86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
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/*
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* Copyright 2001-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// The Concurrent ZF Thread. Performs concurrent zero-filling.
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class ConcurrentZFThread: public ConcurrentGCThread {
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friend class VMStructs;
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friend class ZeroFillRegionClosure;
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private:
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// Zero fill the heap region.
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void processHeapRegion(HeapRegion* r);
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// Stats
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// Allocation (protected by heap lock).
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static int _region_allocs; // Number of regions allocated
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static int _sync_zfs; // Synchronous zero-fills +
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static int _zf_waits; // Wait for conc zero-fill completion.
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// Number of regions CFZ thread fills.
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static int _regions_filled;
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COTracker _co_tracker;
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double _vtime_start; // Initial virtual time.
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// These are static because the "print_summary_info" method is, and
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// it currently assumes there is only one ZF thread. We'll change when
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// we need to.
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static double _vtime_accum; // Initial virtual time.
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static double vtime_accum() { return _vtime_accum; }
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// Offer yield for GC. Returns true if yield occurred.
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bool offer_yield();
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public:
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// Constructor
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ConcurrentZFThread();
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// Main loop.
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virtual void run();
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// Printing
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void print();
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// Waits until "r" has been zero-filled. Requires caller to hold the
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// ZF_mon.
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static void wait_for_ZF_completed(HeapRegion* r);
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// Get or clear the current unclean region. Should be done
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// while holding the ZF_needed_mon lock.
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// shutdown
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static void stop();
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// Stats
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static void note_region_alloc() {_region_allocs++; }
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static void note_sync_zfs() { _sync_zfs++; }
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static void note_zf_wait() { _zf_waits++; }
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static void note_region_filled() { _regions_filled++; }
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static void print_summary_info();
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};
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