hotspot/src/share/vm/gc_implementation/g1/satbQueue.hpp
author stefank
Mon, 07 Jul 2014 10:12:40 +0200
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8049421: G1 Class Unloading after completing a concurrent mark cycle Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
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/*
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 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
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#include "gc_implementation/g1/ptrQueue.hpp"
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class ObjectClosure;
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class JavaThread;
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class SATBMarkQueueSet;
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// A ptrQueue whose elements are "oops", pointers to object heads.
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class ObjPtrQueue: public PtrQueue {
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  friend class Threads;
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  friend class SATBMarkQueueSet;
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  friend class G1RemarkThreadsClosure;
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private:
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  // Filter out unwanted entries from the buffer.
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  void filter();
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  // Apply the closure to all elements.
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  void apply_closure(ObjectClosure* cl);
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  // Apply the closure to all elements and empty the buffer;
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  void apply_closure_and_empty(ObjectClosure* cl);
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  // Apply the closure to all elements of "buf", down to "index" (inclusive.)
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  static void apply_closure_to_buffer(ObjectClosure* cl,
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                                      void** buf, size_t index, size_t sz);
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public:
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  ObjPtrQueue(PtrQueueSet* qset, bool perm = false) :
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    // SATB queues are only active during marking cycles. We create
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    // them with their active field set to false. If a thread is
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    // created during a cycle and its SATB queue needs to be activated
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    // before the thread starts running, we'll need to set its active
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    // field to true. This is done in JavaThread::initialize_queues().
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    PtrQueue(qset, perm, false /* active */) { }
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  // Overrides PtrQueue::flush() so that it can filter the buffer
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  // before it is flushed.
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  virtual void flush();
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  // Overrides PtrQueue::should_enqueue_buffer(). See the method's
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  // definition for more information.
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  virtual bool should_enqueue_buffer();
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#ifndef PRODUCT
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  // Helpful for debugging
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  void print(const char* name);
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  static void print(const char* name, void** buf, size_t index, size_t sz);
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#endif // PRODUCT
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  void verify_oops_in_buffer() NOT_DEBUG_RETURN;
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};
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class SATBMarkQueueSet: public PtrQueueSet {
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  ObjectClosure* _closure;
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  ObjectClosure** _par_closures;  // One per ParGCThread.
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  ObjPtrQueue _shared_satb_queue;
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  // Utility function to support sequential and parallel versions.  If
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  // "par" is true, then "worker" is the par thread id; if "false", worker
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  // is ignored.
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  bool apply_closure_to_completed_buffer_work(bool par, uint worker);
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#ifdef ASSERT
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  void dump_active_states(bool expected_active);
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  void verify_active_states(bool expected_active);
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#endif // ASSERT
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public:
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  SATBMarkQueueSet();
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  void initialize(Monitor* cbl_mon, Mutex* fl_lock,
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                  int process_completed_threshold,
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                  Mutex* lock);
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  static void handle_zero_index_for_thread(JavaThread* t);
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  // Apply "set_active(active)" to all SATB queues in the set. It should be
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  // called only with the world stopped. The method will assert that the
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  // SATB queues of all threads it visits, as well as the SATB queue
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  // set itself, has an active value same as expected_active.
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  void set_active_all_threads(bool active, bool expected_active);
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  // Filter all the currently-active SATB buffers.
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  void filter_thread_buffers();
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  // Register "blk" as "the closure" for all queues.  Only one such closure
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  // is allowed.  The "apply_closure_to_completed_buffer" method will apply
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  // this closure to a completed buffer, and "iterate_closure_all_threads"
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  // applies it to partially-filled buffers (the latter should only be done
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  // with the world stopped).
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  void set_closure(ObjectClosure* closure);
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  // Set the parallel closures: pointer is an array of pointers to
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  // closures, one for each parallel GC thread.
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  void set_par_closure(int i, ObjectClosure* closure);
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  // If there exists some completed buffer, pop it, then apply the
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  // registered closure to all its elements, and return true.  If no
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  // completed buffers exist, return false.
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  bool apply_closure_to_completed_buffer() {
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    return apply_closure_to_completed_buffer_work(false, 0);
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  }
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  // Parallel version of the above.
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  bool par_apply_closure_to_completed_buffer(uint worker) {
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    return apply_closure_to_completed_buffer_work(true, worker);
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  }
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  // Apply the given closure on enqueued and currently-active buffers
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  // respectively. Both methods are read-only, i.e., they do not
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  // modify any of the buffers.
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  void iterate_completed_buffers_read_only(ObjectClosure* cl);
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  void iterate_thread_buffers_read_only(ObjectClosure* cl);
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#ifndef PRODUCT
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  // Helpful for debugging
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  void print_all(const char* msg);
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#endif // PRODUCT
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  ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; }
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  // If a marking is being abandoned, reset any unprocessed log buffers.
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  void abandon_partial_marking();
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};
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP