private static Dictionary <string, PackFile> ReuseMap(PackList old)
{
var forReuse = new Dictionary <string, PackFile>();
foreach (PackFile p in old.packs)
{
if (p.IsInvalid)
{
// The pack instance is corrupted, and cannot be safely used
// again. Do not include it in our reuse map.
//
p.Close();
continue;
}
PackFile prior = forReuse[p.File.Name] = p;
if (prior != null)
{
// This should never occur. It should be impossible for us
// to have two pack files with the same name, as all of them
// came out of the same directory. If it does, we promised to
// close any PackFiles we did not reuse, so close the one we
// just evicted out of the reuse map.
//
prior.Close();
}
}
return(forReuse);
}
private void RemovePack(PackFile deadPack)
{
PackList o, n;
do
{
o = _packList.get();
PackFile[] oldList = o.packs;
int j = indexOf(oldList, deadPack);
if (j < 0)
{
break;
}
var newList = new PackFile[oldList.Length - 1];
Array.Copy(oldList, 0, newList, 0, j);
Array.Copy(oldList, j + 1, newList, j, newList.Length - j);
n = new PackList(o.lastRead, o.lastModified, newList);
} while (!_packList.compareAndSet(o, n));
deadPack.Close();
}
