/*

 * 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)

{

  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()];

}