| /* |
| * Copyright (c) 2001, 2016, 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_GC_G1_CONCURRENTMARKTHREAD_HPP |
| #define SHARE_VM_GC_G1_CONCURRENTMARKTHREAD_HPP |
| |
| #include "gc/shared/concurrentGCThread.hpp" |
| |
| // The Concurrent Mark GC Thread triggers the parallel G1CMConcurrentMarkingTasks |
| // as well as handling various marking cleanup. |
| |
| class G1ConcurrentMark; |
| class G1CollectorPolicy; |
| |
| class ConcurrentMarkThread: public ConcurrentGCThread { |
| friend class VMStructs; |
| |
| double _vtime_start; // Initial virtual time. |
| double _vtime_accum; // Accumulated virtual time. |
| |
| double _vtime_mark_accum; |
| |
| public: |
| virtual void run(); |
| |
| private: |
| G1ConcurrentMark* _cm; |
| |
| enum State { |
| Idle, |
| Started, |
| InProgress |
| }; |
| |
| volatile State _state; |
| |
| void sleepBeforeNextCycle(); |
| void delay_to_keep_mmu(G1CollectorPolicy* g1_policy, bool remark); |
| |
| void run_service(); |
| void stop_service(); |
| |
| static SurrogateLockerThread* _slt; |
| |
| public: |
| // Constructor |
| ConcurrentMarkThread(G1ConcurrentMark* cm); |
| |
| static void makeSurrogateLockerThread(TRAPS); |
| static SurrogateLockerThread* slt() { return _slt; } |
| |
| // Total virtual time so far for this thread and concurrent marking tasks. |
| double vtime_accum(); |
| // Marking virtual time so far this thread and concurrent marking tasks. |
| double vtime_mark_accum(); |
| |
| G1ConcurrentMark* cm() { return _cm; } |
| |
| void set_idle() { assert(_state != Started, "must not be starting a new cycle"); _state = Idle; } |
| bool idle() { return _state == Idle; } |
| void set_started() { assert(_state == Idle, "cycle in progress"); _state = Started; } |
| bool started() { return _state == Started; } |
| void set_in_progress() { assert(_state == Started, "must be starting a cycle"); _state = InProgress; } |
| bool in_progress() { return _state == InProgress; } |
| |
| // Returns true from the moment a marking cycle is |
| // initiated (during the initial-mark pause when started() is set) |
| // to the moment when the cycle completes (just after the next |
| // marking bitmap has been cleared and in_progress() is |
| // cleared). While during_cycle() is true we will not start another cycle |
| // so that cycles do not overlap. We cannot use just in_progress() |
| // as the CM thread might take some time to wake up before noticing |
| // that started() is set and set in_progress(). |
| bool during_cycle() { return !idle(); } |
| |
| // shutdown |
| void stop(); |
| }; |
| |
| #endif // SHARE_VM_GC_G1_CONCURRENTMARKTHREAD_HPP |