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annotate Modules/bsddb.h @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents 64ba5240af31
children 96a241d4a0ab
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1 /*----------------------------------------------------------------------
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2 Copyright (c) 1999-2001, Digital Creations, Fredericksburg, VA, USA
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3 and Andrew Kuchling. All rights reserved.
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4
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5 Redistribution and use in source and binary forms, with or without
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6 modification, are permitted provided that the following conditions are
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7 met:
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8
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9 o Redistributions of source code must retain the above copyright
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10 notice, this list of conditions, and the disclaimer that follows.
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12 o Redistributions in binary form must reproduce the above copyright
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13 notice, this list of conditions, and the following disclaimer in
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14 the documentation and/or other materials provided with the
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15 distribution.
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17 o Neither the name of Digital Creations nor the names of its
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18 contributors may be used to endorse or promote products derived
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19 from this software without specific prior written permission.
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20
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21 THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS AND CONTRIBUTORS *AS
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22 IS* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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23 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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24 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DIGITAL
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25 CREATIONS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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26 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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27 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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28 OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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29 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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30 TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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31 USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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32 DAMAGE.
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33 ------------------------------------------------------------------------*/
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34
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36 /*
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37 * Handwritten code to wrap version 3.x of the Berkeley DB library,
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38 * written to replace a SWIG-generated file. It has since been updated
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39 * to compile with Berkeley DB versions 3.2 through 4.2.
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40 *
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41 * This module was started by Andrew Kuchling to remove the dependency
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42 * on SWIG in a package by Gregory P. Smith who based his work on a
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43 * similar package by Robin Dunn <robin@alldunn.com> which wrapped
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44 * Berkeley DB 2.7.x.
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45 *
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46 * Development of this module then returned full circle back to Robin Dunn
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47 * who worked on behalf of Digital Creations to complete the wrapping of
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48 * the DB 3.x API and to build a solid unit test suite. Robin has
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49 * since gone onto other projects (wxPython).
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50 *
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51 * Gregory P. Smith <greg@krypto.org> is once again the maintainer.
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52 *
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53 * Use the pybsddb-users@lists.sf.net mailing list for all questions.
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54 * Things can change faster than the header of this file is updated. This
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55 * file is shared with the PyBSDDB project at SourceForge:
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56 *
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57 * http://pybsddb.sf.net
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58 *
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59 * This file should remain backward compatible with Python 2.1, but see PEP
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60 * 291 for the most current backward compatibility requirements:
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61 *
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62 * http://www.python.org/peps/pep-0291.html
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63 *
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64 * This module contains 6 types:
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65 *
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66 * DB (Database)
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67 * DBCursor (Database Cursor)
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68 * DBEnv (database environment)
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69 * DBTxn (An explicit database transaction)
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70 * DBLock (A lock handle)
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71 * DBSequence (Sequence)
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72 *
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73 */
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74
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75 /* --------------------------------------------------------------------- */
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76
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77 /*
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78 * Portions of this module, associated unit tests and build scripts are the
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79 * result of a contract with The Written Word (http://thewrittenword.com/)
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80 * Many thanks go out to them for causing me to raise the bar on quality and
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81 * functionality, resulting in a better bsddb3 package for all of us to use.
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82 *
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83 * --Robin
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84 */
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85
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86 /* --------------------------------------------------------------------- */
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87
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88 /*
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89 * Work to split it up into a separate header and to add a C API was
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90 * contributed by Duncan Grisby <duncan@tideway.com>. See here:
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91 * http://sourceforge.net/tracker/index.php?func=detail&aid=1551895&group_id=13900&atid=313900
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92 */
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93
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94 /* --------------------------------------------------------------------- */
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95
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96 #ifndef _BSDDB_H_
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97 #define _BSDDB_H_
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98
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99 #include <db.h>
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100
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101
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102 /* 40 = 4.0, 33 = 3.3; this will break if the minor revision is > 9 */
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103 #define DBVER (DB_VERSION_MAJOR * 10 + DB_VERSION_MINOR)
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104 #if DB_VERSION_MINOR > 9
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105 #error "eek! DBVER can't handle minor versions > 9"
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106 #endif
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107
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108 #define PY_BSDDB_VERSION "4.7.3"
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109
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110 /* Python object definitions */
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111
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112 struct behaviourFlags {
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113 /* What is the default behaviour when DB->get or DBCursor->get returns a
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114 DB_NOTFOUND || DB_KEYEMPTY error? Return None or raise an exception? */
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115 unsigned int getReturnsNone : 1;
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116 /* What is the default behaviour for DBCursor.set* methods when DBCursor->get
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117 * returns a DB_NOTFOUND || DB_KEYEMPTY error? Return None or raise? */
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118 unsigned int cursorSetReturnsNone : 1;
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119 };
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120
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121
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122
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123 struct DBObject; /* Forward declaration */
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124 struct DBCursorObject; /* Forward declaration */
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125 struct DBTxnObject; /* Forward declaration */
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126 struct DBSequenceObject; /* Forward declaration */
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127
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128 typedef struct {
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129 PyObject_HEAD
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130 DB_ENV* db_env;
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131 u_int32_t flags; /* saved flags from open() */
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132 int closed;
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133 struct behaviourFlags moduleFlags;
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134 PyObject* event_notifyCallback;
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135 struct DBObject *children_dbs;
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136 struct DBTxnObject *children_txns;
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137 PyObject *private_obj;
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138 PyObject *rep_transport;
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139 PyObject *in_weakreflist; /* List of weak references */
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140 } DBEnvObject;
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141
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142 typedef struct DBObject {
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143 PyObject_HEAD
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144 DB* db;
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145 DBEnvObject* myenvobj; /* PyObject containing the DB_ENV */
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146 u_int32_t flags; /* saved flags from open() */
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147 u_int32_t setflags; /* saved flags from set_flags() */
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148 int haveStat;
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149 struct behaviourFlags moduleFlags;
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150 struct DBTxnObject *txn;
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151 struct DBCursorObject *children_cursors;
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152 #if (DBVER >=43)
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153 struct DBSequenceObject *children_sequences;
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154 #endif
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155 struct DBObject **sibling_prev_p;
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156 struct DBObject *sibling_next;
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157 struct DBObject **sibling_prev_p_txn;
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158 struct DBObject *sibling_next_txn;
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159 PyObject* associateCallback;
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160 PyObject* btCompareCallback;
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161 int primaryDBType;
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162 PyObject *private_obj;
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163 PyObject *in_weakreflist; /* List of weak references */
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164 } DBObject;
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165
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166
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167 typedef struct DBCursorObject {
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168 PyObject_HEAD
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169 DBC* dbc;
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170 struct DBCursorObject **sibling_prev_p;
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171 struct DBCursorObject *sibling_next;
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172 struct DBCursorObject **sibling_prev_p_txn;
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173 struct DBCursorObject *sibling_next_txn;
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174 DBObject* mydb;
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175 struct DBTxnObject *txn;
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176 PyObject *in_weakreflist; /* List of weak references */
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177 } DBCursorObject;
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178
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179
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180 typedef struct DBTxnObject {
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181 PyObject_HEAD
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182 DB_TXN* txn;
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183 DBEnvObject* env;
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184 int flag_prepare;
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185 struct DBTxnObject *parent_txn;
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186 struct DBTxnObject **sibling_prev_p;
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187 struct DBTxnObject *sibling_next;
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188 struct DBTxnObject *children_txns;
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189 struct DBObject *children_dbs;
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190 struct DBSequenceObject *children_sequences;
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191 struct DBCursorObject *children_cursors;
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192 PyObject *in_weakreflist; /* List of weak references */
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193 } DBTxnObject;
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194
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195
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196 typedef struct {
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197 PyObject_HEAD
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198 DB_LOCK lock;
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199 PyObject *in_weakreflist; /* List of weak references */
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200 } DBLockObject;
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201
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202
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203 #if (DBVER >= 43)
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204 typedef struct DBSequenceObject {
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205 PyObject_HEAD
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206 DB_SEQUENCE* sequence;
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207 DBObject* mydb;
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208 struct DBTxnObject *txn;
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209 struct DBSequenceObject **sibling_prev_p;
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210 struct DBSequenceObject *sibling_next;
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211 struct DBSequenceObject **sibling_prev_p_txn;
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212 struct DBSequenceObject *sibling_next_txn;
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213 PyObject *in_weakreflist; /* List of weak references */
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214 } DBSequenceObject;
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215 #endif
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216
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217
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218 /* API structure for use by C code */
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219
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220 /* To access the structure from an external module, use code like the
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221 following (error checking missed out for clarity):
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222
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223 BSDDB_api* bsddb_api;
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224 PyObject* mod;
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225 PyObject* cobj;
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226
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227 mod = PyImport_ImportModule("bsddb._bsddb");
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228 // Use "bsddb3._pybsddb" if you're using the standalone pybsddb add-on.
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229 cobj = PyObject_GetAttrString(mod, "api");
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230 api = (BSDDB_api*)PyCObject_AsVoidPtr(cobj);
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231 Py_DECREF(cobj);
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232 Py_DECREF(mod);
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233
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234 The structure's members must not be changed.
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235 */
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236
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237 typedef struct {
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238 /* Type objects */
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239 PyTypeObject* db_type;
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240 PyTypeObject* dbcursor_type;
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241 PyTypeObject* dbenv_type;
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242 PyTypeObject* dbtxn_type;
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243 PyTypeObject* dblock_type;
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244 #if (DBVER >= 43)
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245 PyTypeObject* dbsequence_type;
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246 #endif
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247
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248 /* Functions */
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249 int (*makeDBError)(int err);
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250
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251 } BSDDB_api;
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252
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253
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254 #ifndef COMPILING_BSDDB_C
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255
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256 /* If not inside _bsddb.c, define type check macros that use the api
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257 structure. The calling code must have a value named bsddb_api
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258 pointing to the api structure.
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259 */
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260
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261 #define DBObject_Check(v) ((v)->ob_type == bsddb_api->db_type)
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262 #define DBCursorObject_Check(v) ((v)->ob_type == bsddb_api->dbcursor_type)
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263 #define DBEnvObject_Check(v) ((v)->ob_type == bsddb_api->dbenv_type)
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264 #define DBTxnObject_Check(v) ((v)->ob_type == bsddb_api->dbtxn_type)
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265 #define DBLockObject_Check(v) ((v)->ob_type == bsddb_api->dblock_type)
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266 #if (DBVER >= 43)
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267 #define DBSequenceObject_Check(v) ((v)->ob_type == bsddb_api->dbsequence_type)
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268 #endif
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269
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270 #endif /* COMPILING_BSDDB_C */
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271
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272
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273 #endif /* _BSDDB_H_ */