/*
 * Copyright (c) 2021, 2026, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2021, 2022, Huawei Technologies Co., Ltd. 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
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 */

#ifndef SHARE_GC_G1_G1MONOTONICARENA_INLINE_HPP
#define SHARE_GC_G1_G1MONOTONICARENA_INLINE_HPP

#include "gc/g1/g1MonotonicArena.hpp"

#include "utilities/globalCounter.inline.hpp"

inline void* G1MonotonicArena::Segment::allocate_slot() {
  if (_next_allocate.load_relaxed() >= _num_slots) {
    return nullptr;
  }
  uint result = _next_allocate.fetch_then_add(1u, memory_order_relaxed);
  if (result >= _num_slots) {
    return nullptr;
  }
  void* r = payload(static_cast<size_t>(result) * _slot_size);
  return r;
}

inline G1MonotonicArena::Segment* G1MonotonicArena::SegmentFreeList::get() {
  GlobalCounter::CriticalSection cs(Thread::current());

  Segment* result = _list.pop();
  if (result != nullptr) {
    _num_segments.sub_then_fetch(1u, memory_order_relaxed);
    _mem_size.sub_then_fetch(result->mem_size(), memory_order_relaxed);
  }
  return result;
}

#endif //SHARE_GC_G1_G1MONOTONICARENA_INLINE_HPP