/*

 * Copyright (c) 2019, 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/g1/g1ParallelCleaning.hpp"

#if INCLUDE_JVMCI

#include "jvmci/jvmci.hpp"

#endif

#if INCLUDE_JVMCI

JVMCICleaningTask::JVMCICleaningTask() :

  _cleaning_claimed(0) {

}

bool JVMCICleaningTask::claim_cleaning_task() {

  if (_cleaning_claimed) {

    return false;

  }

  return Atomic::cmpxchg(&_cleaning_claimed, 0, 1) == 0;

}

void JVMCICleaningTask::work(bool unloading_occurred) {

  // One worker will clean JVMCI metadata handles.

  if (unloading_occurred && EnableJVMCI && claim_cleaning_task()) {

    JVMCI::do_unloading(unloading_occurred);

  }

}

#endif // INCLUDE_JVMCI

G1ParallelCleaningTask::G1ParallelCleaningTask(BoolObjectClosure* is_alive,

                                               uint num_workers,

                                               bool unloading_occurred,

                                               bool resize_dedup_table) :

  AbstractGangTask("G1 Parallel Cleaning"),

  _unloading_occurred(unloading_occurred),

  _string_dedup_task(is_alive, NULL, resize_dedup_table),

  _code_cache_task(num_workers, is_alive, unloading_occurred),

  JVMCI_ONLY(_jvmci_cleaning_task() COMMA)

  _klass_cleaning_task() {

}

// The parallel work done by all worker threads.

void G1ParallelCleaningTask::work(uint worker_id) {

  // Clean JVMCI metadata handles.

  // Execute this task first because it is serial task.

  JVMCI_ONLY(_jvmci_cleaning_task.work(_unloading_occurred);)

  // Do first pass of code cache cleaning.

  _code_cache_task.work(worker_id);

  // Clean the string dedup data structures.

  _string_dedup_task.work(worker_id);

  // Clean all klasses that were not unloaded.

  // The weak metadata in klass doesn't need to be

  // processed if there was no unloading.

  if (_unloading_occurred) {

    _klass_cleaning_task.work();

  }

}