87 lines
2.7 KiB
C++
87 lines
2.7 KiB
C++
/*
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* Copyright (c) 2001, 2009, 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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// Forward Decl.
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class ConcurrentG1Refine;
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// The G1 Concurrent Refinement Thread (could be several in the future).
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class ConcurrentG1RefineThread: public ConcurrentGCThread {
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friend class VMStructs;
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friend class G1CollectedHeap;
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double _vtime_start; // Initial virtual time.
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double _vtime_accum; // Initial virtual time.
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int _worker_id;
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int _worker_id_offset;
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// The refinement threads collection is linked list. A predecessor can activate a successor
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// when the number of the rset update buffer crosses a certain threshold. A successor
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// would self-deactivate when the number of the buffers falls below the threshold.
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bool _active;
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ConcurrentG1RefineThread* _next;
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Monitor* _monitor;
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ConcurrentG1Refine* _cg1r;
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int _thread_threshold_step;
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// This thread activation threshold
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int _threshold;
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// This thread deactivation threshold
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int _deactivation_threshold;
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void sample_young_list_rs_lengths();
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void run_young_rs_sampling();
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void wait_for_completed_buffers();
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void set_active(bool x) { _active = x; }
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bool is_active();
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void activate();
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void deactivate();
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// For use by G1CollectedHeap, which is a friend.
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static SuspendibleThreadSet* sts() { return &_sts; }
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public:
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virtual void run();
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// Constructor
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ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread* next,
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int worker_id_offset, int worker_id);
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void initialize();
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// Printing
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void print() const;
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void print_on(outputStream* st) const;
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// Total virtual time so far.
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double vtime_accum() { return _vtime_accum; }
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ConcurrentG1Refine* cg1r() { return _cg1r; }
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// Yield for GC
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void yield();
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// shutdown
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void stop();
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};
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