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1 // Copyright (c) 2006-2009 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 // Name : ewsd.cpp |
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15 // Part of : ewsd library |
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16 // Contains the definitions of the APIs of the emulator WSD library |
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17 // |
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18 |
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19 |
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20 |
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21 #ifdef __WINSCW__ |
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22 |
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23 #include <e32std.h> |
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24 #include <windows.h> |
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25 |
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26 // Constant declarations |
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27 const TInt KMaxNumberOfProcesses = 100; |
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28 const TInt KMaxNumberOfLibraries = 50; |
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29 |
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30 // Panic strings |
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31 _LIT(KMutexGetFailure, "WSD mutex get failed"); |
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32 _LIT(KMutexReleaseFailure, "WSD mutex release failed"); |
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33 |
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34 // Mutex name |
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35 unsigned short KMutexName[] = |
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36 { |
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37 'E', 'W', 'S', 'D', 'M', 'u', 't', 'e', 'x' |
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38 }; |
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39 |
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40 // LOCAL STRUCTURE DECLARATIONS |
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41 |
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42 // Data structure to store the WSD info associated with a particular DLL |
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43 struct TDllData |
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44 { |
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45 TUid iLibraryUid; |
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46 TAny* iPtr; |
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47 }; |
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48 |
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49 // Data structure to store the DLL information associated with a process |
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50 struct TWsdNode |
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51 { |
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52 TProcessId iPid; |
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53 TInt iFirstUnusedSlot; |
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54 struct TDllData iDllData[KMaxNumberOfLibraries]; |
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55 }; |
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56 |
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57 // WSD array variables |
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58 struct TWsdNode WsdArray[KMaxNumberOfProcesses]; |
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59 TInt LastUsedProcessSlot = -1; |
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60 |
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61 // LOCAL FUNCTION DECLARATIONS |
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62 |
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63 LOCAL_C TInt CleanupDeadProcessSlots(); |
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64 LOCAL_C void StorePls(const TInt& aProcessSlot, const TInt& aLibrarySlot, TAny* aPls, const TUid& aLibraryUid); |
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65 |
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66 // EXPORTED FUNCTION DEFINITIONS |
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67 |
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68 EXPORT_C TAny* CheckPls(const TUid& aLibraryUid) |
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69 { |
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70 TProcessId procId = RProcess().Id(); |
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71 |
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72 for (TInt i = 0; i <= LastUsedProcessSlot; ++i) |
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73 { |
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74 if (WsdArray[i].iPid == procId) |
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75 { |
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76 // This process has a slot in the WsdArray - now check |
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77 // whether its DLL array contains the specified library |
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78 TInt firstUnused = WsdArray[i].iFirstUnusedSlot; |
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79 for (TInt j = 0; j < firstUnused; ++j) |
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80 { |
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81 if (aLibraryUid == WsdArray[i].iDllData[j].iLibraryUid) |
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82 { |
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83 // The specified library is present so return the PLS object |
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84 return WsdArray[i].iDllData[j].iPtr; |
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85 } |
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86 } |
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87 break; |
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88 } |
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89 } |
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90 |
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91 // The PLS object hasn't yet been stored |
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92 return NULL; |
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93 } |
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94 |
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95 EXPORT_C TInt SetPls(TAny* aPls, const TUid& aLibraryUid) |
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96 { |
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97 TProcessId procId = RProcess().Id(); |
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98 TInt slot = -1; |
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99 |
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100 if (LastUsedProcessSlot >= 0) |
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101 { |
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102 for (TInt i = 0; i <= LastUsedProcessSlot; ++i) |
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103 { |
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104 if (!WsdArray[i].iPid.Id()) |
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105 { |
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106 if (slot == -1) |
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107 { |
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108 slot = i; |
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109 } |
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110 |
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111 continue; |
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112 } |
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113 else if (WsdArray[i].iPid == procId) |
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114 { |
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115 // We are about to set the Pls of a new library for this process |
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116 TInt firstUnused = WsdArray[i].iFirstUnusedSlot; |
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117 if (KMaxNumberOfLibraries == firstUnused) |
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118 { |
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119 // The library array is full for this process |
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120 return KErrNoMemory; |
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121 } |
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122 else |
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123 { |
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124 // Store the PLS for the specified library |
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125 StorePls(i, firstUnused, aPls, aLibraryUid); |
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126 return KErrNone; |
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127 } |
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128 } |
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129 } |
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130 |
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131 // The remainder of WsdArray is not used, so the process is |
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132 // not in it. If an empty slot hasn't yet been found then... |
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133 if (slot == -1) |
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134 { |
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135 // ... use the next unused slot in the array, if there is one |
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136 if (LastUsedProcessSlot < (KMaxNumberOfProcesses - 1)) |
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137 { |
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138 slot = LastUsedProcessSlot + 1; |
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139 } |
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140 else |
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141 { |
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142 // ... the array is full (there are no empty slots). |
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143 // Perform a clean up of the array to free any process slots that |
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144 // belong to dead processes to see if there is a slot that we can reuse |
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145 TInt slotToReuse = CleanupDeadProcessSlots(); |
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146 if (slotToReuse == -1) |
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147 { |
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148 // There are no reusable slots in the process array |
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149 return KErrNoMemory; |
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150 } |
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151 slot = slotToReuse; |
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152 } |
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153 } |
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154 } |
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155 else |
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156 { |
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157 slot = 0; |
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158 } |
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159 |
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160 // Store the PLS for the specified library |
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161 StorePls(slot, 0, aPls, aLibraryUid); |
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162 |
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163 // Store the process details too as this process is new to WsdArray |
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164 WsdArray[slot].iPid = procId; |
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165 |
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166 // Update the LastUsedProcessSlot if necessary |
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167 if (slot > LastUsedProcessSlot) |
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168 { |
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169 LastUsedProcessSlot = slot; |
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170 } |
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171 |
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172 return KErrNone; |
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173 } |
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174 |
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175 EXPORT_C TAny* AllocatePls(const TInt& aSize) |
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176 { |
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177 return VirtualAlloc(NULL, |
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178 aSize, |
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179 MEM_COMMIT | MEM_RESERVE, |
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180 PAGE_READWRITE); |
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181 } |
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182 |
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183 EXPORT_C TInt FreePls(TAny* aPls) |
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184 { |
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185 if (!VirtualFree(aPls, 0, MEM_RELEASE)) |
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186 { |
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187 return KErrAccessDenied; |
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188 } |
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189 aPls = NULL; |
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190 return KErrNone; |
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191 } |
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192 |
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193 EXPORT_C TAny* ObtainPlsMutex() |
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194 { |
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195 // Get a handle to the mutex (the mutex will be created |
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196 // if it doesn't already exist) and then wait to acquire |
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197 // ownership of the mutex |
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198 HANDLE mutexHandle = CreateMutex(NULL, FALSE, KMutexName); |
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199 if ((!mutexHandle) || (WaitForSingleObject(mutexHandle, INFINITE) == WAIT_FAILED)) |
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200 { |
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201 User::Panic(KMutexGetFailure, KErrAccessDenied); |
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202 } |
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203 |
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204 return mutexHandle; |
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205 } |
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206 |
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207 EXPORT_C void ReleasePlsMutex(TAny* aMutexHandle) |
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208 { |
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209 if (!ReleaseMutex(aMutexHandle)) |
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210 { |
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211 User::Panic(KMutexReleaseFailure, KErrAccessDenied); |
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212 } |
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213 } |
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214 |
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215 // LOCAL FUNCTIONS DEFINITIONS |
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216 |
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217 /** |
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218 Iterates through the WSD array and frees each slot that belongs to a dead process |
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219 (the stored data is reset and all associated PLS memory is freed). |
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220 Returns the index of the first freed slot if at least one slot was freed, |
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221 otherwise -1 |
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222 */ |
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223 LOCAL_C TInt CleanupDeadProcessSlots() |
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224 { |
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225 TInt firstReusableSlot = -1; |
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226 TUid nullUid = TUid::Null(); |
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227 LastUsedProcessSlot = -1; |
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228 RProcess proc; |
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229 for (TInt i = 0; i < KMaxNumberOfProcesses; ++i) |
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230 { |
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231 if(proc.Open(WsdArray[i].iPid) == KErrNone) |
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232 { |
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233 if(proc.ExitType()==EExitPending) |
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234 { |
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235 LastUsedProcessSlot = i; |
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236 proc.Close(); |
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237 continue; |
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238 } |
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239 else |
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240 proc.Close(); |
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241 |
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242 } |
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243 |
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244 // Process with the given name does not exist in |
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245 // the system, so the slot could be reused |
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246 WsdArray[i].iPid = 0; |
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247 |
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248 |
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249 // Free all of the PLS memory associated with this process |
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250 TInt firstUnused = WsdArray[i].iFirstUnusedSlot; |
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251 WsdArray[i].iFirstUnusedSlot = 0; |
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252 for (TInt j = 0; j < firstUnused; ++j) |
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253 { |
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254 FreePls(WsdArray[i].iDllData[j].iPtr); |
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255 WsdArray[i].iDllData[j].iLibraryUid = nullUid; |
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256 } |
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257 |
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258 if (firstReusableSlot == -1) |
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259 { |
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260 // Set the slot to reuse |
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261 firstReusableSlot = i; |
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262 } |
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263 } |
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264 |
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265 return firstReusableSlot; |
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266 } |
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267 |
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268 /** |
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269 Stores the specified PLS object and library TUid at the specified location in the WSD array. |
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270 Takes as parameters the process slot to use in the WSD array, the slot to use in the library |
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271 array associated with the given process, the PLS object to be stored and the TUid of the |
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272 library DLL that the PLS object belongs to |
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273 */ |
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274 LOCAL_C void StorePls(const TInt& aProcessSlot, const TInt& aLibrarySlot, TAny* aPls, const TUid& aLibraryUid) |
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275 { |
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276 WsdArray[aProcessSlot].iDllData[aLibrarySlot].iPtr = aPls; |
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277 WsdArray[aProcessSlot].iDllData[aLibrarySlot].iLibraryUid = aLibraryUid; |
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278 ++WsdArray[aProcessSlot].iFirstUnusedSlot; |
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279 } |
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280 |
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281 #endif // __WINSCW__ |