Ricky:what the pro and cons on static method comparing to regular method in a multi-threaded environment?
I dont think there is a point in talking about methods being static or not, it is the data that is to be made threadsafe. Any data in a multi-threaded environment must be protected using various synchronization technique.
Static data is shared by all the instances of the class (or by calling programs if there are no instances) So, when there are a lot of instances of a class, static data it is more prone to corruption by multiple threads as compared to instance data.
Other than this there is no real difference in making a static/instance data threadsafe.