ceph/src/rocksdb/utilities/transactions/lock/range/range_tree/lib/locktree/txnid_set.cc

   1 /* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
   2 // vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
   3 #ifndef ROCKSDB_LITE
   4 #ifndef OS_WIN
   5 #ident "$Id$"
   6 /*======
   7 This file is part of PerconaFT.
   8
   9
  10 Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.
  11
  12     PerconaFT is free software: you can redistribute it and/or modify
  13     it under the terms of the GNU General Public License, version 2,
  14     as published by the Free Software Foundation.
  15
  16     PerconaFT is distributed in the hope that it will be useful,
  17     but WITHOUT ANY WARRANTY; without even the implied warranty of
  18     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19     GNU General Public License for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ----------------------------------------
  25
  26     PerconaFT is free software: you can redistribute it and/or modify
  27     it under the terms of the GNU Affero General Public License, version 3,
  28     as published by the Free Software Foundation.
  29
  30     PerconaFT is distributed in the hope that it will be useful,
  31     but WITHOUT ANY WARRANTY; without even the implied warranty of
  32     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33     GNU Affero General Public License for more details.
  34
  35     You should have received a copy of the GNU Affero General Public License
  36     along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.
  37
  38 ----------------------------------------
  39
  40    Licensed under the Apache License, Version 2.0 (the "License");
  41    you may not use this file except in compliance with the License.
  42    You may obtain a copy of the License at
  43
  44        http://www.apache.org/licenses/LICENSE-2.0
  45
  46    Unless required by applicable law or agreed to in writing, software
  47    distributed under the License is distributed on an "AS IS" BASIS,
  48    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  49    See the License for the specific language governing permissions and
  50    limitations under the License.
  51 ======= */
  52
  53 #ident \
  54     "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."
  55
  56 #include "txnid_set.h"
  57
  58 #include "../db.h"
  59
  60 namespace toku {
  61
  62 int find_by_txnid(const TXNID &txnid_a, const TXNID &txnid_b);
  63 int find_by_txnid(const TXNID &txnid_a, const TXNID &txnid_b) {
  64   if (txnid_a < txnid_b) {
  65     return -1;
  66   } else if (txnid_a == txnid_b) {
  67     return 0;
  68   } else {
  69     return 1;
  70   }
  71 }
  72
  73 void txnid_set::create(void) {
  74   // lazily allocate the underlying omt, since it is common
  75   // to create a txnid set and never put anything in it.
  76   m_txnids.create_no_array();
  77 }
  78
  79 void txnid_set::destroy(void) { m_txnids.destroy(); }
  80
  81 // Return true if the given transaction id is a member of the set.
  82 // Otherwise, return false.
  83 bool txnid_set::contains(TXNID txnid) const {
  84   TXNID find_txnid;
  85   int r = m_txnids.find_zero<TXNID, find_by_txnid>(txnid, &find_txnid, nullptr);
  86   return r == 0 ? true : false;
  87 }
  88
  89 // Add a given txnid to the set
  90 void txnid_set::add(TXNID txnid) {
  91   int r = m_txnids.insert<TXNID, find_by_txnid>(txnid, txnid, nullptr);
  92   invariant(r == 0 || r == DB_KEYEXIST);
  93 }
  94
  95 // Delete a given txnid from the set.
  96 void txnid_set::remove(TXNID txnid) {
  97   uint32_t idx;
  98   int r = m_txnids.find_zero<TXNID, find_by_txnid>(txnid, nullptr, &idx);
  99   if (r == 0) {
 100     r = m_txnids.delete_at(idx);
 101     invariant_zero(r);
 102   }
 103 }
 104
 105 // Return the size of the set
 106 uint32_t txnid_set::size(void) const { return m_txnids.size(); }
 107
 108 // Get the ith id in the set, assuming that the set is sorted.
 109 TXNID txnid_set::get(uint32_t i) const {
 110   TXNID txnid;
 111   int r = m_txnids.fetch(i, &txnid);
 112   if (r == EINVAL) /* Shouldn't happen, avoid compiler warning */
 113     return TXNID_NONE;
 114   invariant_zero(r);
 115   return txnid;
 116 }
 117
 118 } /* namespace toku */
 119 #endif  // OS_WIN
 120 #endif  // ROCKSDB_LITE