[wrathma]

is there any way to unpack two freearc archives in parallel using a installer. im using IsArcEx with this setup script.
lets say i have 4 archive and. the first one is the big one (10gb) which takes a lot of time to unpack and cpu has a little room to unpack other archives. archive 2-4 is light on cpu takes less than 2 mins to extract. so while archive 1 is unpacking i want to unpack archive 2-4 one by one in parallel with it. my current unpack implementation is here (i have very little knowledge on pascal it was mostly copied from IsArcEx example).

if ISArcDiskAddingSuccess and ISArcExInitEx(MainForm.Handle, 1, @ProgressCallback) then
    begin
      repeat
        ISArcExReduceCalcAccuracy(1);
        ISArcExChangeLanguage('English');
        for i := 1 to ISArcExDiskCount do
        begin
          ISArcExError := not ISArcExExtract(i, ExpandConstant('{tmp}\Arc.ini'), ExpandConstant('{app}'));
          if ISArcExError then break;
        end;
      until true;
      
      ISArcExStop;
    end

in my case the bigger files always go first, so ISArcExDiscCount 1 is always the big file. i want to keep it running on one thread and on another thread i want to run extraction of archive 2-4.