fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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123 lines
4.1 KiB
123 lines
4.1 KiB
/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
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#ident "$Id$"
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/*======
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This file is part of PerconaFT.
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Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.
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PerconaFT is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2,
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as published by the Free Software Foundation.
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PerconaFT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with PerconaFT. If not, see <http://www.gnu.org/licenses/>.
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----------------------------------------
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PerconaFT is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License, version 3,
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as published by the Free Software Foundation.
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PerconaFT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with PerconaFT. If not, see <http://www.gnu.org/licenses/>.
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----------------------------------------
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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======= */
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#ident \
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"Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."
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#pragma once
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#include <functional>
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#include "../util/omt.h"
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#include "txnid_set.h"
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namespace toku {
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// A wfg is a 'wait-for' graph. A directed edge in represents one
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// txn waiting for another to finish before it can acquire a lock.
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class wfg {
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public:
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// Create a lock request graph
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void create(void);
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// Destroy the internals of the lock request graph
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void destroy(void);
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// Add an edge (a_id, b_id) to the graph
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void add_edge(TXNID a_txnid, TXNID b_txnid);
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// Return true if a node with the given transaction id exists in the graph.
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// Return false otherwise.
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bool node_exists(TXNID txnid);
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// Return true if there exists a cycle from a given transaction id in the
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// graph. Return false otherwise.
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bool cycle_exists_from_txnid(TXNID txnid,
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std::function<void(TXNID)> reporter);
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// Apply a given function f to all of the nodes in the graph. The apply
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// function returns when the function f is called for all of the nodes in the
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// graph, or the function f returns non-zero.
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void apply_nodes(int (*fn)(TXNID txnid, void *extra), void *extra);
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// Apply a given function f to all of the edges whose origin is a given node
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// id. The apply function returns when the function f is called for all edges
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// in the graph rooted at node id, or the function f returns non-zero.
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void apply_edges(TXNID txnid,
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int (*fn)(TXNID txnid, TXNID edge_txnid, void *extra),
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void *extra);
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private:
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struct node {
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// txnid for this node and the associated set of edges
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TXNID txnid;
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txnid_set edges;
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bool visited;
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static node *alloc(TXNID txnid);
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static void free(node *n);
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};
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ENSURE_POD(node);
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toku::omt<node *> m_nodes;
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node *find_node(TXNID txnid);
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node *find_create_node(TXNID txnid);
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bool cycle_exists_from_node(node *target, node *head,
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std::function<void(TXNID)> reporter);
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static int find_by_txnid(node *const &node_a, const TXNID &txnid_b);
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};
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ENSURE_POD(wfg);
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} /* namespace toku */
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