author | kbarrett |
Fri, 19 Jul 2019 16:47:11 -0400 | |
changeset 55752 | 8ae33203d600 |
child 57507 | f6b30bd6804e |
permissions | -rw-r--r-- |
55752
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/* |
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* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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|
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#include "precompiled.hpp" |
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#include "gc/g1/g1RedirtyCardsQueue.hpp" |
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#include "runtime/atomic.hpp" |
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#include "utilities/debug.hpp" |
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#include "utilities/macros.hpp" |
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|
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// G1RedirtyCardsBufferList |
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|
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G1RedirtyCardsBufferList::G1RedirtyCardsBufferList() : |
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_head(NULL), _tail(NULL), _count(0) {} |
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|
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G1RedirtyCardsBufferList::G1RedirtyCardsBufferList(BufferNode* head, |
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BufferNode* tail, |
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size_t count) : |
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_head(head), _tail(tail), _count(count) |
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{ |
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assert((_head == NULL) == (_tail == NULL), "invariant"); |
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assert((_head == NULL) == (_count == 0), "invariant"); |
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} |
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|
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// G1RedirtyCardsQueueBase::LocalQSet |
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|
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G1RedirtyCardsQueueBase::LocalQSet::LocalQSet(G1RedirtyCardsQueueSet* shared_qset) : |
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PtrQueueSet(), |
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_shared_qset(shared_qset), |
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_buffers() |
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{ |
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PtrQueueSet::initialize(_shared_qset->allocator()); |
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} |
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|
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G1RedirtyCardsQueueBase::LocalQSet::~LocalQSet() { |
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assert(_buffers._head == NULL, "unflushed qset"); |
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assert(_buffers._tail == NULL, "invariant"); |
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assert(_buffers._count == 0, "invariant"); |
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} |
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|
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void G1RedirtyCardsQueueBase::LocalQSet::enqueue_completed_buffer(BufferNode* node) { |
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++_buffers._count; |
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node->set_next(_buffers._head); |
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_buffers._head = node; |
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if (_buffers._tail == NULL) { |
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_buffers._tail = node; |
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} |
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} |
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G1RedirtyCardsBufferList |
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G1RedirtyCardsQueueBase::LocalQSet::take_all_completed_buffers() { |
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G1RedirtyCardsBufferList result = _buffers; |
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_buffers = G1RedirtyCardsBufferList(); |
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return result; |
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} |
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|
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void G1RedirtyCardsQueueBase::LocalQSet::flush() { |
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_shared_qset->merge_bufferlist(this); |
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} |
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|
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// G1RedirtyCardsQueue |
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|
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G1RedirtyCardsQueue::G1RedirtyCardsQueue(G1RedirtyCardsQueueSet* qset) : |
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G1RedirtyCardsQueueBase(qset), // Init _local_qset before passing to PtrQueue. |
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PtrQueue(&_local_qset, true /* active (always) */) |
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{} |
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|
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G1RedirtyCardsQueue::~G1RedirtyCardsQueue() { |
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flush(); |
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} |
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void G1RedirtyCardsQueue::handle_completed_buffer() { |
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enqueue_completed_buffer(); |
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} |
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|
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void G1RedirtyCardsQueue::flush() { |
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flush_impl(); |
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_local_qset.flush(); |
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} |
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|
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// G1RedirtyCardsQueueSet |
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|
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G1RedirtyCardsQueueSet::G1RedirtyCardsQueueSet() : |
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PtrQueueSet(), |
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_list(), |
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_count(0), |
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_tail(NULL) |
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DEBUG_ONLY(COMMA _collecting(true)) |
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{} |
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|
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G1RedirtyCardsQueueSet::~G1RedirtyCardsQueueSet() { |
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verify_empty(); |
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} |
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|
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#ifdef ASSERT |
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void G1RedirtyCardsQueueSet::verify_empty() const { |
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assert(_list.empty(), "precondition"); |
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assert(_tail == NULL, "invariant"); |
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assert(_count == 0, "invariant"); |
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} |
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#endif // ASSERT |
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|
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BufferNode* G1RedirtyCardsQueueSet::all_completed_buffers() const { |
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DEBUG_ONLY(_collecting = false;) |
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return _list.top(); |
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} |
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G1RedirtyCardsBufferList G1RedirtyCardsQueueSet::take_all_completed_buffers() { |
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DEBUG_ONLY(_collecting = false;) |
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G1RedirtyCardsBufferList result(_list.pop_all(), _tail, _count); |
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_tail = NULL; |
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_count = 0; |
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DEBUG_ONLY(_collecting = true;) |
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return result; |
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} |
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|
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void G1RedirtyCardsQueueSet::update_tail(BufferNode* node) { |
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// Node is the tail of a (possibly single element) list just prepended to |
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// _list. If, after that prepend, node's follower is NULL, then node is |
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// also the tail of _list, so record it as such. |
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if (node->next() == NULL) { |
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assert(_tail == NULL, "invariant"); |
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_tail = node; |
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} |
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} |
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|
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void G1RedirtyCardsQueueSet::enqueue_completed_buffer(BufferNode* node) { |
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assert(_collecting, "precondition"); |
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Atomic::inc(&_count); |
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_list.push(*node); |
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update_tail(node); |
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} |
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|
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void G1RedirtyCardsQueueSet::merge_bufferlist(LocalQSet* src) { |
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assert(_collecting, "precondition"); |
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const G1RedirtyCardsBufferList from = src->take_all_completed_buffers(); |
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if (from._head != NULL) { |
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assert(from._tail != NULL, "invariant"); |
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Atomic::add(from._count, &_count); |
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_list.prepend(*from._head, *from._tail); |
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update_tail(from._tail); |
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} |
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} |