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241 lines
8.2 KiB
C++
241 lines
8.2 KiB
C++
/* -*- 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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COPYING CONDITIONS NOTICE:
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This program is free software; you can redistribute it and/or modify
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it under the terms of version 2 of the GNU General Public License as
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published by the Free Software Foundation, and provided that the
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following conditions are met:
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* Redistributions of source code must retain this COPYING
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CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
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DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
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PATENT MARKING NOTICE (below), and the PATENT RIGHTS
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GRANT (below).
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* Redistributions in binary form must reproduce this COPYING
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CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
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DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
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PATENT MARKING NOTICE (below), and the PATENT RIGHTS
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GRANT (below) in the documentation and/or other materials
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provided with the distribution.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA.
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COPYRIGHT NOTICE:
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TokuFT, Tokutek Fractal Tree Indexing Library.
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Copyright (C) 2007-2013 Tokutek, Inc.
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DISCLAIMER:
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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UNIVERSITY PATENT NOTICE:
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The technology is licensed by the Massachusetts Institute of
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Technology, Rutgers State University of New Jersey, and the Research
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Foundation of State University of New York at Stony Brook under
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United States of America Serial No. 11/760379 and to the patents
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and/or patent applications resulting from it.
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PATENT MARKING NOTICE:
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This software is covered by US Patent No. 8,185,551.
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This software is covered by US Patent No. 8,489,638.
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PATENT RIGHTS GRANT:
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"THIS IMPLEMENTATION" means the copyrightable works distributed by
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Tokutek as part of the Fractal Tree project.
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"PATENT CLAIMS" means the claims of patents that are owned or
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licensable by Tokutek, both currently or in the future; and that in
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the absence of this license would be infringed by THIS
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IMPLEMENTATION or by using or running THIS IMPLEMENTATION.
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"PATENT CHALLENGE" shall mean a challenge to the validity,
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patentability, enforceability and/or non-infringement of any of the
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PATENT CLAIMS or otherwise opposing any of the PATENT CLAIMS.
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Tokutek hereby grants to you, for the term and geographical scope of
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the PATENT CLAIMS, a non-exclusive, no-charge, royalty-free,
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irrevocable (except as stated in this section) patent license to
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make, have made, use, offer to sell, sell, import, transfer, and
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otherwise run, modify, and propagate the contents of THIS
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IMPLEMENTATION, where such license applies only to the PATENT
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CLAIMS. This grant does not include claims that would be infringed
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only as a consequence of further modifications of THIS
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IMPLEMENTATION. If you or your agent or licensee institute or order
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or agree to the institution of patent litigation against any entity
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(including a cross-claim or counterclaim in a lawsuit) alleging that
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THIS IMPLEMENTATION constitutes direct or contributory patent
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infringement, or inducement of patent infringement, then any rights
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granted to you under this License shall terminate as of the date
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such litigation is filed. If you or your agent or exclusive
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licensee institute or order or agree to the institution of a PATENT
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CHALLENGE, then Tokutek may terminate any rights granted to you
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under this License.
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*/
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#ident "Copyright (c) 2007-2013 Tokutek Inc. All rights reserved."
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#ident "The technology is licensed by the Massachusetts Institute of Technology, Rutgers State University of New Jersey, and the Research Foundation of State University of New York at Stony Brook under United States of America Serial No. 11/760379 and to the patents and/or patent applications resulting from it."
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#include <db.h>
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#include <toku_assert.h>
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#include <memory.h>
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#include <string.h>
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#include "txnid_set.h"
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#include "wfg.h"
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namespace toku {
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// Create a lock request graph
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void wfg::create(void) {
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m_nodes.create();
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}
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// Destroy the internals of the lock request graph
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void wfg::destroy(void) {
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size_t n_nodes = m_nodes.size();
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for (size_t i = 0; i < n_nodes; i++) {
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node *n;
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int r = m_nodes.fetch(i, &n);
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invariant_zero(r);
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invariant_notnull(n);
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node::free(n);
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}
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m_nodes.destroy();
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}
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// Add an edge (a_id, b_id) to the graph
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void wfg::add_edge(TXNID a_txnid, TXNID b_txnid) {
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node *a_node = find_create_node(a_txnid);
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node *b_node = find_create_node(b_txnid);
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a_node->edges.add(b_node->txnid);
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}
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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 wfg::node_exists(TXNID txnid) {
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node *n = find_node(txnid);
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return n != NULL;
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}
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bool wfg::cycle_exists_from_node(node *target, node *head) {
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bool cycle_found = false;
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head->visited = true;
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size_t n_edges = head->edges.size();
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for (size_t i = 0; i < n_edges && !cycle_found; i++) {
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TXNID edge_id = head->edges.get(i);
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if (target->txnid == edge_id) {
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cycle_found = true;
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} else {
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node *new_head = find_node(edge_id);
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if (new_head && !new_head->visited) {
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cycle_found = cycle_exists_from_node(target, new_head);
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}
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}
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}
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head->visited = false;
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return cycle_found;
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}
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// Return true if there exists a cycle from a given transaction id in the graph.
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// Return false otherwise.
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bool wfg::cycle_exists_from_txnid(TXNID txnid) {
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node *a_node = find_node(txnid);
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bool cycles_found = false;
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if (a_node) {
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cycles_found = cycle_exists_from_node(a_node, a_node);
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}
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return cycles_found;
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}
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// Apply a given function f to all of the nodes in the graph. The apply function
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// returns when the function f is called for all of the nodes in the graph, or the
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// function f returns non-zero.
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void wfg::apply_nodes(int (*fn)(TXNID id, void *extra), void *extra) {
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int r = 0;
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size_t n_nodes = m_nodes.size();
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for (size_t i = 0; i < n_nodes && r == 0; i++) {
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node *n;
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r = m_nodes.fetch(i, &n);
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invariant_zero(r);
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r = fn(n->txnid, extra);
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}
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}
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// Apply a given function f to all of the edges whose origin is a given node id.
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// The apply function returns when the function f is called for all edges in the
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// graph rooted at node id, or the function f returns non-zero.
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void wfg::apply_edges(TXNID txnid,
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int (*fn)(TXNID txnid, TXNID edge_txnid, void *extra), void *extra) {
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node *n = find_node(txnid);
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if (n) {
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int r = 0;
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size_t n_edges = n->edges.size();
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for (size_t i = 0; i < n_edges && r == 0; i++) {
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r = fn(txnid, n->edges.get(i), extra);
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}
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}
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}
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// find node by id
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wfg::node *wfg::find_node(TXNID txnid) {
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node *n = nullptr;
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int r = m_nodes.find_zero<TXNID, find_by_txnid>(txnid, &n, nullptr);
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invariant(r == 0 || r == DB_NOTFOUND);
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return n;
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}
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// this is the omt comparison function
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// nodes are compared by their txnid.
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int wfg::find_by_txnid(node *const &node_a, const TXNID &txnid_b) {
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TXNID txnid_a = node_a->txnid;
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if (txnid_a < txnid_b) {
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return -1;
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} else if (txnid_a == txnid_b) {
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return 0;
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} else {
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return 1;
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}
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}
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// insert a new node
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wfg::node *wfg::find_create_node(TXNID txnid) {
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node *n;
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uint32_t idx;
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int r = m_nodes.find_zero<TXNID, find_by_txnid>(txnid, &n, &idx);
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if (r == DB_NOTFOUND) {
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n = node::alloc(txnid);
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r = m_nodes.insert_at(n, idx);
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invariant_zero(r);
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}
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invariant_notnull(n);
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return n;
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}
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wfg::node *wfg::node::alloc(TXNID txnid) {
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node *XCALLOC(n);
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n->txnid = txnid;
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n->visited = false;
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n->edges.create();
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return n;
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}
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void wfg::node::free(wfg::node *n) {
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n->edges.destroy();
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toku_free(n);
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}
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} /* namespace toku */
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