C# 並行編程 之 Barrier的使用 - 通過屏障同步併發任務

基本信息

Barrier 是 .Net 提供的一直併發的機制，它允許多個任務同步他們不同階段的併發工作。

這裏的關鍵點是【多個任務】和【不同階段】。 
假設有4個相同的任務(Task)，每個任務都有4個階段(Phase)，當他們併發工作時，只有當所有任務的相同步驟都完成時，所有任務纔可以開始下一個步驟。

如圖所示：

這裏的 Barrier 就是 .NetFramework 提供的一種機制。它像一個籬笆(屏障)，把所有任務的階段隔離開來，當前階段不完成，不會開始下一個階段。

代碼示例：

<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">using</span> System;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">using</span> System.Threading;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">using</span> System.Threading.Tasks;

namespace Sample5_1_barrier
{
    class Program
    {
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">Phase0Doing</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> TaskID)
        {
            Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task : #{0}   =====  Phase 0"</span>, TaskID);
        }

        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">Phase1Doing</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> TaskID)
        {
            Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task : #{0}   *****  Phase 1"</span>, TaskID);
        }

        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">Phase2Doing</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> TaskID)
        {
            Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task : #{0}   ^^^^^  Phase 2"</span>, TaskID);
        }

        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">Phase3Doing</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> TaskID)
        {
            Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task : #{0}   $$$$$  Phase 3"</span>, TaskID);
        }

        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> _TaskNum = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>;
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> Task[] _Tasks;
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> Barrier _Barrier;


        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> Main(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>[] args)
        {
            _Tasks = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Task[_TaskNum];
            _Barrier = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Barrier(_TaskNum, (barrier) =>
            {
                Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"-------------------------- Current Phase:{0} --------------------------"</span>, 
                                  _Barrier.CurrentPhaseNumber);
            });

            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> i = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; i < _TaskNum; i++)
            {
                _Tasks[i] = Task.Factory.StartNew((num) =>
                {
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> taskid = (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>)num;

                    Phase0Doing(taskid);
                    _Barrier.SignalAndWait();

                    Phase1Doing(taskid);
                    _Barrier.SignalAndWait();

                    Phase2Doing(taskid);
                    _Barrier.SignalAndWait();

                    Phase3Doing(taskid);
                    _Barrier.SignalAndWait();

                }, i);
            }

            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> finalTask = Task.Factory.ContinueWhenAll(_Tasks, (tasks) =>
                {
                    Task.WaitAll(_Tasks);
                    Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"========================================"</span>);
                    Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"All Phase is completed"</span>);

                    _Barrier.Dispose();
                });

            finalTask.Wait();

            Console.ReadLine();
        }
    }
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li><li style="box-sizing: border-box; padding: 0px 5px;">73</li><li style="box-sizing: border-box; padding: 0px 5px;">74</li><li style="box-sizing: border-box; padding: 0px 5px;">75</li><li style="box-sizing: border-box; padding: 0px 5px;">76</li><li style="box-sizing: border-box; padding: 0px 5px;">77</li><li style="box-sizing: border-box; padding: 0px 5px;">78</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li><li style="box-sizing: border-box; padding: 0px 5px;">73</li><li style="box-sizing: border-box; padding: 0px 5px;">74</li><li style="box-sizing: border-box; padding: 0px 5px;">75</li><li style="box-sizing: border-box; padding: 0px 5px;">76</li><li style="box-sizing: border-box; padding: 0px 5px;">77</li><li style="box-sizing: border-box; padding: 0px 5px;">78</li></ul>

測試結果： 

使用屏障時的異常處理

如果進入屏障後，工作的代碼出現了異常，這個異常會被包裝在BarrierPostPhaseException中，而且所有任務都能夠捕捉到這個異常。原始的異常可以通過NarrierPostPhaseException 對象的InnerException進行訪問。

代碼示例： 注意其中拋出異常的位置，和捕獲異常的位置。

<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">using</span> System;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">using</span> System.Threading;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">using</span> System.Threading.Tasks;

namespace Sample5_1_barrier
{
    class Program
    {
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">Phase0Doing</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> TaskID)
        {
            Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task : #{0}   =====  Phase 0"</span>, TaskID);
        }

        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">Phase1Doing</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> TaskID)
        {
            Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task : #{0}   *****  Phase 1"</span>, TaskID);

        }

        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">Phase2Doing</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> TaskID)
        {
            Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task : #{0}   ^^^^^  Phase 2"</span>, TaskID);
        }

        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">Phase3Doing</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> TaskID)
        {
            Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task : #{0}   $$$$$  Phase 3"</span>, TaskID);
        }

        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> _TaskNum = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>;
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> Task[] _Tasks;
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> Barrier _Barrier;


        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> Main(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>[] args)
        {
            _Tasks = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Task[_TaskNum];
            _Barrier = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Barrier(_TaskNum, (barrier) =>
            {
                Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"-------------------------- Current Phase:{0} --------------------------"</span>, 
                                  _Barrier.CurrentPhaseNumber);
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (_Barrier.CurrentPhaseNumber == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throw</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> InvalidOperationException(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Phase 2 need to be TERMINTED!!!!!"</span>);
            });

            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> i = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; i < _TaskNum; i++)
            {
                _Tasks[i] = Task.Factory.StartNew((num) =>
                {
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> taskid = (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>)num;

                    Phase0Doing(taskid);
                    _Barrier.SignalAndWait();

                    Phase1Doing(taskid);
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>
                    {
                        _Barrier.SignalAndWait();
                    }
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (BarrierPostPhaseException bpp_ex)
                    {
                        Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Got an Exception in Phase1: "</span> + bpp_ex.InnerException);
                    }

                    Phase2Doing(taskid);
                    _Barrier.SignalAndWait();

                    Phase3Doing(taskid);
                    _Barrier.SignalAndWait();

                }, i);
            }

            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> finalTask = Task.Factory.ContinueWhenAll(_Tasks, (tasks) =>
                {
                    Task.WaitAll(_Tasks);
                    Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"========================================"</span>);
                    Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"All Phase is completed"</span>);

                    _Barrier.Dispose();
                });

            finalTask.Wait();

            Console.ReadLine();
        }
    }
}
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li><li style="box-sizing: border-box; padding: 0px 5px;">73</li><li style="box-sizing: border-box; padding: 0px 5px;">74</li><li style="box-sizing: border-box; padding: 0px 5px;">75</li><li style="box-sizing: border-box; padding: 0px 5px;">76</li><li style="box-sizing: border-box; padding: 0px 5px;">77</li><li style="box-sizing: border-box; padding: 0px 5px;">78</li><li style="box-sizing: border-box; padding: 0px 5px;">79</li><li style="box-sizing: border-box; padding: 0px 5px;">80</li><li style="box-sizing: border-box; padding: 0px 5px;">81</li><li style="box-sizing: border-box; padding: 0px 5px;">82</li><li style="box-sizing: border-box; padding: 0px 5px;">83</li><li style="box-sizing: border-box; padding: 0px 5px;">84</li><li style="box-sizing: border-box; padding: 0px 5px;">85</li><li style="box-sizing: border-box; padding: 0px 5px;">86</li><li style="box-sizing: border-box; padding: 0px 5px;">87</li><li style="box-sizing: border-box; padding: 0px 5px;">88</li><li style="box-sizing: border-box; padding: 0px 5px;">89</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li><li style="box-sizing: border-box; padding: 0px 5px;">73</li><li style="box-sizing: border-box; padding: 0px 5px;">74</li><li style="box-sizing: border-box; padding: 0px 5px;">75</li><li style="box-sizing: border-box; padding: 0px 5px;">76</li><li style="box-sizing: border-box; padding: 0px 5px;">77</li><li style="box-sizing: border-box; padding: 0px 5px;">78</li><li style="box-sizing: border-box; padding: 0px 5px;">79</li><li style="box-sizing: border-box; padding: 0px 5px;">80</li><li style="box-sizing: border-box; padding: 0px 5px;">81</li><li style="box-sizing: border-box; padding: 0px 5px;">82</li><li style="box-sizing: border-box; padding: 0px 5px;">83</li><li style="box-sizing: border-box; padding: 0px 5px;">84</li><li style="box-sizing: border-box; padding: 0px 5px;">85</li><li style="box-sizing: border-box; padding: 0px 5px;">86</li><li style="box-sizing: border-box; padding: 0px 5px;">87</li><li style="box-sizing: border-box; padding: 0px 5px;">88</li><li style="box-sizing: border-box; padding: 0px 5px;">89</li></ul>

Barrier 關於超時的處理

這裏會使用Barrier.SignalAndWait(TIMEOUT))，來對超時進行判斷。示例代碼中Phase 2的Task 3會等待10秒，超過了超時時間 2秒，在Barrier中會檢查到Task的Phase2超時了並返回錯誤。

示例代碼：

<code class="hljs coffeescript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">using System;
using System.Threading;
using System.Threading.Tasks;


namespace Sample5_1_barrier
{
    <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Program</span></span>
    {

        private static <span class="hljs-reserved" style="box-sizing: border-box;">void</span> Phase0Doing(int TaskID)
        {
            Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task : <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">#{<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>}</span>   =====  Phase 0"</span>, TaskID);
        }

        private static <span class="hljs-reserved" style="box-sizing: border-box;">void</span> Phase1Doing(int TaskID)
        {
            Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task : <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">#{<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>}</span>   *****  Phase 1"</span>, TaskID);
        }

        private static <span class="hljs-reserved" style="box-sizing: border-box;">void</span> Phase2Doing(int TaskID)
        {
            int i = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;
            Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task : <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">#{<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>}</span>   ^^^^^  Phase 2"</span>, TaskID);
            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (TaskID == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>)
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">while</span> (i < <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>)
                {
                    System.Threading.Thread.Sleep(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1000</span>);
                    i++;
                }
        }

        private static <span class="hljs-reserved" style="box-sizing: border-box;">void</span> Phase3Doing(int TaskID)
        {
            Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task : <span class="hljs-subst" style="color: rgb(0, 0, 0); box-sizing: border-box;">#{<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>}</span>   $$$$$  Phase 3"</span>, TaskID);
        }

        private static int _TaskNum = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>;
        private static Task[] _Tasks;
        private static Barrier _Barrier;
        private static int TIMEOUT = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2000</span>;


        static <span class="hljs-reserved" style="box-sizing: border-box;">void</span> Main(string[] args)
        {
            <span class="hljs-reserved" style="box-sizing: border-box;">var</span> cts = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> System.Threading.CancellationTokenSource();
            <span class="hljs-reserved" style="box-sizing: border-box;">var</span> ct = cts.Token;

            _Tasks = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Task[_TaskNum];
            _Barrier = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Barrier<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(_TaskNum, (barrier) =>
            {
                Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"-------------------------- Current Phase:{0} --------------------------"</span>, 
                                  _Barrier.CurrentPhaseNumber);
                <span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">//i</span>f (_Barrier.CurrentPhaseNumber == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)
                <span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">//</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throw</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> InvalidOperationException(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Phase 2 need to be TERMINTED!!!!!"</span>);
            })</span>;

            <span class="hljs-title" style="box-sizing: border-box;">for</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(int i = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; i < _TaskNum; i++)</span>
            {
                <span class="hljs-title" style="box-sizing: border-box;">_Tasks</span>[<span class="hljs-title" style="box-sizing: border-box;">i</span>] = <span class="hljs-title" style="box-sizing: border-box;">Task</span>.<span class="hljs-title" style="box-sizing: border-box;">Factory</span>.<span class="hljs-title" style="box-sizing: border-box;">StartNew</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">((num) =>
                {
                    <span class="hljs-reserved" style="box-sizing: border-box;">var</span> taskid = (int)num;

                    Phase0Doing(taskid);
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!_Barrier.SignalAndWait(TIMEOUT))
                    {
                        Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"``````````````  This Phase {0} TIMEOUT  ``````````````"</span>, _Barrier.CurrentPhaseNumber);
                        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throw</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> OperationCanceledException(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Phase 0 canceled: "</span>, ct);
                    }

                    Phase1Doing(taskid);
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!_Barrier.SignalAndWait(TIMEOUT))
                    {
                        Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"``````````````  This Phase {0} TIMEOUT  ``````````````"</span>, _Barrier.CurrentPhaseNumber);
                        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throw</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> OperationCanceledException(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Phase 1 canceled: "</span>, ct);
                    }

                    Phase2Doing(taskid);
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!_Barrier.SignalAndWait(TIMEOUT))
                    {
                        Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"``````````````  This Phase {0} TIMEOUT  ``````````````"</span>, _Barrier.CurrentPhaseNumber);
                        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throw</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> OperationCanceledException(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Phase 2 canceled: "</span>, ct);
                    }

                    Phase3Doing(taskid);
                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!_Barrier.SignalAndWait(TIMEOUT))
                    {
                        Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"``````````````  This Phase {0} TIMEOUT  ``````````````"</span>, _Barrier.CurrentPhaseNumber);
                        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throw</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> OperationCanceledException(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Phase 3 canceled: "</span>, ct);
                    }

                }, i, ct)</span>;
            }

            <span class="hljs-title" style="box-sizing: border-box;">var</span> <span class="hljs-title" style="box-sizing: border-box;">finalTask</span> = <span class="hljs-title" style="box-sizing: border-box;">Task</span>.<span class="hljs-title" style="box-sizing: border-box;">Factory</span>.<span class="hljs-title" style="box-sizing: border-box;">ContinueWhenAll</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(_Tasks, (tasks) =>
                {
                    Task.WaitAll(_Tasks);
                    Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"========================================"</span>);
                    Console.WriteLine(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"All Phase is completed"</span>);
                }, ct)</span>;

            <span class="hljs-title" style="box-sizing: border-box;">try</span>
            {
                <span class="hljs-title" style="box-sizing: border-box;">finalTask</span>.<span class="hljs-title" style="box-sizing: border-box;">Wait</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>;
            }
            <span class="hljs-title" style="box-sizing: border-box;">catch</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(AggregateException aex)</span>
            {
                <span class="hljs-title" style="box-sizing: border-box;">Console</span>.<span class="hljs-title" style="box-sizing: border-box;">WriteLine</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Task failed And Canceled"</span> + aex.ToString())</span>;
            }
            <span class="hljs-title" style="box-sizing: border-box;">finally</span>
            {
                <span class="hljs-title" style="box-sizing: border-box;">_Barrier</span>.<span class="hljs-title" style="box-sizing: border-box;">Dispose</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>;
            }
            <span class="hljs-title" style="box-sizing: border-box;">Console</span>.<span class="hljs-title" style="box-sizing: border-box;">ReadLine</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>;
        }
    }
}</span></code>