/*

 * Copyright (c) 2016, 2019, Red Hat, Inc. All rights reserved.

 *

 * 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_SHENANDOAH_SHENANDOAHTASKQUEUE_INLINE_HPP

#define SHARE_GC_SHENANDOAH_SHENANDOAHTASKQUEUE_INLINE_HPP

#include "gc/shared/taskqueue.inline.hpp"

#include "gc/shenandoah/shenandoahTaskqueue.hpp"

#include "utilities/stack.inline.hpp"

template <class E, MEMFLAGS F, unsigned int N>

bool BufferedOverflowTaskQueue<E, F, N>::pop(E &t) {

  if (!_buf_empty) {

    t = _elem;

    _buf_empty = true;

    return true;

  }

  if (taskqueue_t::pop_local(t)) {

    return true;

  }

  return taskqueue_t::pop_overflow(t);

}

template <class E, MEMFLAGS F, unsigned int N>

inline bool BufferedOverflowTaskQueue<E, F, N>::push(E t) {

  if (_buf_empty) {

    _elem = t;

    _buf_empty = false;

  } else {

    bool pushed = taskqueue_t::push(_elem);

    assert(pushed, "overflow queue should always succeed pushing");

    _elem = t;

  }

  return true;

}

template <class E, MEMFLAGS F, unsigned int N>

void BufferedOverflowTaskQueue<E, F, N>::clear() {

    _buf_empty = true;

    taskqueue_t::set_empty();

    taskqueue_t::overflow_stack()->clear();

}

#endif // SHARE_GC_SHENANDOAH_SHENANDOAHTASKQUEUE_INLINE_HPP