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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / RunTime / DebugEngine / DebugControllerThread.cs / 1305376 / DebugControllerThread.cs
#region Using directives using System; using System.Threading; using System.Reflection; using System.Diagnostics; using System.Runtime.InteropServices; using System.Globalization; using Microsoft.Win32; #endregion namespace System.Workflow.Runtime.DebugEngine { internal sealed class DebugControllerThread { #region Data members private Thread controllerThread = null; private int threadId = 0; private ManualResetEvent threadInitializedEvent = null; private volatile bool runThread = false; private static readonly string ExpressionEvaluationFrameTypeName = "ExpressionEvaluationFrameTypeName"; #endregion #region Methods public DebugControllerThread() { this.threadInitializedEvent = new ManualResetEvent(false); this.threadInitializedEvent.Reset(); this.controllerThread = new Thread(ControllerThreadFunction); this.controllerThread.IsBackground = true; this.controllerThread.Priority = ThreadPriority.Lowest; this.controllerThread.Name = "__dct__"; } public void RunThread(IInstanceTable instanceTable) { Debug.WriteLine(string.Format(CultureInfo.CurrentCulture, "WDE: DebugControllerThread.DebugControllerThread():")); if (this.controllerThread == null) return; this.runThread = true; this.controllerThread.Start(instanceTable); this.threadInitializedEvent.WaitOne(); } public void StopThread() { Debug.WriteLine(string.Format(CultureInfo.CurrentCulture, "WDE: DebugControllerThread.StopThread():")); try { if (this.controllerThread != null) { this.runThread = false; Thread.Sleep(10); // On x64 we put the debug controller thread to Sleep(Timeout.Infinite) in // ExpressionEvaluationFunction. This thread needs to be started before it // a Join can execute. if (this.controllerThread.IsAlive && IntPtr.Size == 8) { while (this.controllerThread.ThreadState == System.Threading.ThreadState.WaitSleepJoin) { this.controllerThread.Start(); this.controllerThread.Join(); } } else this.controllerThread.Join(); } } catch (ThreadStateException) { // Ignore the ThreadStateException which will be thrown when StopThread() is called during // AppDomain unload. } finally { this.controllerThread = null; } this.controllerThread = null; this.threadId = 0; this.threadInitializedEvent = null; } private void ControllerThreadFunction(object instanceTable) { try { Debug.WriteLine(string.Format(CultureInfo.CurrentCulture, "WDE: DebugControllerThread.ControllerThreadFunction():")); IExpressionEvaluationFrame expressionEvaluationFrame = null; try { RegistryKey debugEngineSubKey = Registry.LocalMachine.OpenSubKey(RegistryKeys.DebuggerSubKey); if (debugEngineSubKey != null) { string evaluationFrameTypeName = debugEngineSubKey.GetValue(ExpressionEvaluationFrameTypeName, String.Empty) as string; if (!String.IsNullOrEmpty(evaluationFrameTypeName) && Type.GetType(evaluationFrameTypeName) != null) expressionEvaluationFrame = Activator.CreateInstance(Type.GetType(evaluationFrameTypeName)) as IExpressionEvaluationFrame; } } catch { } finally { if (expressionEvaluationFrame == null) expressionEvaluationFrame = Activator.CreateInstance(Type.GetType("Microsoft.Workflow.DebugEngine.ExpressionEvaluationFrame, Microsoft.Workflow.ExpressionEvaluation, Version=10.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35")) as IExpressionEvaluationFrame; } Debug.Assert(expressionEvaluationFrame != null, "Failed to create Expression Evaluation Frame."); if (expressionEvaluationFrame != null) expressionEvaluationFrame.CreateEvaluationFrame((IInstanceTable)instanceTable, (DebugEngineCallback)Delegate.CreateDelegate(typeof(DebugEngineCallback), this, "ExpressionEvaluationFunction")); } catch { // Don't throw exceptions to the Runtime, it would terminate the debugee. } } // This thread spins forever. It is used by the Debug Engine to perform expression evaluation as a "carrier // wave". It is created only when the debugger is attached and terminates itself when the debugger isn't // attached anymore. public void ExpressionEvaluationFunction() { this.threadId = NativeMethods.GetCurrentThreadId(); this.threadInitializedEvent.Set(); using (new DebuggerThreadMarker()) { // If an exception occurs somehow, continue to spin. while (this.runThread) { try { // Expression eval on x64 does not work (bug 18143) so // don't let the thread spin. if (IntPtr.Size == 8) { Thread.Sleep(Timeout.Infinite); } else // Spin within the try catch. while (this.runThread) ; } catch (ThreadAbortException) { Debug.WriteLine(string.Format(CultureInfo.CurrentCulture, "WDE: DebugControllerThread.ExpressionEvaluationFunction(): ThreadAbortException")); // Explicitly do not call ResetAbort(). throw; } catch { Debug.WriteLine(string.Format(CultureInfo.CurrentCulture, "WDE: DebugControllerThread.ExpressionEvaluationFunction(): other exception")); } } } } #endregion #region Properties public int ThreadId { get { return this.threadId; } } public int ManagedThreadId { get { return this.controllerThread.ManagedThreadId; } } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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