Mercurial > hg > icedtea8-forest > hotspot
view src/share/vm/gc_implementation/g1/concurrentMarkThread.hpp @ 10920:a435c913c8ce jdk8u292-b05
8129626: G1: set_in_progress() and clear_started() needs a barrier on non-TSO platforms
Summary: Also reviewed by vitalyd@gmail.com
Reviewed-by: pliden, bpittore, bdelsart
author | brutisso |
---|---|
date | Thu, 25 Jun 2015 08:15:07 +0200 |
parents | 581e70386ec9 |
children |
line wrap: on
line source
/* * Copyright (c) 2001, 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_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP #include "gc_implementation/shared/concurrentGCThread.hpp" // The Concurrent Mark GC Thread (could be several in the future). // This is copied from the Concurrent Mark Sweep GC Thread // Still under construction. class ConcurrentMark; 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: ConcurrentMark* _cm; enum State { Idle, Started, InProgress }; volatile State _state; void sleepBeforeNextCycle(); static SurrogateLockerThread* _slt; public: // Constructor ConcurrentMarkThread(ConcurrentMark* cm); static void makeSurrogateLockerThread(TRAPS); static SurrogateLockerThread* slt() { return _slt; } // Printing void print_on(outputStream* st) const; void print() const; // Total virtual time so far. double vtime_accum(); // Marking virtual time so far double vtime_mark_accum(); ConcurrentMark* 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_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP