internal bool Lock(Table obj)
{
if (obj.RowNo == 0)
{
throw new System.InvalidOperationException("MinBase: Attempt to lock an object which hasn't been loaded from file " + File.LoFile.Name + ".");
}
SyncWrite.WaitOne();
RowLock lk;
while (true)
{
if (!LockList.TryGetValue(obj.RowNo, out lk))
{
break;
}
bool rv = lk.Lock();
SyncWrite.ReleaseMutex();
if (rv)
{
return(true);
}
System.Threading.Thread.Sleep(0);
SyncWrite.WaitOne();
}
lk = new RowLock();
File.Lock(obj);
LockList.Add(obj.RowNo, lk);
Read(obj, obj.RowNo);
SyncWrite.ReleaseMutex();
return(true);
}
public Index(string nm, ushort kl, DateTime udTime)
{
int sz = DataFile.GetSize(Root);
if (DataFile.Exists(nm, "Index"))
{
File = DataFile.Open(nm, "Index", FileMode.Open);
File.Read(Root, DataFile.coSignatureSz, sz);
if (DateTime.Compare(Root.LastUpdate, udTime) >= 0 && Root.Closed)
{
Root.Closed = false;
File.Lock(Root);
File.Write(Root);
return;
}
File.Close();
DataFile.Delete(nm, "Index");
}
File = DataFile.Open(nm, "Index", FileMode.CreateNew);
DataFile.Blank(Root, sz);
Root.KeyLength = kl;
Root.Closed = false;
Root.PageSize = (ushort)DataFile.GetSize(new IdxPage(0, 0, 0, kl));
File.Append(Root, sz);
File.Lock(Root);
}