Mono.Debugger.Process.StartOperation C# (CSharp) Method

        internal CommandResult StartOperation(ThreadingModel model, SingleSteppingEngine caller)
        {
            if (!ThreadManager.InBackgroundThread)
                throw new InternalError ();

            if ((current_state != ProcessState.Stopped) && (current_state != ProcessState.SingleThreaded))
                throw new TargetException (TargetError.NotStopped);

            if ((model & ThreadingModel.ThreadingMode) == ThreadingModel.Single) {
                current_state = ProcessState.SingleThreaded;
                if ((model & ThreadingModel.ResumeThreads) != 0)
                    ResumeUserThreads (model, caller);
                return new ThreadCommandResult (caller.Thread);
            } else if ((model & ThreadingModel.ThreadingMode) != ThreadingModel.Process) {
                throw new ArgumentException ();
            }

            lock (this) {
                current_state = ProcessState.Running;
                stopped_event.Reset ();
                current_operation = new ProcessCommandResult (this, model);
            }

            ResumeUserThreads (model, caller);
            return current_operation;
        }