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annotate TaskManager/Cell/spe/MemIterator.cc @ 2054:2e7a6f40672f draft

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add param(4) in FileMapReduce.cc
author masa
date Fri, 29 Jan 2016 15:56:28 +0900
parents 0094cd28bf41
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1476
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1 #include "MemIterator.h"
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2
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3 /*
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4 * Iterator は MemList にまとめる方がいいかも。
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5 *
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6 * @param [addr_list] main memory 側のアドレスリスト
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7 * @param [mem_list] memory segment のリスト
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8 * @param [cmd] Iterator パターンというべきか.
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9 *
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10 * cmd は、ms, MemList で情報を持っててもできる
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11 *
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12 */
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13
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14 MemIterator::MemIterator(AddrListPtr addr_list, MemList *mem_list,
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15 int cmd, SchedTask *smanager)
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16 {
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17
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18 this->addr_list = addr_list;
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19 this->mem_list = mem_list;
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20 this->smanager = smanager;
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21
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22 read_ms = NULL;
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23 exec_ms = NULL;
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24 write_ms = NULL;
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25 free_ms = NULL;
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26
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27 // コマンドは、ms 自体に持たせるべきなのかも知れない。
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28
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29 if (cmd == READ_WRITE) {
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30
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31 // 始め、必要になるであろう、データを load しておく
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32 read_ms = smanager->get_segment(addr_list->addr,mem_list);
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33 get_ms = &MemIterator::get_read_write_ms;
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34
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35 } else if (cmd == READ) {
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36
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37 // 始め、必要になるであろう、データを load しておく
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38 read_ms = smanager->get_segment(addr_list->addr,mem_list);
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39 get_ms = &MemIterator::get_read_ms;
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40
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41 } else if(cmd == WRITE) {
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42
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43 get_ms = &MemIterator::get_write_ms;
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44
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45 }
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46
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47
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48 }
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49
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50 /*
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51 * 次の ms があるか返す
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52 *
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53 * @retval 1 next がある
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54 * @retval 0 next がない
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55 */
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56 int
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57 MemIterator::hasNext(void)
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58 {
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59 return (addr_list->next) ? 1 : 0;
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60 }
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61
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62 /*
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63 * アドレスのリストから次に使う領域は予想できる
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64 * read, write する ms に使う。
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65 *
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66 * @return アドレスのリストに沿って、msに格納し返す
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67 */
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68 MemorySegmentPtr
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69 MemIterator::get_read_write_ms(void)
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70 {
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71
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72 // main memory に書き出し
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73 smanager->put_segment(write_ms);
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74
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75 /*
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76 * 前回の put segment を待つ
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77 * ms はメモリ領域を使い回しているので、free 部分も dma 完了を待つ
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78 */
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79 smanager->wait_segment(free_ms);
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80
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81 // stage 遷移
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82 free_ms = write_ms;
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83 write_ms = exec_ms;
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84 exec_ms = read_ms;
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85
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86 // アドレスをリストから追っていく
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87 addr_list = addr_list->next;
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88
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89 // 次必要なものを load し始めておく
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90 read_ms = smanager->get_segment(addr_list->addr, mem_list);
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91
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92
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93 // 前回の get segment を待つ
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94 smanager->wait_segment(exec_ms);
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95
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96 return exec_ms;
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97 }
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98
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99 /*
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100 * read only な ms に使う
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101 *
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102 * @return アドレスのリストに沿って、msに格納し返す
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103 */
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104 MemorySegmentPtr
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105 MemIterator::get_read_ms(void)
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106 {
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107
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108 // stage 遷移
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109 exec_ms = read_ms;
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110
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111 // アドレスをリストから追っていく
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112 addr_list = addr_list->next;
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113
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114
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115 // 次必要なものを load し始めておく
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116 read_ms = smanager->get_segment(addr_list->addr,mem_list);
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117
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118 // 前回の get segment を待つ
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119 smanager->wait_segment(exec_ms);
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120
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121 return exec_ms;
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122 }
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123
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124 /*
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125 * アドレスのリストから次に使う領域は予想できる
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126 * write only な ms に使うパターン
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127 *
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128 * @return free な ms 領域を返す
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129 */
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130 MemorySegmentPtr
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131 MemIterator::get_write_ms(void)
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132 {
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133
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134 /*
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135 * 前回の put segment を待つ.
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136 * ms はメモリ領域を使い回しているので、free 部分も dma 完了を待つ.
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137 * 書き出しのタイミングは memory segment の数による
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138 * ので、最適な書き込み完了待ちはできない.
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139 * MemList 側に書けば、できるはず.
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140 */
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141 smanager->wait_segment(free_ms);
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142
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143 // stage 遷移
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144 free_ms = write_ms;
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145
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146 // 書きこみ開始。次 get_write_ms が呼ばれる時に wait する。
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147 smanager->put_segment(free_ms);
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148
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149 // free な領域を取得する。dma load する必要はない。
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150 write_ms = smanager->get_free_segment(addr_list->addr, mem_list);
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151
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152 // アドレスをリストから追っていく
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153 addr_list = addr_list->next;
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154
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155 return write_ms;
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156 }
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157
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158
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159 /*
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160 * 出しておいた segment 命令を待つ.
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161 * まだ、書きこまれていないmsを書きこむ
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162 * 最後の締め.
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163 */
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164
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165 void
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166 MemIterator::collect_ms(void)
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167 {
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168 smanager->put_segment(write_ms);
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169 smanager->wait_segment(free_ms);
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170 smanager->wait_segment(write_ms);
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171 smanager->wait_segment(read_ms);
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172 }
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173
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174
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175 /*
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176 * 走査中のlistの一部を上書きする.
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177 * mainMem (CreateSpan) とかやるとき、使う予定
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178 */
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179 void
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180 MemIterator::overwrite_list(AddrListPtr list)
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181 {
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182
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183 /*
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184 * すでに次のリストの read を開始している可能性がある
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185 * ので、それをいったん中止、同じ ms に 新しく load をかける。
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186 *
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187 * でも、これは write only な場合いらない..
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188 */
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189
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190 // dma命令キャンセルする方法があるかな. 調べてみる. あるならwaitするよりそっちがいい.
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191 smanager->wait_segment(read_ms);
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192
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193 /* segment に直接上書きする機能が必要かも. 要実装.
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194 * 指定した ms に load する
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195 * この場合は、read_ms に新しく list->addr を load する
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196 */
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197 smanager->overwrite_segment(read_ms, list->addr);
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198
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199
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200 /*
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201 * 現在のaddr_list を新しい list に上書きする
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202 */
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203 AddrListPtr tmp = list;
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204
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205 while(list->next) {
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206 list = list->next;
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207 }
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208
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209 list->next = addr_list->next;
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210 addr_list = tmp;
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211
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212 }
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213
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214