Question

assume I have a hosted wcf service in a console application like this:

public class MyService : IContract
{
  public static readonly object _locker_ = new object();

  public static void DoSomething()
  {
    lock (_locker_)
    {
      //block 1
      DoAnotherWork();
    }
  }

  void IContract.Foo1()
  {
    lock (_locker_)
    {
      //block 2
      DoSomeWork();
    }
  }

  void IContract.Foo2()
  {
    DoSomething();
  }
}

does this insures that only one client is in block 1? or block 2?

Answer 1

A static lock object is per-appdomain; so “block 1” and “block 2” only allow a single caller. Ultimately, yes. As long as you only have one appdomain ;p

Note that locks are re-entrant, so the thread with the lock can call the methods again without deadlocking itself (but not via WCF; only via regular C# method calling).