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1 using Implab.Parallels;
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2 using System;
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3 using System.Collections.Generic;
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4 using System.Linq;
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5 using System.Text;
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6 using System.Threading;
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7 using System.Threading.Tasks;
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8 using System.Windows.Forms;
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9
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10 namespace Implab.Diagnostics.Interactive
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11 {
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12 public class InteractiveListener: Disposable
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13 {
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14 TraceForm m_form;
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15
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16 SynchronizationContext m_syncGuiThread;
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17
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18 readonly IPromiseBase m_guiFinished;
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19 readonly Promise<object> m_guiStarted = new Promise<object>();
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20
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21 readonly IPromiseBase m_workerFinished = new Promise<object>();
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22
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23 readonly MTQueue<TraceViewItem> m_queue = new MTQueue<TraceViewItem>();
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24 readonly AutoResetEvent m_queueEvent = new AutoResetEvent(false);
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25
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26 int m_queueLength;
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27 bool m_exitPending;
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28
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29 readonly object m_pauseLock = new object();
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30 bool m_paused;
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31 readonly ManualResetEvent m_pauseEvent = new ManualResetEvent(true);
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32
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33 public InteractiveListener() {
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34 m_guiFinished = AsyncPool.InvokeNewThread(() => {
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35 GuiThread();
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36 return 0;
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37 });
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38
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39 m_guiStarted.Join();
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40 }
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41
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42 void GuiThread() {
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43 m_form = new TraceForm(); // will create SynchronizationContext
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44 m_syncGuiThread = SynchronizationContext.Current;
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45 m_guiStarted.Resolve();
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46 Application.Run();
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47 }
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48
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49 void QueueThread() {
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50 while (!m_exitPending) {
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51 if (m_paused)
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52 m_pauseEvent.WaitOne();
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53
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54 TraceViewItem item;
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55 if (m_queue.TryDequeue(out item)) {
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56 Interlocked.Decrement(ref m_queueLength);
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57
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58 m_syncGuiThread.Send(x => m_form.AddTraceEvent(item),null);
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59 } else {
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60 m_queueEvent.WaitOne();
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61 }
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62 }
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63 }
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64
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65 public void Pause() {
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66 // for consistency we need to set this properties atomically
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67 lock (m_pauseLock) {
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68 m_pauseEvent.Reset();
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69 m_paused = true;
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70 }
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71 }
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72
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73 public void Resume() {
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74 // for consistency we need to set this properties atomically
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75 lock (m_pauseLock) {
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76 m_paused = false;
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77 m_pauseEvent.Set();
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78 }
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79 }
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80
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81 void Enqueue(TraceViewItem item) {
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82 m_queue.Enqueue(item);
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83 if (Interlocked.Increment(ref m_queueLength) == 1)
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84 m_queueEvent.Set();
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85 }
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86
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87 public void ShowForm() {
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88 m_syncGuiThread.Post(x => m_form.Show(), null);
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89 }
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90
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91 public void HideForm() {
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92 m_syncGuiThread.Post(x => m_form.Hide(), null);
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93 }
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94
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95 void Terminate() {
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96 m_syncGuiThread.Post(x => Application.ExitThread(), null);
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97 }
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98
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99 protected override void Dispose(bool disposing) {
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100 if (disposing) {
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101 Terminate();
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102 m_guiFinished.Join();
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103 }
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104 base.Dispose(disposing);
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105 }
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106 }
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107 }
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