1 | unit UCommDelay;
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2 |
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3 | {$mode Delphi}{$H+}
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4 |
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5 | interface
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6 |
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7 | uses
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8 | Classes, SysUtils, UCommPin, UThreading, SyncObjs, SpecializedList;
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9 |
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10 | type
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11 | TCommDelay = class;
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12 |
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13 | { TDelayedPacket }
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14 |
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15 | TDelayedPacket = class
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16 | ReceiveTime: TDateTime;
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17 | Data: TListByte;
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18 | constructor Create;
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19 | destructor Destroy; override;
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20 | end;
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21 |
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22 | { TCommDelayThread }
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23 |
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24 | TCommDelayThread = class(TTermThread)
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25 | Parent: TCommDelay;
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26 | PacketQueue: TListObject;
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27 | Pin: TCommPin;
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28 | Lock: TCriticalSection;
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29 | procedure Execute; override;
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30 | end;
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31 |
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32 | { TCommDelay }
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33 |
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34 | TCommDelay = class(TCommNode)
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35 | private
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36 | FDelay: TDateTime;
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37 | PacketQueue1: TListObject; // TListObject<TDelayedPacket>
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38 | PacketQueue2: TListObject; // TListObject<TDelayedPacket>
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39 | Thread1: TCommDelayThread;
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40 | Thread2: TCommDelayThread;
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41 | procedure ReceiveData1(Sender: TCommPin; AStream: TListByte);
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42 | procedure ReceiveData2(Sender: TCommPin; AStream: TListByte);
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43 | protected
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44 | procedure SetActive(const AValue: Boolean); override;
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45 | public
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46 | Lock1: TCriticalSection;
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47 | Lock2: TCriticalSection;
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48 | Pin1: TCommPin;
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49 | Pin2: TCommPin;
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50 | constructor Create(AOwner: TComponent); override;
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51 | destructor Destroy; override;
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52 | property Delay: TDateTime read FDelay write FDelay;
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53 | end;
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54 |
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55 | implementation
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56 |
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57 | { TCommDelayThread }
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58 |
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59 | procedure TCommDelayThread.Execute;
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60 | var
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61 | I: Integer;
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62 | CurrentTime: TDateTime;
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63 | SendData: TListByte;
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64 | DoSleep: Boolean;
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65 | begin
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66 | try
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67 | SendData := TListByte.Create;
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68 | repeat
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69 | DoSleep := True;
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70 | try
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71 | Lock.Acquire;
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72 | CurrentTime := Now;
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73 | I := 0;
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74 | while (I < PacketQueue.Count) do
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75 | if TDelayedPacket(PacketQueue[I]).ReceiveTime < (CurrentTime - Parent.Delay) then begin
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76 | DoSleep := False;
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77 | SendData.Assign(TDelayedPacket(PacketQueue[I]).Data);
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78 | PacketQueue.Delete(I);
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79 | try
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80 | Lock.Release;
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81 | Pin.Send(SendData);
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82 | finally
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83 | Lock.Acquire;
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84 | end;
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85 | end else Inc(I);
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86 | finally
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87 | Lock.Release;
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88 | end;
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89 | if not Terminated and DoSleep then Sleep(1);
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90 | until Terminated;
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91 | finally
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92 | SendData.Free;
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93 | end;
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94 | end;
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95 |
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96 | { TDelayedPacket }
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97 |
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98 | constructor TDelayedPacket.Create;
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99 | begin
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100 | Data := TListByte.Create;
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101 | end;
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102 |
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103 | destructor TDelayedPacket.Destroy;
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104 | begin
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105 | Data.Free;
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106 | inherited Destroy;
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107 | end;
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108 |
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109 | { TCommDelay }
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110 |
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111 | procedure TCommDelay.ReceiveData1(Sender: TCommPin; AStream: TListByte);
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112 | begin
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113 | try
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114 | Lock2.Acquire;
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115 | if Delay = 0 then Pin2.Send(AStream)
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116 | else
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117 | with TDelayedPacket(PacketQueue2.AddNew(TDelayedPacket.Create)) do begin
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118 | ReceiveTime := Now;
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119 | Data.Assign(AStream);
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120 | end;
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121 | finally
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122 | Lock2.Release;
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123 | end;
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124 | end;
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125 |
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126 | procedure TCommDelay.ReceiveData2(Sender: TCommPin; AStream: TListByte);
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127 | begin
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128 | try
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129 | Lock1.Acquire;
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130 | if Delay = 0 then Pin1.Send(AStream)
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131 | else
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132 | with TDelayedPacket(PacketQueue1.AddNew(TDelayedPacket.Create)) do begin
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133 | ReceiveTime := Now;
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134 | Data.Assign(AStream);
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135 | end;
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136 | finally
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137 | Lock1.Release;
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138 | end;
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139 | end;
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140 |
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141 | procedure TCommDelay.SetActive(const AValue: Boolean);
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142 | begin
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143 | if FActive = AValue then Exit;
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144 | FActive := AValue;
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145 | if AValue then begin
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146 | Thread1 := TCommDelayThread.Create(True);
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147 | Thread1.FreeOnTerminate := False;
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148 | Thread1.Parent := Self;
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149 | Thread1.Name := 'CommDelay1';
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150 | Thread1.PacketQueue := PacketQueue1;
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151 | Thread1.Pin := Pin1;
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152 | Thread1.Lock := Lock1;
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153 | Thread1.Start;
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154 |
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155 | Thread2 := TCommDelayThread.Create(True);
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156 | Thread2.FreeOnTerminate := False;
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157 | Thread2.Parent := Self;
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158 | Thread2.Name := 'CommDelay2';
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159 | Thread2.PacketQueue := PacketQueue2;
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160 | Thread2.Pin := Pin2;
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161 | Thread2.Lock := Lock2;
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162 | Thread2.Start;
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163 | end else begin
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164 | FreeAndNil(Thread1);
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165 | FreeAndNil(Thread2);
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166 | end;
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167 | inherited;
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168 | end;
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169 |
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170 | constructor TCommDelay.Create(AOwner: TComponent);
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171 | begin
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172 | inherited;
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173 | Lock1 := TCriticalSection.Create;
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174 | Lock2 := TCriticalSection.Create;
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175 | PacketQueue1 := TListObject.Create;
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176 | PacketQueue2 := TListObject.Create;
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177 | Pin1 := TCommPin.Create;
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178 | Pin1.OnReceive := ReceiveData1;
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179 | Pin1.Node := Self;
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180 | Pin2 := TCommPin.Create;
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181 | Pin2.OnReceive := ReceiveData2;
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182 | Pin2.Node := Self;
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183 | end;
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184 |
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185 | destructor TCommDelay.Destroy;
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186 | begin
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187 | Active := False;
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188 | Pin2.Free;
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189 | Pin1.Free;
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190 | PacketQueue1.Free;
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191 | PacketQueue2.Free;
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192 | Lock1.Free;
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193 | Lock2.Free;
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194 | inherited Destroy;
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195 | end;
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196 |
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197 | end.
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198 |
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