925 int AddrSpace::SC_Choose_Victim (int notMe) {
 926     TranslationEntry *entry = NULL;
 927     TranslationEntry *entry00 = NULL;
 928     TranslationEntry *entry01 = NULL;
 929     TranslationEntry *entry11 = NULL;
 930
 931     //variable for extra pass
 932     int pass = 0;
 933     unsigned int i = 0;
 934     while(pass < 2)
 935     {
 936         for(i = 0; i < numPages; i++)
 937         {
 938             entry = get_page_ptr(i);
 939
 940             //not valid, or a page to ignore
 941             if(!entry->valid || entry->physicalPage == (unsigned int)notMe)
 942             {
 943                 continue;
 944             }
 945
 946 /*            if(entry11 == NULL)
 947             {
 948                 entry11 = entry;
 949                 continue;
 950             }*/
 951
 952             //Second Chance
 953
 954             //found a 00 frame first pass
 955             //found a 10 frame second pass
 956             if((!entry->use) && (!entry->dirty))
 957             {
 958                 if(entry00 == NULL)
 959                 {
 960                     entry00 = entry;
 961                 }
 962                 //tie breaker by last time ran on CPU
 963                 else if(entry00->getTime() > entry->getTime())
 964                 {
 965                     entry00 = entry;
 966                 }
 967             }
 968             //ref bit is 1 in first pass, so reset and ignore
 969             //never true in second pass
 970             else if(entry->use)
 971             {
 972                 entry->clearSC();
 973             }
 974             //frame is 01 first pass
 975             //frame is 11 second pass
 976             else
 977             {
 978                 if(entry11 == NULL)
 979                 {
 980                     entry11 = entry;
 981                 }
 982                 else if(entry11->getTime() > entry->getTime())
 983                 {
 984                     entry11 = entry;
 985                 }
 986             }
 987
 988         }
 989         //we have a 00 (or 10 after second pass), so we're done
 990         if(entry00 != NULL)
 991         {
 992             return entry00->physicalPage;
 993         }
 994         else
 995         {
 996             if(pass == 0)
 997             {
 998                 //save 01 frames
 999                 //entry11 will track 11 frames on next pass
1000                 entry01 = entry11;
1001                 pass++;
1002             }
1003             else
1004             {
1005                 pass++;
1006             }
1007         }
1008     }
1009     //no 00 or 10 frames in list
1010
1011     //we have a 01 frame
1012     if(entry01 != NULL)
1013     {
1014         return entry01->physicalPage;
1015     }
1016     //otherwise return the 11 frame
1017     else
1018     {
1019         return entry11 == NULL ? 0 : entry11->physicalPage;
1020     }
1021 }