How can I set a min value in .Net without using a lock?

Question

I have multiple threads accessing variables. I know how to write spinlocks and use the Threading.Interlocked methods to increment etc. variables.

However, I want to

Answer 1

If you don't anticipate a great deal of contention then perhaps something like this? (If there's likely to be a lot of contention then a plain lock might well be more efficient.)

int original;    // assuming here that a is an int
do
{
    original = a;
} while (Interlocked.CompareExchange(ref a, original | 10, original) != original)