author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 16:57:14 +0300 | |
branch | RCL_3 |
changeset 23 | 26645d81f48d |
parent 0 | 08ec8eefde2f |
child 24 | cc28652e0254 |
permissions | -rw-r--r-- |
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// Copyright (c) 2008-2010 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// The Symbian OS porting layer - multi-threaded implementation. |
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// Platform dependend implementation of the static mutexes and the file session API. |
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// |
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// |
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/** |
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@file |
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*/ |
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#include "os_symbian.h" |
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#include <pls.h> |
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#include <e32std.h> |
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#include "SqliteUtil.h" |
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#include "OstTraceDefinitions.h" |
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#ifdef OST_TRACE_COMPILER_IN_USE |
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#include "os_symbian_emulTraces.h" |
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#endif |
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#include "SqliteTraceDef.h" |
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#ifdef SQLITE_OS_SYMBIAN |
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const TUid KSqliteUid = {0x10285A79};//See UID3 in SQLite3.mmp file - it should be the same |
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/** |
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This class describes an object that serves as a container for SQLite global variables |
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that are stored in an allocated WSD buffer. |
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The global variables are organised in a map, where the pointer to the initial global variable value |
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is used as a key. |
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A hash table is used to speed-up the key search. |
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A single TWsdMap object is created and stored in the process local storage - TPls. |
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@see TPls |
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@internalComponent |
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*/ |
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NONSHARABLE_CLASS(TWsdMap) |
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{ |
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/** |
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Hash table entry. |
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*/ |
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struct TPair |
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{ |
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const TUint8* iKey; //Global variable - key (a pointer the initial variable value) |
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TUint8* iData; //Global variable - data |
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}; |
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public: |
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enum {KBufferSize = 4096}; //WSD buffer size in bytes |
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enum {KMaxEntries = 37}; //Max No. of entries in the hash table - prime number |
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TWsdMap() : |
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iNext(iBuffer), |
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iSize(0) |
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{ |
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Mem::FillZ(iTable, sizeof(iTable)); |
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} |
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/** |
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Performs a search in the map for a global variable with aKey key. |
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If there is no such variable in the map, the variable will be added and the new variable will be initialized |
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with the data of aLength length, pointed by aKey. |
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@param aKey Global variable key |
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@param aLength Global variable data length in bytes |
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@return Pointer to the global variable (located in the WSD buffer) |
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@panic SqliteMt 9 The global variables map is full |
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@panic SqliteMt 10 There is no space in the WSD buffer for the new variable |
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*/ |
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TUint8* Find(const TUint8* aKey, TInt aLength) |
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{ |
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TInt idx = Hash((TUint)aKey); |
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TInt cnt = 0; |
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while(iTable[idx].iKey != aKey && iTable[idx].iKey != NULL && ++cnt < KMaxEntries) |
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{ |
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idx = ++idx % KMaxEntries; |
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} |
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__ASSERT_ALWAYS(cnt < KMaxEntries, __SQLITEPANIC2(ESqliteOsPanicMaxKeysExceeded)); |
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if(!iTable[idx].iKey) |
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{ |
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Add(idx, aKey, aLength); |
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} |
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return iTable[idx].iData; |
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} |
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private: |
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/** |
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Hash function. Calculates the index of the global variable key in the hash table. |
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@param aKey Global variable key (casted "const TUint8*" to "TUint") |
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@return Hash table index |
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*/ |
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TUint Hash(TUint aKey) const |
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{ |
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return (aKey * (aKey + 3)) % KMaxEntries; |
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} |
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105 |
/** |
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Adds a new global variable to the WSD buffer and initializes a new entry in the hash table for the key. |
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@param aIdx The entry index in the hash table |
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@param aKey Global variable key |
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@param aLength Global variable data length in bytes |
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@panic SqliteMt 10 There is no space in the WSD buffer for the new variable |
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*/ |
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void Add(TInt aIdx, const TUint8* aKey, TInt aLength) |
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{ |
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__ASSERT_ALWAYS((iSize + aLength) <= KBufferSize, __SQLITEPANIC2(ESqliteOsPanicBufferSizeExceeded)); |
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//Add new entry to the hash table and the intial value to the WSD buffer |
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iTable[aIdx].iKey = aKey; |
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iTable[aIdx].iData = iNext; |
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iNext = Mem::Copy(iNext, aKey, aLength); |
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iSize += aLength; |
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//////////////// DEBUG prints ///////////////// |
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//for(TInt i=0;i<KMaxEntries;++i) |
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// { |
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// RDebug::Print(_L("%d %X %X %d\r\n"), i, (TUint)iTable[i].iKey, (TUint)iTable[i].iData, Hash((TUint)iTable[i].iKey)); |
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// } |
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} |
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126 |
|
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private: |
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TUint8 iBuffer[KBufferSize]; //WSD buffer |
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TUint8* iNext; //Points to the next entry in the buffer |
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TInt iSize; //Amount of buffer currently allocated in bytes |
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TPair iTable[KMaxEntries]; //Hash table matching the address of global varaibles to the address of the values in the WSD buffer |
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132 |
|
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133 |
}; |
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134 |
|
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135 |
/** |
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136 |
"Process local storage" structure, used for managing SQLite global variables. |
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137 |
|
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@see TStaticFs |
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@see TStaticMutex |
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@see TWsdMap |
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@see PlsInitialize |
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142 |
|
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@internalComponent |
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144 |
*/ |
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145 |
NONSHARABLE_STRUCT(TPls) |
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146 |
{ |
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TStaticFs iStaticFs; |
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TStaticMutex iStaticMutex[KStaticMutexCount]; |
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TWsdMap iWsdMap; |
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sqlite3_vfs iVfsApi; |
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151 |
}; |
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152 |
|
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153 |
/** |
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This is a callback function used by the Pls() call to get the process local storage initialized. |
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The function initializes the TPls data members. |
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156 |
|
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@param aPls A pointer to the process local storage. |
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@return KErrNone The process local storage has been successfully initialized. |
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159 |
|
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@panic SqliteMt 1 Failed to connect the RFs |
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@panic SqliteMt 2 Failed to create the static mutexes |
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@panic SqliteMt 4 Null aPls parameter value |
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163 |
|
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@internalComponent |
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*/ |
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static TInt PlsInitialize(TPls* aPls) |
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{ |
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SQLITE_TRACE_OS(OstTrace0(TRACE_INTERNALS, PLSINITIALIZE_ENTRY, "OS-Entry;0;PlsInitialize")); |
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__ASSERT_ALWAYS(aPls != NULL, __SQLITEPANIC2(ESqliteOsPanicNullPls1)); |
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//Global RFs object |
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TInt err = aPls->iStaticFs.Connect(); |
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SQLITE_TRACE_OS(OstTrace1(TRACE_INTERNALS, PLSINITIALIZE1, "OS;0;PlsInitialize;iStaticFs.Connect() err=%d", err)); |
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__ASSERT_ALWAYS(err == KErrNone, __SQLITEPANIC2(ESqliteOsPanicFsCreationError)); |
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//Static mutexes |
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TInt idx = 0; |
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for(;idx<(sizeof(aPls->iStaticMutex)/sizeof(aPls->iStaticMutex[0])) && err==KErrNone;++idx) |
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{ |
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err = aPls->iStaticMutex[idx].Create(); |
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} |
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SQLITE_TRACE_OS(OstTraceExt2(TRACE_INTERNALS, PLSINITIALIZE2, "OS;0;PlsInitialize;iStaticMutex[%d].Create() err=%d", idx, err)); |
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__ASSERT_ALWAYS(err == KErrNone , __SQLITEPANIC2(ESqliteOsPanicMutexCreationError)); |
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//WSD map |
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//...already initialized by its constructor |
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//sqlite3_vfs object |
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aPls->iVfsApi.iVersion = 1; |
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aPls->iVfsApi.szOsFile = sizeof(TDbFile); |
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aPls->iVfsApi.mxPathname = KMaxFileName; |
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aPls->iVfsApi.pNext = NULL; |
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aPls->iVfsApi.zName = "SymbianSqliteMt"; |
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aPls->iVfsApi.pAppData = NULL; |
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aPls->iVfsApi.xOpen = &TVfs::Open; |
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aPls->iVfsApi.xDelete = &TVfs::Delete; |
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aPls->iVfsApi.xAccess = &TVfs::Access; |
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aPls->iVfsApi.xFullPathname = &TVfs::FullPathName; |
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aPls->iVfsApi.xDlOpen = NULL; |
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aPls->iVfsApi.xDlError = NULL; |
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aPls->iVfsApi.xDlSym = NULL; |
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aPls->iVfsApi.xDlClose = NULL; |
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aPls->iVfsApi.xRandomness = &TVfs::Randomness; |
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aPls->iVfsApi.xSleep = &TVfs::Sleep; |
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aPls->iVfsApi.xCurrentTime = &TVfs::CurrentTime; |
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aPls->iVfsApi.xGetLastError = &TVfs::GetLastError; |
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SQLITE_TRACE_OS(OstTrace0(TRACE_INTERNALS, PLSINITIALIZE_EXIT, "OS-Exit;0;PlsInitialize")); |
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return KErrNone; |
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} |
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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////////////////////////// TStaticFs ///////////////////////////////////////////////////////////////////////////////////////// |
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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TStaticFs::TStaticFs() |
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{ |
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} |
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/** |
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Returns a reference to the already created RFs object that is located in the process local storage. |
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@return RFs reference |
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@panic SqliteMt 3 Invalid RFs handle |
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@panic SqliteMt 5 Process local storage initialization failure |
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*/ |
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RFs& TStaticFs::Fs() |
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{ |
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TPls* pls = ::Pls(KSqliteUid, &PlsInitialize); |
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__ASSERT_ALWAYS(pls != 0, __SQLITEPANIC2(ESqliteOsPanicNullPls2)); |
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__ASSERT_DEBUG(pls->iStaticFs.iFs.Handle() != KNullHandle, __SQLITEPANIC2(ESqliteOsPanicInvalidFs)); |
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return pls->iStaticFs.iFs; |
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} |
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|
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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////////////////////////// TStaticMutex ////////////////////////////////////////////////////////////////////////////////////// |
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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|
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TStaticMutex::TStaticMutex() |
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{ |
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} |
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|
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sqlite3_mutex* StaticMutex(TInt aType) |
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{ |
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TPls* pls = ::Pls(KSqliteUid, &PlsInitialize); |
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__ASSERT_ALWAYS(pls != 0, __SQLITEPANIC2(ESqliteOsPanicNullPls3)); |
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__ASSERT_ALWAYS((TUint)aType < (sizeof(pls->iStaticMutex)/sizeof(pls->iStaticMutex[0])), __SQLITEPANIC2(ESqliteOsPanicInvalidMutexType)); |
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return &pls->iStaticMutex[aType]; |
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} |
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|
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|
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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//////////////////////// sqlite3_wsd ///////////////////////////////////////////////////////////////////////////////////// |
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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|
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/** |
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The implementation of this function does not do anything special apart from checking that the requested WSD buffer size and |
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global variables count (WSD entries) are not bigger than the max TWsdMap buffer size and max TWsdMap entry count. |
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|
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@param aWsdBufSize SQLite expects the size of the WSD buffer to be "aWsdBufSize" bytes |
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@param aWsdEntryCount SQLite can place in the WSD buffer up to "aWsdEntryCount" global variables. |
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|
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@panic SqliteMt 12 The requested WSD buffer is too big. Bigger than TWsdMap::KBufferSize. |
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@panic SqliteMt 13 The requested global variables count is too big. Bigger than TWsdMap::KMaxEntries. |
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|
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@see TWsdMap |
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*/ |
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int sqlite3_wsd_init(int aWsdBufSize, int aWsdEntryCount) |
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{ |
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__ASSERT_ALWAYS(aWsdBufSize <= TWsdMap::KBufferSize, __SQLITEPANIC2(ESqliteOsPanicWsdBufSize)); |
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__ASSERT_ALWAYS(aWsdEntryCount <= TWsdMap::KMaxEntries, __SQLITEPANIC2(ESqliteOsPanicWsdEntryCount)); |
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return SQLITE_OK; |
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} |
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|
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/** |
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Performs a search in the WSD map (in the process local storage) for a global variable identified by the aKey parameter. |
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|
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@param aKey Global variable key |
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@param aLength Global variable data length in bytes |
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@return Pointer to the global variable data |
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|
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@panic SqliteMt 11 Process local storage initialization failure |
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@see TWsdMap |
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@see TPls |
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*/ |
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void* sqlite3_wsd_find(void* aKey, int aLength) |
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{ |
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__ASSERT_ALWAYS(aKey != NULL, __SQLITEPANIC2(ESqliteOsPanicNullKey)); |
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return ::Pls(KSqliteUid, &PlsInitialize)->iWsdMap.Find(static_cast <const TUint8*> (aKey), aLength); |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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////////////////////////// sqlite3_vfs /////////////////////////////////////////////////////////////////////////////////// |
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/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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sqlite3_vfs* VfsApi() |
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{ |
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TPls* pls = ::Pls(KSqliteUid, &PlsInitialize); |
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__ASSERT_ALWAYS(pls != 0, __SQLITEPANIC2(ESqliteOsPanicNullPls4)); |
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return &pls->iVfsApi; |
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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#endif SQLITE_OS_SYMBIAN |