1/*
2 * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
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24
25#ifndef SHARE_VM_GC_G1_CONCURRENTG1REFINETHREAD_HPP
26#define SHARE_VM_GC_G1_CONCURRENTG1REFINETHREAD_HPP
27
28#include "gc/shared/concurrentGCThread.hpp"
29
30// Forward Decl.
31class CardTableEntryClosure;
32class ConcurrentG1Refine;
33
34// One or more G1 Concurrent Refinement Threads may be active if concurrent
35// refinement is in progress.
36class ConcurrentG1RefineThread: public ConcurrentGCThread {
37  friend class VMStructs;
38  friend class G1CollectedHeap;
39
40  double _vtime_start;  // Initial virtual time.
41  double _vtime_accum;  // Accumulated virtual time.
42  uint _worker_id;
43  uint _worker_id_offset;
44
45  // The refinement threads collection is linked list. A predecessor can activate a successor
46  // when the number of the rset update buffer crosses a certain threshold. A successor
47  // would self-deactivate when the number of the buffers falls below the threshold.
48  bool _active;
49  ConcurrentG1RefineThread* _next;
50  Monitor* _monitor;
51  ConcurrentG1Refine* _cg1r;
52
53  // The closure applied to completed log buffers.
54  CardTableEntryClosure* _refine_closure;
55
56  // This thread's activation/deactivation thresholds
57  size_t _activation_threshold;
58  size_t _deactivation_threshold;
59
60  void wait_for_completed_buffers();
61
62  void set_active(bool x) { _active = x; }
63  bool is_active();
64  void activate();
65  void deactivate();
66
67  bool is_primary() { return (_worker_id == 0); }
68
69  void run_service();
70  void stop_service();
71
72public:
73  // Constructor
74  ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread* next,
75                           CardTableEntryClosure* refine_closure,
76                           uint worker_id_offset, uint worker_id,
77                           size_t activate, size_t deactivate);
78
79  void update_thresholds(size_t activate, size_t deactivate);
80  size_t activation_threshold() const { return _activation_threshold; }
81
82  // Total virtual time so far.
83  double vtime_accum() { return _vtime_accum; }
84
85  ConcurrentG1Refine* cg1r() { return _cg1r;     }
86};
87
88#endif // SHARE_VM_GC_G1_CONCURRENTG1REFINETHREAD_HPP
89