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#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 { }
if (expressionEvaluationFrame == null)
{
Type eeFrameType = null;
const string eeFrameTypeNameFormat = "Microsoft.Workflow.DebugEngine.ExpressionEvaluationFrame, Microsoft.Workflow.ExpressionEvaluation, Version={0}.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35";
// Try versions 12.0.0.0, 11.0.0.0, 10.0.0.0
for (int version = 12; eeFrameType == null && version >= 10; --version)
{
try
{
eeFrameType = Type.GetType(string.Format(CultureInfo.InvariantCulture, eeFrameTypeNameFormat, version));
}
catch (TypeLoadException)
{
// Fall back to next-lower version
}
}
if (eeFrameType != null)
{
expressionEvaluationFrame = Activator.CreateInstance(eeFrameType) 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
}
}
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