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1 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 #include "WsMemMgr.h" |
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17 #include "inifile.h" |
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18 #include "panics.h" |
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19 #include "wstop.h" |
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20 |
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21 CWsMemoryManager * CWsMemoryManager::iStatic = NULL; |
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22 |
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23 CWsMemoryManager * CWsMemoryManager::Static() |
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24 { |
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25 return iStatic; |
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26 } |
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27 |
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28 CWsMemoryManager * CWsMemoryManager::NewLC() |
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29 { |
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30 CWsMemoryManager * self = new (ELeave) CWsMemoryManager; |
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31 CleanupStack::PushL(self); |
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32 self->ConstructL(); |
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33 iStatic = self; |
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34 return iStatic; |
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35 } |
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36 |
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37 CWsMemoryManager::CWsMemoryManager() |
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38 { |
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39 iImpl = User::SwitchAllocator(this); |
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40 } |
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41 |
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42 CWsMemoryManager::~CWsMemoryManager() |
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43 { |
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44 WS_ASSERT_ALWAYS(this == User::SwitchAllocator(iImpl),EWsPanicMemoryManager); |
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45 iStatic = 0; |
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46 if (iReserve!=NULL) |
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47 { |
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48 Free(iReserve); |
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49 iReserve = NULL; |
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50 } |
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51 } |
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52 |
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53 void CWsMemoryManager::ConstructL() |
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54 { |
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55 _LIT(KMemMgrReserve, "MEMORYRESERVE"); |
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56 const TInt KDefaultMemMgrReserve = 1024; |
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57 |
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58 if (!WsIniFile->FindVar(KMemMgrReserve, iReserveSize)) |
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59 iReserveSize = KDefaultMemMgrReserve; |
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60 |
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61 if (iReserveSize > 0) |
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62 iReserve = Alloc(iReserveSize); |
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63 } |
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64 |
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65 /** |
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66 Implementing RAllocator |
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67 */ |
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68 |
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69 /** |
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70 Alloc and ReAlloc attempt to obtain memory through CWsTop::ReleaseMemory when they run low. |
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71 ReleaseMemory looks for blocks of memory that the window server doesn't need urgently and frees |
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72 them. |
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73 */ |
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74 TAny* CWsMemoryManager::Alloc(TInt aSize) |
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75 { |
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76 TBool keepTrying = ETrue; |
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77 do |
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78 { |
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79 if(iReleasing) |
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80 return iImpl->Alloc(aSize); //fallback on RAllocator |
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81 |
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82 if(TAny* ret = iImpl->Alloc(aSize)) //normal case |
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83 return ret; |
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84 |
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85 if(iReserveEnabled && iReserve && (aSize < iReserveSize)) |
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86 { |
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87 Free(iReserve); |
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88 iReserve = NULL; |
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89 } |
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90 else |
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91 { |
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92 iReleasing = ETrue; |
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93 keepTrying = CWsTop::ReleaseMemory(); |
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94 if(keepTrying) |
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95 { |
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96 const TInt reclaimed = Compress(); //Try to give back to the OS |
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97 } |
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98 iReleasing = EFalse; |
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99 } |
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100 |
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101 } while(keepTrying); |
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102 |
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103 return NULL; |
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104 } |
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105 |
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106 TAny* CWsMemoryManager::ReAlloc(TAny* aPtr, TInt aSize, TInt aMode) |
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107 { |
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108 TBool keepTrying = ETrue; |
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109 do |
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110 { |
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111 if(iReleasing) |
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112 return iImpl->ReAlloc(aPtr, aSize, aMode); //fallback on RAllocator |
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113 |
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114 if(TAny* ret = iImpl->ReAlloc(aPtr, aSize, aMode)) //normal case |
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115 return ret; |
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116 |
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117 if(iReserveEnabled && iReserve && (aSize < iReserveSize)) |
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118 { |
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119 Free(iReserve); |
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120 iReserve = NULL; |
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121 } |
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122 else |
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123 { |
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124 iReleasing = ETrue; |
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125 keepTrying = CWsTop::ReleaseMemory(); |
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126 if(keepTrying) |
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127 { |
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128 const TInt reclaimed = Compress(); //Try to give back to the OS |
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129 } |
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130 iReleasing = EFalse; |
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131 } |
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132 |
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133 } while(keepTrying); |
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134 |
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135 return NULL; |
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136 } |
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137 |
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138 /** |
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139 The rest of these functions just call the default implementation |
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140 */ |
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141 void CWsMemoryManager::Free(TAny* aPtr) |
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142 { |
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143 return iImpl->Free(aPtr); |
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144 } |
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145 |
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146 TInt CWsMemoryManager::AllocLen(const TAny* aCell) const |
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147 { |
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148 return iImpl->AllocLen(aCell); |
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149 } |
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150 |
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151 TInt CWsMemoryManager::Compress() |
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152 { |
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153 return iImpl->Compress(); |
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154 } |
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155 |
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156 void CWsMemoryManager::Reset() |
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157 { |
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158 iImpl->Reset(); |
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159 } |
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160 |
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161 TInt CWsMemoryManager::AllocSize(TInt& aTotalAllocSize) const |
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162 { |
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163 return iImpl->AllocSize(aTotalAllocSize); |
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164 } |
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165 |
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166 TInt CWsMemoryManager::Available(TInt& aBiggestBlock) const |
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167 { |
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168 return iImpl->Available(aBiggestBlock); |
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169 } |
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170 |
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171 TInt CWsMemoryManager::DebugFunction(TInt aFunc, TAny* a1, TAny* a2) |
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172 { |
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173 return iImpl->DebugFunction(aFunc,a1,a2); |
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174 } |
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175 |
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176 TInt CWsMemoryManager::Count() const |
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177 { |
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178 return iImpl->Count(); |
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179 } |
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180 /** This is a fairly dumb way to enable and disable the reserve, but we normally |
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181 get away with it because wserv is high priority. A better approach would be to |
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182 use placement new into the reserve memory and manage it directly. This would also |
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183 allow us to track misbehaving code which allocated during OOM drawing and didn't |
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184 free at the end. |
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185 */ |
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186 void CWsMemoryManager::EnableReserve() |
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187 { |
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188 WS_ASSERT_DEBUG(!iReserveEnabled, EWsPanicMemoryManager); |
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189 iReserveEnabled = ETrue; |
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190 } |
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191 |
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192 void CWsMemoryManager::DisableReserve() |
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193 { |
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194 WS_ASSERT_DEBUG(iReserveEnabled, EWsPanicMemoryManager); |
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195 iReserveEnabled = EFalse; |
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196 if((!iReserve) && (iReserveSize > 0)) |
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197 iReserve = Alloc(iReserveSize); |
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198 } |