/*

 * 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.

 */

#ifndef SHARE_GC_Z_ZSAFEDELETE_INLINE_HPP

#define SHARE_GC_Z_ZSAFEDELETE_INLINE_HPP

#include "gc/z/zArray.inline.hpp"

#include "gc/z/zSafeDelete.hpp"

#include "metaprogramming/isArray.hpp"

#include "utilities/debug.hpp"

template <typename T>

ZSafeDelete<T>::ZSafeDelete() :

    _lock(),

    _enabled(0),

    _deferred() {}

template <typename T>

bool ZSafeDelete<T>::deferred_delete(ItemT* item) {

  ZLocker<ZLock> locker(&_lock);

  if (_enabled > 0) {

    _deferred.add(item);

    return true;

  }

  return false;

}

template <typename T>

void ZSafeDelete<T>::immediate_delete(ItemT* item) {

  if (IsArray<T>::value) {

    delete [] item;

  } else {

    delete item;

  }

}

template <typename T>

void ZSafeDelete<T>::enable_deferred_delete() {

  ZLocker<ZLock> locker(&_lock);

  _enabled++;

}

template <typename T>

void ZSafeDelete<T>::disable_deferred_delete() {

  ZArray<ItemT*> deferred;

  {

    ZLocker<ZLock> locker(&_lock);

    assert(_enabled > 0, "Invalid state");

    if (--_enabled == 0) {

      deferred.transfer(&_deferred);

    }

  }

  ZArrayIterator<ItemT*> iter(&deferred);

  for (ItemT* item; iter.next(&item);) {

    immediate_delete(item);

  }

}

template <typename T>

void ZSafeDelete<T>::operator()(ItemT* item) {

  if (!deferred_delete(item)) {

    immediate_delete(item);

  }

}

#endif // SHARE_GC_Z_ZSAFEDELETE_INLINE_HPP