pending references Summary: If and when the reference handler thread is able to use the discovered field to link reference objects in its pending list, so will GC. In that case, GC will scan through this field once a reference object has been placed on the pending list, but not scan that field before that stage, as the field is used by the concurrent GC thread to link discovered objects. When ReferenceHandleR thread does not use the discovered field for the purpose of linking the elements in the pending list, as would be the case in older JDKs, the JVM will fall back to the old behaviour of using the next field for that purpose. Reviewed-by: jcoomes, mchung, stefank
author ysr
date Wed, 07 Sep 2011 13:55:42 -0700
parents c18cbe5936b8
children
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/*
 * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef _MONITOR_
#define _MONITOR_

#include <windows.h>

class Monitor {
public:
  Monitor();
  ~Monitor();

  void lock();
  void unlock();
  // Default time is forever (i.e, zero). Returns true if it times-out, otherwise
  // false.
  bool wait(long timeout = 0);
  bool notify();
  bool notifyAll();

private:
  HANDLE owner();
  void setOwner(HANDLE owner);
  bool ownedBySelf();

  HANDLE _owner;
  long   _lock_count;
  HANDLE _lock_event;   // Auto-reset event for blocking in lock()
  HANDLE _wait_event;   // Manual-reset event for notifications
  long _counter;        // Current number of notifications
  long _waiters;        // Number of threads waiting for notification
  long _tickets;        // Number of waiters to be notified
};


#endif  // #defined _MONITOR_