Proper handling waiting thread state in evaluation Fixes https://bugzilla.xamarin.com/show_bug.cgi?id=1637

Author: nerzhulart

Mono.Debugging.Soft/SoftEvaluationContext.cs

@@ -29,6 +29,7 @@
 using Mono.Debugger.Soft;
 using DC = Mono.Debugging.Client;
 using System.Runtime.CompilerServices;
+using System.Threading;
 
 namespace Mono.Debugging.Soft
 {
@@ -184,7 +185,11 @@ Value RuntimeInvoke (MethodMirror method, object target, Value[] values, bool en
 				return method.Evaluate (target is TypeMirror ? null : (Value) target, values);
 			} catch (NotSupportedException) {
 				AssertTargetInvokeAllowed ();
-
+				var threadState = Thread.ThreadState;
+				if (threadState == ThreadState.WaitSleepJoin) {
+					DC.DebuggerLoggingService.LogMessage ("Thread state before evaluation is {0}", threadState);
+					throw new EvaluatorException ("Evaluation is not allowed when the thread is in 'Wait' state");
+				}
 				var mc = new MethodCall (this, method, target, values, enableOutArgs);
 				//Since runtime is returning NOT_SUSPENDED error if two methods invokes are executed
 				//at same time we have to lock invoking to prevent this...