Subj : Re: [.NET] Lock Object
To   : comp.programming.threads
From : Cool Guy
Date : Sat Sep 24 2005 03:43 pm

I wrote:

> Actually I should've mentioned that I had a Singleton with lazy
> instantiation in mind when I wrote that.

Here's the code:

sealed class LogFile
{
    #region Singleton functionality
    public static readonly LogFile Instance = new LogFile();

    static LogFile() {
    }
    #endregion

    StreamWriter streamWriter;
    readonly object streamWriterLock;

    LogFile() {
        streamWriterLock = new Object();
        FileStream fileStream = File.Open(...);
        lock (streamWriterLock) {  // lock for write memory barrier
                                   // (not sure whether this is needed)
            streamWriter = new StreamWriter(fileStream, Encoding.ASCII);
        }
    }

    public void AddEntry(string text) {
        lock (streamWriterLock) {
            streamWriter.WriteLine(text);
            streamWriter.Flush();
        }
    }
}

.