wasCSharpSQLite – Blame information for rev 1
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1 | office | 1 | using System; |
2 | using System.Diagnostics; |
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3 | using System.IO; |
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4 | |||
5 | using i16 = System.Int16; |
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6 | using u32 = System.UInt32; |
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7 | using Pgno = System.UInt32; |
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8 | |||
9 | namespace Community.CsharpSqlite |
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10 | { |
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11 | public partial class Sqlite3 |
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12 | { |
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13 | /* |
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14 | ** 2008 August 05 |
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15 | ** |
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16 | ** The author disclaims copyright to this source code. In place of |
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17 | ** a legal notice, here is a blessing: |
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18 | ** |
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19 | ** May you do good and not evil. |
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20 | ** May you find forgiveness for yourself and forgive others. |
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21 | ** May you share freely, never taking more than you give. |
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22 | ** |
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23 | ************************************************************************* |
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24 | ** This header file defines the interface that the sqlite page cache |
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25 | ** subsystem. |
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26 | ************************************************************************* |
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27 | ** Included in SQLite3 port to C#-SQLite; 2008 Noah B Hart |
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28 | ** C#-SQLite is an independent reimplementation of the SQLite software library |
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29 | ** |
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30 | ** SQLITE_SOURCE_ID: 2010-08-23 18:52:01 42537b60566f288167f1b5864a5435986838e3a3 |
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31 | ** |
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32 | ************************************************************************* |
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33 | */ |
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34 | |||
35 | #if !_PCACHE_H_ |
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36 | |||
37 | //typedef struct PgHdr PgHdr; |
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38 | //typedef struct PCache PCache; |
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39 | |||
40 | /* |
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41 | ** Every page in the cache is controlled by an instance of the following |
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42 | ** structure. |
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43 | */ |
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44 | public class PgHdr |
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45 | { |
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46 | public byte[] pData; /* Content of this page */ |
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47 | public MemPage pExtra; /* Extra content */ |
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48 | public PgHdr pDirty; /* Transient list of dirty pages */ |
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49 | public Pgno pgno; /* The page number for this page */ |
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50 | public Pager pPager; /* The pager to which this page belongs */ |
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51 | #if SQLITE_CHECK_PAGES || (SQLITE_DEBUG) |
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52 | public int pageHash; /* Hash of page content */ |
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53 | #endif |
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54 | public int flags; /* PGHDR flags defined below */ |
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55 | /********************************************************************** |
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56 | ** Elements above are public. All that follows is private to pcache.c |
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57 | ** and should not be accessed by other modules. |
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58 | */ |
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59 | public int nRef; /* Number of users of this page */ |
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60 | public PCache pCache; /* Cache that owns this page */ |
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61 | public bool CacheAllocated; /* True, if allocated from cache */ |
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62 | |||
63 | public PgHdr pDirtyNext; /* Next element in list of dirty pages */ |
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64 | public PgHdr pDirtyPrev; /* Previous element in list of dirty pages */ |
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65 | public PgHdr1 pPgHdr1; /* Cache page header this this page */ |
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66 | |||
67 | public static implicit operator bool( PgHdr b ) |
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68 | { |
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69 | return ( b != null ); |
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70 | } |
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71 | |||
72 | |||
73 | public void Clear() |
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74 | { |
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75 | sqlite3_free( ref this.pData ); |
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76 | this.pData = null; |
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77 | this.pExtra = null; |
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78 | this.pDirty = null; |
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79 | this.pgno = 0; |
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80 | this.pPager = null; |
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81 | #if SQLITE_CHECK_PAGES |
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82 | this.pageHash=0; |
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83 | #endif |
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84 | this.flags = 0; |
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85 | this.nRef = 0; |
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86 | this.CacheAllocated = false; |
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87 | this.pCache = null; |
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88 | this.pDirtyNext = null; |
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89 | this.pDirtyPrev = null; |
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90 | this.pPgHdr1 = null; |
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91 | } |
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92 | }; |
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93 | |||
94 | /* Bit values for PgHdr.flags */ |
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95 | //#define PGHDR_DIRTY 0x002 /* Page has changed */ |
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96 | //#define PGHDR_NEED_SYNC 0x004 /* Fsync the rollback journal before |
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97 | // ** writing this page to the database */ |
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98 | //#define PGHDR_NEED_READ 0x008 /* Content is unread */ |
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99 | //#define PGHDR_REUSE_UNLIKELY 0x010 /* A hint that reuse is unlikely */ |
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100 | //#define PGHDR_DONT_WRITE 0x020 /* Do not write content to disk */ |
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101 | |||
102 | const int PGHDR_DIRTY = 0x002; /* Page has changed */ |
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103 | const int PGHDR_NEED_SYNC = 0x004;/* Fsync the rollback journal before |
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104 | ** writing this page to the database */ |
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105 | const int PGHDR_NEED_READ = 0x008;/* Content is unread */ |
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106 | const int PGHDR_REUSE_UNLIKELY = 0x010;/* A hint that reuse is unlikely */ |
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107 | const int PGHDR_DONT_WRITE = 0x020;/* Do not write content to disk */ |
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108 | |||
109 | /* Initialize and shutdown the page cache subsystem */ |
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110 | //int sqlite3PcacheInitialize(void); |
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111 | //void sqlite3PcacheShutdown(void); |
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112 | |||
113 | /* Page cache buffer management: |
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114 | ** These routines implement SQLITE_CONFIG_PAGECACHE. |
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115 | */ |
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116 | //void sqlite3PCacheBufferSetup(void *, int sz, int n); |
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117 | |||
118 | /* Create a new pager cache. |
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119 | ** Under memory stress, invoke xStress to try to make pages clean. |
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120 | ** Only clean and unpinned pages can be reclaimed. |
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121 | */ |
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122 | //void sqlite3PcacheOpen( |
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123 | // int szPage, /* Size of every page */ |
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124 | // int szExtra, /* Extra space associated with each page */ |
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125 | // int bPurgeable, /* True if pages are on backing store */ |
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126 | // int (*xStress)(void*, PgHdr*), /* Call to try to make pages clean */ |
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127 | // void pStress, /* Argument to xStress */ |
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128 | // PCache pToInit /* Preallocated space for the PCache */ |
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129 | //); |
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130 | |||
131 | /* Modify the page-size after the cache has been created. */ |
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132 | //void sqlite3PcacheSetPageSize(PCache *, int); |
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133 | |||
134 | /* Return the size in bytes of a PCache object. Used to preallocate |
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135 | ** storage space. |
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136 | */ |
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137 | //int sqlite3PcacheSize(void); |
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138 | |||
139 | /* One release per successful fetch. Page is pinned until released. |
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140 | ** Reference counted. |
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141 | */ |
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142 | //int sqlite3PcacheFetch(PCache*, Pgno, int createFlag, PgHdr**); |
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143 | //void sqlite3PcacheRelease(PgHdr*); |
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144 | |||
145 | //void sqlite3PcacheDrop(PgHdr*); /* Remove page from cache */ |
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146 | //void sqlite3PcacheMakeDirty(PgHdr*); /* Make sure page is marked dirty */ |
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147 | //void sqlite3PcacheMakeClean(PgHdr*); /* Mark a single page as clean */ |
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148 | //void sqlite3PcacheCleanAll(PCache*); /* Mark all dirty list pages as clean */ |
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149 | |||
150 | /* Change a page number. Used by incr-vacuum. */ |
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151 | //void sqlite3PcacheMove(PgHdr*, Pgno); |
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152 | |||
153 | /* Remove all pages with pgno>x. Reset the cache if x==0 */ |
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154 | //void sqlite3PcacheTruncate(PCache*, Pgno x); |
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155 | |||
156 | /* Get a list of all dirty pages in the cache, sorted by page number */ |
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157 | //PgHdr *sqlite3PcacheDirtyList(PCache*); |
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158 | |||
159 | /* Reset and close the cache object */ |
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160 | //void sqlite3PcacheClose(PCache*); |
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161 | |||
162 | /* Clear flags from pages of the page cache */ |
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163 | //void sqlite3PcacheClearSyncFlags(PCache *); |
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164 | |||
165 | /* Discard the contents of the cache */ |
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166 | //void sqlite3PcacheClear(PCache*); |
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167 | |||
168 | /* Return the total number of outstanding page references */ |
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169 | //int sqlite3PcacheRefCount(PCache*); |
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170 | |||
171 | /* Increment the reference count of an existing page */ |
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172 | //void sqlite3PcacheRef(PgHdr*); |
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173 | |||
174 | //int sqlite3PcachePageRefcount(PgHdr*); |
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175 | |||
176 | |||
177 | /* Return the total number of pages stored in the cache */ |
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178 | //int sqlite3PcachePagecount(PCache*); |
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179 | |||
180 | #if SQLITE_CHECK_PAGES |
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181 | /* Iterate through all dirty pages currently stored in the cache. This |
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182 | ** interface is only available if SQLITE_CHECK_PAGES is defined when the |
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183 | ** library is built. |
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184 | */ |
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185 | |||
186 | //void sqlite3PcacheIterateDirty(PCache pCache, void (*xIter)(PgHdr *)); |
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187 | #endif |
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188 | |||
189 | /* Set and get the suggested cache-size for the specified pager-cache. |
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190 | ** |
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191 | ** If no global maximum is configured, then the system attempts to limit |
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192 | ** the total number of pages cached by purgeable pager-caches to the sum |
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193 | ** of the suggested cache-sizes. |
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194 | */ |
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195 | //void sqlite3PcacheSetCachesize(PCache *, int); |
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196 | #if SQLITE_TEST |
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197 | //int sqlite3PcacheGetCachesize(PCache *); |
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198 | #endif |
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199 | |||
200 | #if SQLITE_ENABLE_MEMORY_MANAGEMENT |
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201 | /* Try to return memory used by the pcache module to the main memory heap */ |
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202 | //int sqlite3PcacheReleaseMemory(int); |
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203 | #endif |
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204 | |||
205 | #if SQLITE_TEST |
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206 | //void sqlite3PcacheStats(int*,int*,int*,int*); |
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207 | #endif |
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208 | |||
209 | //void sqlite3PCacheSetDefault(void); |
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210 | |||
211 | #endif //* _PCACHE_H_ */ |
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212 | } |
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213 | } |