Mon, Aug 21 2006 11:20 AM
Marc Jacobi
Double check locking optimization
While I was looking for something completly different I stumbled upon the threading best practices on msdn(2).
http://msdn2.microsoft.com/en-us/library/1c9txz50.aspx
I noticed an optimization for the double check locking pattern that I use a lot. Instead of:
if (x == null)
{
lock (lockObject)
{
if (x == null)
{
x = y;
}
}
}
you can also write
System.Threading.Interlocked.CompareExchange(ref x, y, null);
It performs better but is a bit less readable (in my view).
One of those "nice to know"s.
Filed under: Code Design