Lucene.Net.Index.IndexWriter.UpgradeReadToWrite C# (CSharp) Method

		internal virtual void  UpgradeReadToWrite()
		{
			lock (this)
			{
				System.Diagnostics.Debug.Assert(readCount > 0);
				upgradeCount++;
				while (readCount > upgradeCount || writeThread != null)
				{
					DoWait();
				}
				
				writeThread = ThreadClass.Current();
				readCount--;
				upgradeCount--;
			}
		}