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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Activities.Debugger
{
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Diagnostics.SymbolStore;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime;
using System.Threading;
// Define an auxiliary thread codegen technique for islands.
// This executes the islands on a dedicated worker thread. The worker thread's
// physical callstack then maps to the interpreter's virtual callstack.
// It has an excellent Step-in/Step-over/Step-Out experience.
[DebuggerNonUserCode]
public class ThreadWorkerController
{
StateManager stateManager;
// Set to true to notify to Break on first instruction. This helps the F11 on startup experience.
// Since the islands are on a new thread, there may be no user code on the main thread and so
// F11 doesn't work. Thus the new worker thread needs to fire some break event.
// This gets reset after the 'startup breakpoint'.
// The initial Properties can override this.
bool breakOnStartup;
// Own the worker thread.
Thread worker;
// Signalled when the main thread wants to send an event to the worker thread.
// The main thread fills out the data first.
AutoResetEvent eventSend;
// Signalled by the worker thread when it's finished handling the event and
// the main thread can resume.
AutoResetEvent eventDone;
EventCode eventCode;
// Parameter for enter message.
VirtualStackFrame enterStackParameter;
internal void Initialize(string threadName, StateManager manager)
{
this.stateManager = manager;
this.breakOnStartup = this.stateManager.ManagerProperties.BreakOnStartup;
CreateWorkerThread(threadName);
}
internal void Exit()
{
// Implement with an unbalanced Leave.
// This will get the Worker to return and the ThreadProc to exit.
this.LeaveState();
this.worker.Join();
}
[DebuggerHidden]
void WorkerThreadProc()
{
Worker(false);
this.eventDone.Set();
}
// Private Entry point called from islands. Must be public so that the islands can invoke it.
[Fx.Tag.InheritThrows(From = "Worker")]
[DebuggerHidden]
public static void IslandWorker(ThreadWorkerController controller)
{
if (controller == null)
{
throw FxTrace.Exception.ArgumentNull("controller");
}
controller.Worker(true);
}
[DebuggerHidden]
internal void Worker(bool isAtStartup)
{
if (isAtStartup)
{
// Fire the 1-time "startup" breakpoint.
if (this.breakOnStartup)
{
if (Debugger.IsAttached)
{
Debugger.Break();
}
this.breakOnStartup = false;
}
this.eventDone.Set();
}
// The final terminator is when leave returns, but from a recursive call.
bool leave = false;
while (!leave)
{
this.eventSend.WaitOne();
switch (eventCode)
{
case EventCode.Enter:
// Call Island for enterStackParameter
this.stateManager.InvokeWorker(this, enterStackParameter);
// resume from SendLeave()
this.eventDone.Set();
break;
case EventCode.Leave:
leave = true;
return;
case EventCode.Break:
Debugger.Break();
this.eventDone.Set();
break;
}
}
}
void CreateWorkerThread(string threadName)
{
this.eventSend = new AutoResetEvent(false);
this.eventDone = new AutoResetEvent(false);
this.worker = new Thread(new ThreadStart(WorkerThreadProc));
string name = string.IsNullOrEmpty(threadName) ? this.stateManager.ManagerProperties.AuxiliaryThreadName : threadName;
if (name != null)
{
this.worker.Name = name;
}
this.worker.Start();
}
internal void EnterState(VirtualStackFrame newFrame)
{
this.eventCode = EventCode.Enter;
this.enterStackParameter = newFrame;
this.eventSend.Set();
// Block until Island executes Nop,
// giving BPs a chance to be hit.
// Must block here if the island is stopped at a breakpoint.
this.eventDone.WaitOne();
}
internal void LeaveState()
{
this.eventCode = EventCode.Leave;
this.eventSend.Set();
// Block until call has exited.
this.eventDone.WaitOne();
}
internal void Break()
{
this.eventCode = EventCode.Break;
this.eventSend.Set();
this.eventDone.WaitOne();
}
// Type of event being fired.
enum EventCode
{
Enter,
Leave,
Break
};
}
}
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