Question

In Java you can wait on every object, so this kind of scenario is possible to program:

Thread A waits on object a

Thread B waits on object b

Thread C notifys on a

Thread A notifys on b

if i use C#’s Monitor, it seems to me that Thread C could only wake b up (or b and a), then how do i make such a scenario possible?

Answer 1

You seem to be thinking that because the C# synchronization functions are members of the Monitor class, that you need a special Monitor instance to use them, in contrast to Java where they are members of the java.lang.Object class and available for all objects.

Quite the opposite. There are no Monitor instances at all. In C#, the functions are static methods, and still work on any object. The only reason for the Monitor class is to prevent System.Object from being cluttered with extra members (which would show up in Intellisense suggestion lists, etc).

However, I find that code using Pulse usually has hidden race conditions. There are better ways to synchronize between threads that make writing reliable code easier.