Java example source code file (monitorChunk.hpp)

This example Java source code file (monitorChunk.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

basicobjectlock, cheapobj, monitorchunk, null, share_vm_runtime_monitorchunk_hpp

The monitorChunk.hpp Java example source code

/*
 * Copyright (c) 1997, 2012, 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 SHARE_VM_RUNTIME_MONITORCHUNK_HPP
#define SHARE_VM_RUNTIME_MONITORCHUNK_HPP

#include "runtime/synchronizer.hpp"

// Data structure for holding monitors for one activation during
// deoptimization.

class MonitorChunk: public CHeapObj<mtInternal> {
 private:
  int              _number_of_monitors;
  BasicObjectLock* _monitors;
  BasicObjectLock* monitors() const { return _monitors; }
  MonitorChunk*    _next;
 public:
  // Constructor
  MonitorChunk(int number_on_monitors);
  ~MonitorChunk();

  // link operations
  MonitorChunk* next() const                { return _next; }
  void set_next(MonitorChunk* next)         { _next = next; }

  // Tells whether the monitor chunk is linked into the JavaThread
  bool is_linked() const                    { return next() != NULL; }

  // Returns the number of monitors
  int number_of_monitors() const { return _number_of_monitors; }

  // Returns the index'th monitor
  BasicObjectLock* at(int index)            { assert(index >= 0 && index < number_of_monitors(), "out of bounds check"); return &monitors()[index]; }


  // Memory management
  void oops_do(OopClosure* f);

  // Tells whether the addr point into the monitors.
  bool contains(void* addr) const           { return (addr >= (void*) monitors()) && (addr <  (void*) (monitors() + number_of_monitors())); }
};

#endif // SHARE_VM_RUNTIME_MONITORCHUNK_HPP