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Java example source code file (concurrentG1Refine.cpp)

This example Java source code file (concurrentG1Refine.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

concurrentg1refine\:\:init, concurrentg1refine\:\:reinitialize_threads, concurrentg1refine\:\:reset_threshold_step, concurrentg1refine\:\:stop, concurrentg1refine\:\:threads_do, concurrentg1refinethread, flag_is_default, flag_set_default, free_c_heap_array, g1concrefinementthreads, max2, new_c_heap_array, null, parallelgcthreads

The concurrentG1Refine.cpp Java example source code

/*
 * Copyright (c) 2001, 2013, 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.
 *
 */

#include "precompiled.hpp"
#include "gc_implementation/g1/concurrentG1Refine.hpp"
#include "gc_implementation/g1/concurrentG1RefineThread.hpp"
#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
#include "gc_implementation/g1/g1HotCardCache.hpp"
#include "runtime/java.hpp"

ConcurrentG1Refine::ConcurrentG1Refine(G1CollectedHeap* g1h) :
  _threads(NULL), _n_threads(0),
  _hot_card_cache(g1h)
{
  // Ergomonically select initial concurrent refinement parameters
  if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) {
    FLAG_SET_DEFAULT(G1ConcRefinementGreenZone, MAX2<int>(ParallelGCThreads, 1));
  }
  set_green_zone(G1ConcRefinementGreenZone);

  if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) {
    FLAG_SET_DEFAULT(G1ConcRefinementYellowZone, green_zone() * 3);
  }
  set_yellow_zone(MAX2<int>(G1ConcRefinementYellowZone, green_zone()));

  if (FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) {
    FLAG_SET_DEFAULT(G1ConcRefinementRedZone, yellow_zone() * 2);
  }
  set_red_zone(MAX2<int>(G1ConcRefinementRedZone, yellow_zone()));

  _n_worker_threads = thread_num();
  // We need one extra thread to do the young gen rset size sampling.
  _n_threads = _n_worker_threads + 1;

  reset_threshold_step();

  _threads = NEW_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _n_threads, mtGC);

  int worker_id_offset = (int)DirtyCardQueueSet::num_par_ids();

  ConcurrentG1RefineThread *next = NULL;
  for (int i = _n_threads - 1; i >= 0; i--) {
    ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, worker_id_offset, i);
    assert(t != NULL, "Conc refine should have been created");
    if (t->osthread() == NULL) {
        vm_shutdown_during_initialization("Could not create ConcurrentG1RefineThread");
    }

    assert(t->cg1r() == this, "Conc refine thread should refer to this");
    _threads[i] = t;
    next = t;
  }
}

void ConcurrentG1Refine::reset_threshold_step() {
  if (FLAG_IS_DEFAULT(G1ConcRefinementThresholdStep)) {
    _thread_threshold_step = (yellow_zone() - green_zone()) / (worker_thread_num() + 1);
  } else {
    _thread_threshold_step = G1ConcRefinementThresholdStep;
  }
}

void ConcurrentG1Refine::init() {
  _hot_card_cache.initialize();
}

void ConcurrentG1Refine::stop() {
  if (_threads != NULL) {
    for (int i = 0; i < _n_threads; i++) {
      _threads[i]->stop();
    }
  }
}

void ConcurrentG1Refine::reinitialize_threads() {
  reset_threshold_step();
  if (_threads != NULL) {
    for (int i = 0; i < _n_threads; i++) {
      _threads[i]->initialize();
    }
  }
}

ConcurrentG1Refine::~ConcurrentG1Refine() {
  if (_threads != NULL) {
    for (int i = 0; i < _n_threads; i++) {
      delete _threads[i];
    }
    FREE_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _threads, mtGC);
  }
}

void ConcurrentG1Refine::threads_do(ThreadClosure *tc) {
  if (_threads != NULL) {
    for (int i = 0; i < _n_threads; i++) {
      tc->do_thread(_threads[i]);
    }
  }
}

void ConcurrentG1Refine::worker_threads_do(ThreadClosure * tc) {
  if (_threads != NULL) {
    for (int i = 0; i < worker_thread_num(); i++) {
      tc->do_thread(_threads[i]);
    }
  }
}

int ConcurrentG1Refine::thread_num() {
  int n_threads = (G1ConcRefinementThreads > 0) ? G1ConcRefinementThreads
                                                : ParallelGCThreads;
  return MAX2<int>(n_threads, 1);
}

void ConcurrentG1Refine::print_worker_threads_on(outputStream* st) const {
  for (int i = 0; i < _n_threads; ++i) {
    _threads[i]->print_on(st);
    st->cr();
  }
}

ConcurrentG1RefineThread * ConcurrentG1Refine::sampling_thread() const {
  return _threads[worker_thread_num()];
}

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