vid System.IO.Ports.SerialStream.EventLoopRunner.WaitForCommEvent() vid System.Threading.ThreadHelper.ThreadStart_Context(Object state) vid System.Threading.ExecutionContext.runTryCode(Object userData) vid System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) vid System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) vid System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) vid System.Threading.ThreadHelper.ThreadStart()