ForkJoinPool.drawio

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        <mxCell id="Oymi44IFPG7ip9I0upf_-1" value="&lt;h1 style=&quot;font-size: 16px;&quot;&gt;&lt;font style=&quot;font-size: 16px;&quot;&gt;ForkJoinPool 工作原理&lt;/font&gt;&lt;/h1&gt;&lt;p style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;源码不是很好理解，有很多反直觉的设计，一个字段可能拆分了好几块表示不同的含义，一些方法有很多循环、条件判断、位运算，堆在一起，很难推测作者的真实用意，需要结合上下文代码进行理解，最好是复制一份代码加上日志和断点进行调试。&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;&lt;b style=&quot;&quot;&gt;预备知识：&lt;/b&gt;&lt;br&gt;1）最好先对ThreadPoolExecutor有个清晰的认识，方便理解ForkJoinPool；&lt;br&gt;2）ThreadLocalRandom.getProbe() 探针；参考java-relearn 或 参考网文：&lt;a style=&quot;&quot; href=&quot;https://aobing.blog.csdn.net/article/details/115450889&quot;&gt;https://aobing.blog.csdn.net/article/details/115450889&lt;/a&gt;&lt;br&gt;3）理解“UNSAFE CAS 自旋”并发同步操作，以及UNSAFE修改对象的方法和Java对象的内存结构，代码里面有大量这种操作；&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;基于测试：&lt;br&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;java-async/async-future/ThreadExhaustionTest.java&lt;br&gt;&lt;/span&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;java-async/async-future/ArraySumMain.java&lt;/span&gt;&lt;/font&gt;&lt;/p&gt;" style="text;html=1;strokeColor=none;fillColor=none;spacing=5;spacingTop=-20;whiteSpace=wrap;overflow=hidden;rounded=0;" parent="1" vertex="1">
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        <mxCell id="a_vHJ03TcrBo9rNO5nsq-12" value="&lt;div style=&quot;font-size: 9px;&quot;&gt;线程池一共下面6种运行状态&lt;br style=&quot;&quot;&gt;&lt;div style=&quot;&quot;&gt;int&amp;nbsp; RSLOCK&amp;nbsp; &amp;nbsp; &amp;nbsp;= 1;&lt;/div&gt;&lt;div style=&quot;&quot;&gt;int&amp;nbsp; RSIGNAL&amp;nbsp; &amp;nbsp; = 1 &amp;lt;&amp;lt; 1;&lt;/div&gt;&lt;div style=&quot;&quot;&gt;int&amp;nbsp; STARTED&amp;nbsp; &amp;nbsp; = 1 &amp;lt;&amp;lt; 2;&lt;/div&gt;&lt;div style=&quot;&quot;&gt;int&amp;nbsp; STOP&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;= 1 &amp;lt;&amp;lt; 29;&lt;/div&gt;&lt;div style=&quot;&quot;&gt;int&amp;nbsp; TERMINATED = 1 &amp;lt;&amp;lt; 30;&lt;/div&gt;&lt;div style=&quot;&quot;&gt;int&amp;nbsp; SHUTDOWN&amp;nbsp; &amp;nbsp;= 1 &amp;lt;&amp;lt; 31; //-2147483648&lt;/div&gt;&lt;/div&gt;" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=middle;whiteSpace=wrap;rounded=0;fontSize=10;fontColor=#007FFF;" parent="1" vertex="1">
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        <mxCell id="X0HKkTIcBq6q-AQzs4eG-13" value="&lt;span style=&quot;font-size: 10px;&quot;&gt;&lt;b&gt;任务往队列插入元素流程&lt;/b&gt;：&lt;br&gt;通过&lt;b&gt;UNSAFE&lt;/b&gt;将&lt;b&gt;ForkJoinTask&lt;/b&gt;插入数组q.top位置，然后更新q.top的值（+1）&lt;br&gt;&lt;br&gt;因为是用的UNSAFE往数组插入的元素，UNSAFE是靠偏移量指针（byte为单位）修改的&lt;br style=&quot;&quot;&gt;根据JVM中对象内存结构，需要先计算出其&lt;b&gt;偏移位置&lt;/b&gt;是&lt;br style=&quot;&quot;&gt;markword (8) + 压缩类型指针(4) + 数组长度(4) + top * 指针类型(4)&lt;br style=&quot;&quot;&gt;里面最内部的按位与操作是为了防止索引溢出&lt;br style=&quot;font-size: 6px;&quot;&gt;&lt;/span&gt;" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;fontSize=6;fontColor=#3399FF;" parent="1" vertex="1">
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        <mxCell id="KyiJdkHfAW7Gcaq_ivn_-2" value="&lt;p style=&quot;margin: 4px 0px 0px; text-align: center;&quot;&gt;&lt;b&gt;ForkJoinPool&lt;/b&gt; extends AbstractExecutorService&lt;br style=&quot;font-size: 10px;&quot;&gt;&lt;/p&gt;&lt;hr style=&quot;font-size: 10px;&quot;&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//用于取ctl低16位，bit:0-15&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final int &lt;b&gt;SMASK&lt;/b&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; = 0xffff;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // short bits == max index&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final int MAX_CAP&amp;nbsp; &amp;nbsp; &amp;nbsp; = 0x7fff;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // max #workers - 1&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final int EVENMASK&amp;nbsp; &amp;nbsp; &amp;nbsp;= 0xfffe;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // even short bits&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final int SQMASK&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;= 0x007e;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // max 64 (even) slots&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;// Masks and units for WorkQueue.scanState and ctl sp subfield&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final int SCANNING&amp;nbsp; &amp;nbsp; &amp;nbsp;= 1;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// false when running tasks&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;// 非与工作者线程绑定的工作队列的初始状态，为负数，表示未激活状态&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final int INACTIVE&amp;nbsp; &amp;nbsp; &amp;nbsp;= 1 &amp;lt;&amp;lt; 31;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// must be negative&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final int SS_SEQ&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;= 1 &amp;lt;&amp;lt; 16;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&lt;font color=&quot;#007fff&quot;&gt;// 版本计数单元，SEQ和后面的UNIT含义一样，“+1”&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;// Mode bits for ForkJoinPool.config and WorkQueue.config&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//工作队列的工作模式&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final int MODE_MASK&amp;nbsp; &amp;nbsp; = 0xffff &amp;lt;&amp;lt; 16;&amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;// int 的高16位记录工作模式&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final int LIFO_QUEUE&amp;nbsp; &amp;nbsp;= 0;&lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;font color=&quot;#007fff&quot;&gt;//默认&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final int FIFO_QUEUE&amp;nbsp; &amp;nbsp;= 1 &amp;lt;&amp;lt; 16;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final int SHARED_QUEUE = 1 &amp;lt;&amp;lt; 31;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// must be negative&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;// static fields (initialized in static initializer below)&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;public static final ForkJoinWorkerThreadFactory defaultForkJoinWorkerThreadFactory;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final RuntimePermission modifyThreadPermission;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//默认实现&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final ForkJoinPool &lt;b&gt;common&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//common并行度，1~Max_CAP，默认为CPU核心数-1&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//可以通过系统属性“java.util.concurrent.ForkJoinPool.common.parallelism”设置&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;static final int &lt;b&gt;commonParallelism&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static int commonMaxSpares;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static int poolNumberSequence;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;// static configuration constants&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final long IDLE_TIMEOUT = 2000L * 1000L * 1000L; // 2sec&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final long TIMEOUT_SLOP = 20L * 1000L * 1000L;&amp;nbsp; // 20ms&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final int DEFAULT_COMMON_MAX_SPARES = 256;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final int SPINS&amp;nbsp; = 0;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final int SEED_INCREMENT = 0x9e3779b9;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;// Lower and upper word masks&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final long &lt;b&gt;SP_MASK&lt;/b&gt;&amp;nbsp; &amp;nbsp; = 0xffffffffL;&amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;//低32位掩码&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final long &lt;b&gt;UC_MASK&lt;/b&gt;&amp;nbsp; &amp;nbsp; = ~SP_MASK; &lt;font color=&quot;#007fff&quot;&gt;//高32位掩码 0xffffffff00000000L&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;// Active counts&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final int&amp;nbsp; &lt;b&gt;AC_SHIFT&lt;/b&gt;&amp;nbsp; &amp;nbsp;= 48;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final long AC_UNIT&amp;nbsp; &amp;nbsp; = 0x0001L &amp;lt;&amp;lt; AC_SHIFT; &lt;font color=&quot;#007fff&quot;&gt;//活跃线程数的计数单元,&quot;+1“操作&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final long AC_MASK&amp;nbsp; &amp;nbsp; = 0xffffL &amp;lt;&amp;lt; AC_SHIFT;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;// Total counts&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final int&amp;nbsp; &lt;b&gt;TC_SHIFT&lt;/b&gt;&amp;nbsp; &amp;nbsp;= 32;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final long TC_UNIT&amp;nbsp; &amp;nbsp; = 0x0001L &amp;lt;&amp;lt; TC_SHIFT;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final long TC_MASK&amp;nbsp; &amp;nbsp; = 0xffffL &amp;lt;&amp;lt; TC_SHIFT;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//ctl 中索引为47的bit,控制是否可以继续创建工作者线程&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final long &lt;b&gt;ADD_WORKER&lt;/b&gt; = 0x0001L &amp;lt;&amp;lt; (TC_SHIFT + 15); // sign&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;// runState bits: SHUTDOWN must be negative, others arbitrary powers of two&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final int&amp;nbsp; RSLOCK&amp;nbsp; &amp;nbsp; &amp;nbsp;= 1;&lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;font color=&quot;#007fff&quot;&gt;//索引为0的bit是加锁标志位&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final int&amp;nbsp; RSIGNAL&amp;nbsp; &amp;nbsp; = 1 &amp;lt;&amp;lt; 1;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final int&amp;nbsp; STARTED&amp;nbsp; &amp;nbsp; = 1 &amp;lt;&amp;lt; 2;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final int&amp;nbsp; STOP&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;= 1 &amp;lt;&amp;lt; 29;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final int&amp;nbsp; TERMINATED = 1 &amp;lt;&amp;lt; 30;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;private static final int&amp;nbsp; SHUTDOWN&amp;nbsp; &amp;nbsp;= 1 &amp;lt;&amp;lt; 31;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;// Instance fields&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//控制参数&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//&lt;/font&gt;&lt;font color=&quot;#007fff&quot;&gt;高32位的前16位：&lt;b&gt;AC，活跃线程数&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//高32位的后16位：&lt;b&gt;TC，工作线程数&lt;/b&gt;（其中最高位作为&lt;b&gt;是否可以新建线程&lt;/b&gt;的标志）&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//低32位的前16位：&lt;b&gt;SS，栈顶工作线程状态和版本数&lt;/b&gt;，第1位是线程状态：1:inactive, 0:active, 后15位表示版本号，防止ABA问题&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//低32位的后16位：&lt;b&gt;ID，栈顶工作线程所在工作队列的索引&lt;/b&gt;，配合WorkQueue.stackPred组成栈&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//即低32位记录空闲的栈顶工作线程信息，不为0即表示有空闲线程，每次提交任务如果不存在空闲的工作线程且ctl第47位不为0就会创建新线程执行提交的任务&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;volatile long &lt;b&gt;ctl&lt;/b&gt;;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// main pool control&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//线程池运行状态，初始为0&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;span style=&quot;color: rgb(0, 127, 255); background-color: initial;&quot;&gt;//第1位：运行状态锁标志位，防止其他线程并发修改运行状态，此bit为1则是加锁状态&lt;/span&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;volatile int &lt;b&gt;runState&lt;/b&gt;;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// lockable status&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//低16位表示并行度，高16位表示任务队列模式（默认LIFO_QUEUE）&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;final int &lt;b&gt;config&lt;/b&gt;;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // parallelism, mode&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;int indexSeed;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// to generate worker index&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//任务队列数组，即这里有多个队列&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;volatile WorkQueue[] &lt;b&gt;workQueues&lt;/b&gt;;&amp;nbsp; &amp;nbsp; &amp;nbsp;// main registry&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//工作者线程工厂&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;final ForkJoinWorkerThreadFactory &lt;b&gt;factory&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//未捕获异常处理器&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;final UncaughtExceptionHandler ueh;&amp;nbsp; 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26; // 64M&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//&amp;lt;0未激活，为奇数时表示处于扫描状态，为偶数时表示为繁忙（看源码应该是正在执行队列中的任务）&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//从源码可以看到&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//1) 创建线程时会注册新的工作队列，scanState&lt;/font&gt;&lt;span style=&quot;color: rgb(0, 127, 255); background-color: initial;&quot;&gt;记录此工作队列插入工作队列数组的索引，是奇数位置&lt;/span&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//2) 提交任务时，可能会创建工作队列并放在工作队列数组的偶数位置，且工作队列scanState初始为INACTIVE&lt;/font&gt;&amp;nbsp; &amp;nbsp;&amp;nbsp;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;volatile int &lt;b&gt;scanState&lt;/b&gt;;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;// &amp;lt;0: inactive; odd:scanning&amp;nbsp;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//前一个工作队列在工作队列数组中的索引，单数索引工作队列中包含绑定的工作线程，&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;通过这个字段将工作者线程连接起来，从访问方式上看其实是组成一个&lt;b&gt;栈&lt;/b&gt;的结构，栈顶在ForkJoinPool ctl ID段，&lt;/font&gt;&lt;span style=&quot;color: rgb(0, 127, 255); background-color: initial;&quot;&gt;唤醒工作者线程时总是从栈顶开始唤醒&lt;/span&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;每一个线程在挂起时都会持有前一个等待线程所在工作队列的索引，由此构成一个等待的工作线程栈，栈顶是最新的等待的线程&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;int &lt;b&gt;stackPred&lt;/b&gt;;&amp;nbsp; &amp;nbsp; &lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;// pool stack (ctl) predecessor&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//偷取的任务数量，任务偷取并不是将任务存到这个工作队列而是直接由工作者线程执行&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;int &lt;b&gt;nsteals&lt;/b&gt;;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// number of steals&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//随机数种子&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;int &lt;b&gt;hint&lt;/b&gt;;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;// randomization and stealer index hint&amp;nbsp;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//任务队列在队列数组中的索引以及队列模式（FIFO | FILO）&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//高16位是队列模式（&lt;b&gt;LIFO&lt;/b&gt;:0&amp;lt;&amp;lt;16 FIFO: 1&amp;lt;&amp;lt;16），低16位是最近插入工作队列数组的索引位置&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;int &lt;b&gt;config&lt;/b&gt;; &lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp; &amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//队列锁，控制多个线程往队列中同步地提交任务&lt;/font&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;volatile int &lt;b&gt;qlock&lt;/b&gt;;&lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;// 1: locked, &amp;lt; 0: terminate; else 0&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//poll操作（即取任务）的下个位置索引，初始是规定容量的一半，即4096&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;volatile int &lt;b&gt;base&lt;/b&gt;;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//push操作（即添加任务）的下个位置索引，初始是规定容量的一半，即4096&lt;/font&gt;&lt;br&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;int &lt;b&gt;top&lt;/b&gt;;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//任务数组，创建队列时，数组为null，首次提交任务时才实例化数组&lt;br&gt;&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;ForkJoinTask&amp;lt;?&amp;gt;[] &lt;b&gt;array&lt;/b&gt;; &lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;final ForkJoinPool &lt;b&gt;pool&lt;/b&gt;;&amp;nbsp; &amp;nbsp;&lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;// the containing pool (may be null)&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//创建工作者线程时创建的工作队列，会使用owner保存绑定的ForkJoinWorkerThread&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;final ForkJoinWorkerThread &lt;b&gt;owner&lt;/b&gt;; // owning thread or null if shared&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;volatile Thread &lt;b&gt;parker&lt;/b&gt;;&amp;nbsp; &amp;nbsp; &lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;// == owner during call to park; else null&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;volatile ForkJoinTask&amp;lt;?&amp;gt; &lt;b&gt;currentJoin&lt;/b&gt;;&lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;// task being joined in awaitJoin&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;//当前偷取的任务&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px;&quot;&gt;volatile ForkJoinTask&amp;lt;?&amp;gt; &lt;b&gt;currentSteal&lt;/b&gt;; &lt;span style=&quot;&quot;&gt;&lt;span style=&quot;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;// mainly used by helpStealer&amp;nbsp;&lt;/p&gt;&lt;hr style=&quot;font-size: 10px;&quot;&gt;&lt;p style=&quot;margin: 0px 0px 0px 4px; font-size: 10px;&quot;&gt;&lt;br&gt;&lt;/p&gt;" style="verticalAlign=top;align=left;overflow=fill;fontSize=10;fontFamily=Helvetica;html=1;whiteSpace=wrap;" parent="1" vertex="1">
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        <mxCell id="KyiJdkHfAW7Gcaq_ivn_-41" value="&lt;div style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;&lt;b style=&quot;&quot;&gt;RSLOCK锁的实现(lockRunState())&lt;/b&gt;&lt;b style=&quot;&quot;&gt;：&lt;/b&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;借助UNSAFE CAS 接口实现&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;加锁：判断runState锁标志位是否加锁（1加锁0未加锁），已经加锁就自旋等待其他线程释放锁，&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;未加锁则CAS修改标志位为1&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;解锁：CAS修改标志位为0&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;&lt;b&gt;计算工作队列个数算法&lt;/b&gt;：&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;int p = 8; //比如并行度设置为8&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;int n = (p &amp;gt; 1) ? p - 1 : 1;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;n |= n &amp;gt;&amp;gt;&amp;gt; 1; n |= n &amp;gt;&amp;gt;&amp;gt; 2;&amp;nbsp; n |= n &amp;gt;&amp;gt;&amp;gt; 4;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;n |= n &amp;gt;&amp;gt;&amp;gt; 8; n |= n &amp;gt;&amp;gt;&amp;gt; 16; n = (n + 1) &amp;lt;&amp;lt; 1;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 10px;&quot;&gt;&lt;font style=&quot;font-size: 10px;&quot;&gt;写个测试跑一下, 参考测试用例：testGenerateWorkQueueArraySize()，或者用1024画一画&lt;br&gt;会很明显地看出就是求&lt;b style=&quot;&quot;&gt;大于等于并行度&lt;/b&gt;&lt;b style=&quot;&quot;&gt;的最小2的指数幂的2倍&lt;/b&gt;, &lt;br&gt;比如： 大于等于6的2的指数幂最小是8, 再乘以2就是16&lt;/font&gt;&lt;/div&gt;" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;fontSize=8;fontColor=#3399FF;" parent="1" vertex="1">
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        <mxCell id="NMrCZGO8tHE7oQIJTHmH-8" value="&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;//通读这个方法的所有代码后可以知道，这个方法主要就是为了扫描工作队列数组获取一个待执行的ForkJoinTask任务&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;//w 是与工作者线程绑定的工作队列，r 是w插入工作队列数组时的随机数种子&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;private ForkJoinTask&amp;lt;?&amp;gt; scan(ForkJoinPool.WorkQueue w, int r) {&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; // m = ws.length-1 工作队列数组的长度是2次幂，m用于通过位运算实现取模运算&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; ForkJoinPool.WorkQueue[] ws; int m;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; // 可能包含待执行任务的前提条件，这个条件不满足说明整个工作队列数组中都没有待执行的任务，直接返回空&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; if ((ws = workQueues) != null &amp;amp;&amp;amp; (m = ws.length - 1) &amp;gt; 0 &amp;amp;&amp;amp; w != null) {&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // ss 初始值是w插入工作队列数组的索引, 是一个奇数，插入的第一个w scanState初始值为3&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; int ss = w.scanState;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&lt;br&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 结合后面 k = (k+1) &amp;amp; m, 用于实现如果ws[k]这个工作队列扫描不到待处理任务就遍历下一个工作队列&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;// origin：遍历工作队列数组的初始索引值&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // k: 每次循环的索引值&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // oldSum: 每遍历一圈更新一次，记录上次遍历一圈时的checkSum值&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // checkSum: 每遍历一圈重置一下，累计某圈遍历中每次循环q.base值（poll指针的值）&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&lt;b&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; for (int origin = r &amp;amp; m, k = origin, oldSum = 0, checkSum = 0;;) &lt;/b&gt;{&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; ForkJoinPool.WorkQueue q; ForkJoinTask&amp;lt;?&amp;gt;[] a; ForkJoinTask&amp;lt;?&amp;gt; t;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; int b, n; long c;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; //之前创建工作者线程的时候使用上面变量通过类似“开放地址法”的方法求过绑定的工作队列插入到工作队列数组的位置&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //这里其实是取模定位工作队列数组中的一个工作队列，获取的不一定是与当前工作者线程绑定的工作队列&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if ((q = ws[&lt;b&gt;k&lt;/b&gt;]) != null) {&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //q.base是poll指针用于取任务 q.top是push指针用于插入任务, 这里判断q中是否有待执行的任务&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if ((n = (b = q.base) - q.top) &amp;lt; 0 &amp;amp;&amp;amp;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; (a = q.array) != null) {&amp;nbsp; &amp;nbsp; &amp;nbsp;&lt;font color=&quot;#007fff&quot;&gt; // 有待执行的任务&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //b取模a.length获取工作队列数组读索引，然后转成内存的相对偏移i&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&lt;b&gt; long i = (((a.length - 1) &amp;amp; b) &amp;lt;&amp;lt; ASHIFT) + ABASE;&lt;/b&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //UNSAFE通过偏移量读取这个位置的任务&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if ((t = ((ForkJoinTask&amp;lt;?&amp;gt;)&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; U.getObjectVolatile(a, i))) != null &amp;amp;&amp;amp;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; q.base == b) {&amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;//q.base是volatile类型，比较一下防止这个任务已经被其他线程读取，其实相当于乐观锁&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //值不等的话说明从上次读取q.base到这次读取q.base之间有其他线程修改了q.base, 这种情况不执行这个任务&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (ss &amp;gt;= 0) {&amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;//判断与线程绑定的工作队列是否已经激活&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //先将任务从工作队列中移除，再唤醒工作者线程执行&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (U.compareAndSwapObject(a, i, t, null)) {&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; q.base = b + 1;&amp;nbsp; &amp;nbsp;&lt;font color=&quot;#007fff&quot;&gt;//更新q.base用于下次取临近的下一个任务&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (n &amp;lt; -1)&amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp;//n是poll push指针的差值，&amp;lt;-1 说明有多个待处理的任务，等于-1即只有一个待处理任务&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&lt;b&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //唤醒其他线程帮忙处理其他待执行的任务&lt;/b&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;b&gt;signalWork&lt;/b&gt;(ws, q);&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; return t;&amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp;&lt;b&gt;//当前线程只取q.base处的任务处理&lt;/b&gt;&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 与线程绑定的工作队列没有激活，上次checkSum为0且当前遍历的工作队列没有激活&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; else if (oldSum == 0 &amp;amp;&amp;amp;&amp;nbsp; &amp;nbsp;// try to activate&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; w.scanState &amp;lt; 0)&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;b&gt;tryRelease&lt;/b&gt;(c = ctl, ws[m &amp;amp; (int)c], AC_UNIT);&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&lt;br&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //下次循环准备&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (ss &amp;lt; 0)&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// refresh&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; ss = w.scanState;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //多次移位异或操作，计算下个散列值（称随机值有点不恰当）&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; r ^= r &amp;lt;&amp;lt; 1; r ^= r &amp;gt;&amp;gt;&amp;gt; 3; r ^= r &amp;lt;&amp;lt; 10;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; origin = k = r &amp;amp; m;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// move and rescan&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; oldSum = checkSum = 0;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; continue;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //走到这说明当前工作队列中没有待执行任务&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; checkSum += b;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; //下次循环准备（k = (k + 1) &amp;amp; m）以及循环退出条件&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //如果k位置的工作队列为空则k++，继续循环扫描下一个工作队列，直到工作不为空或者遍历了所有工作队列&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //这里如果相等说明已经遍历了所有工作队列&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if ((k = (k + 1) &amp;amp; m) == origin) {&amp;nbsp; &amp;nbsp; // continue until stable&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //遍历所有工作队列后的处理，不一定退出循环&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if ((ss &amp;gt;= 0 || (ss == (ss = w.scanState))) &amp;amp;&amp;amp;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; oldSum == (oldSum = checkSum)) {&amp;nbsp;&lt;font color=&quot;#007fff&quot;&gt; &amp;nbsp; //相等说明上一圈和这一圈所有工作队列poll指针都没有移动，即没有读取到可执行任务&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot; style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; //绑定的工作队列未激活或被锁定才退出循环&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (ss &amp;lt; 0 || w.qlock &amp;lt; 0)&amp;nbsp; &amp;nbsp; // already inactive&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;b&gt;break&lt;/b&gt;;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; int ns = ss | INACTIVE;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// try to inactivate&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; long nc = ((SP_MASK &amp;amp; ns) |&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; (UC_MASK &amp;amp; ((c = ctl) - AC_UNIT)));&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&amp;nbsp; &amp;nbsp; //&lt;br&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; w.stackPred = (int)c;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// hold prev stack top&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; U.putInt(w, QSCANSTATE, ns);&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (U.compareAndSwapLong(this, CTL, c, nc))&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; ss = ns;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; else&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; w.scanState = ss;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// back out&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; checkSum = 0;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; 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&amp;nbsp; // w.stackPred: 线程栈，前一个工作队列&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; for (int pred = w.stackPred, spins = SPINS, ss;;) {&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 如果工作队列的扫描状态大于等于0，表示有任务需要执行，跳出循环&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if ((ss = w.scanState) &amp;gt;= 0)&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; break;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 如果自旋次数大于0，则继续自旋&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; else if (spins &amp;gt; 0) {&amp;nbsp; &amp;nbsp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 随机数混淆自旋次数&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; r ^= r &amp;lt;&amp;lt; 6;&amp;nbsp;&lt;span style=&quot;background-color: initial;&quot;&gt;r ^= r &amp;gt;&amp;gt;&amp;gt; 21;&amp;nbsp;&lt;/span&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;r ^= r &amp;lt;&amp;lt; 7;&lt;/span&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 如果自旋次数用尽，随机查找其他工作队列&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (r &amp;gt;= 0 &amp;amp;&amp;amp; --spins == 0) {&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; WorkQueue v;&amp;nbsp;&lt;span style=&quot;background-color: initial;&quot;&gt;WorkQueue[] ws;&amp;nbsp;&lt;/span&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;int s, j;&amp;nbsp;&lt;/span&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;AtomicLong sc;&lt;/span&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 如果有前驱工作队列，且绑定的线程正在执行任务，则继续自旋&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (pred != 0 &amp;amp;&amp;amp; (ws = workQueues) != null &amp;amp;&amp;amp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; (j = pred &amp;amp; SMASK) &amp;lt; ws.length &amp;amp;&amp;amp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; (v = ws[j]) != null &amp;amp;&amp;amp;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&amp;nbsp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; (v.parker == null || v.scanState &amp;gt;= 0))&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; spins = SPINS;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&amp;nbsp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 如果工作队列已经处于终止状态，则返回false&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; else if (w.qlock &amp;lt; 0)&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; return false;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;br&gt;&lt;/div&gt;&lt;div style=&quot;&quot;&gt;&lt;font style=&quot;font-size: 9px;&quot; color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 如果当前线程&lt;/font&gt;&lt;font style=&quot;font-size: 9px;&quot; color=&quot;#007fff&quot;&gt;自旋次数用尽&lt;/font&gt;&lt;span style=&quot;color: rgb(0, 127, 255); background-color: initial;&quot;&gt;未被中断&lt;/span&gt;&lt;/div&gt;&lt;div style=&quot;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; else if (!Thread.interrupted()) {&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; long c, prevctl, parkTime, deadline;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; int ac = (int)((c = ctl) &amp;gt;&amp;gt; AC_SHIFT) + (config &amp;amp; SMASK);&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 如果活跃的工作线程数小于等于0，尝试&lt;b&gt;终止线程池&lt;/b&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if ((ac &amp;lt;= 0 &amp;amp;&amp;amp; tryTerminate(false, false)) ||&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; (runState &amp;amp; STOP) != 0)&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; return false;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 如果活跃的工作线程数小于等于0且当前工作队列是最后一个等待任务的队列&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (ac &amp;lt;= 0 &amp;amp;&amp;amp; ss == (int)c) {&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&amp;nbsp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 设置新的控制状态&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; prevctl = (UC_MASK &amp;amp; (c + AC_UNIT)) | (SP_MASK &amp;amp; pred);&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; int t = (short)(c &amp;gt;&amp;gt;&amp;gt; TC_SHIFT);&amp;nbsp;&amp;nbsp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 如果当前线程数量大于2，则缩小线程池容量&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (t &amp;gt; 2 &amp;amp;&amp;amp; U.compareAndSwapLong(this, CTL, c, prevctl))&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; return false;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 否则计算等待超时时间&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; parkTime = IDLE_TIMEOUT * ((t &amp;gt;= 0) ? 1 : 1 - t);&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; deadline = System.nanoTime() + parkTime - TIMEOUT_SLOP;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; else&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; prevctl = parkTime = deadline = 0L;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;br&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&amp;nbsp; &amp;nbsp; //后面代码主要用于让工作者线程进入等待&lt;br&gt;&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; Thread wt = Thread.currentThread();&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 模拟LockSupport的行为&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; U.putObject(wt, PARKBLOCKER, this);&amp;nbsp; &amp;nbsp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; w.parker = wt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 如果工作队列的扫描状态仍然小于0，并且控制状态没有发生变化，则进行等待&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (w.scanState &amp;lt; 0 &amp;amp;&amp;amp; ctl == c)&amp;nbsp; &amp;nbsp; &amp;nbsp;&amp;nbsp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; U.&lt;b&gt;park&lt;/b&gt;(false, parkTime);&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; U.putOrderedObject(w, QPARKER, null);&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; U.putObject(wt, PARKBLOCKER, null);&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;font color=&quot;#007fff&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 如果工作队列的扫描状态大于等于0，则表示有任务执行，跳出循环&lt;/font&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (w.scanState &amp;gt;= 0)&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; break;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (parkTime != 0L &amp;amp;&amp;amp; ctl == c &amp;amp;&amp;amp;&lt;/span&gt;&lt;br&gt;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; deadline - System.nanoTime() &amp;lt;= 0L &amp;amp;&amp;amp;&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; U.compareAndSwapLong(this, CTL, c, prevctl))&lt;/div&gt;&lt;div style=&quot;font-size: 9px;&quot;&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; return false;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; 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        <mxCell id="froqMD3xnD5BCt7UT14n-68" value="&lt;div&gt;&lt;div style=&quot;&quot;&gt;&lt;div style=&quot;&quot;&gt;&lt;div style=&quot;&quot;&gt;&lt;div&gt;&lt;span style=&quot;background-color: initial;&quot;&gt;private void &lt;b&gt;helpStealer&lt;/b&gt;(WorkQueue w, ForkJoinTask&amp;lt;?&amp;gt; task) { &lt;font color=&quot;#007fff&quot;&gt;//w：当前工作者线程绑定的工作队列，task：join的任务&lt;/font&gt;&lt;/span&gt;&lt;br&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; WorkQueue[] ws = workQueues; &lt;font color=&quot;#007fff&quot;&gt;// ws工作队列数组的引用&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; int oldSum = 0, checkSum, m;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; if (ws != null &amp;amp;&amp;amp; (&lt;b&gt;m&lt;/b&gt; = ws.length - 1) &amp;gt;= 0 &amp;amp;&amp;amp; w != null &amp;amp;&amp;amp;&amp;nbsp;&lt;span style=&quot;background-color: initial;&quot;&gt;task != null) {&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; do {&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; checkSum = 0;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;// 用于稳定性检查&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; ForkJoinTask&amp;lt;?&amp;gt; subtask;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; WorkQueue j = w, v;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;// v 是子任务窃取者&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;b&gt;descent: for (subtask = task; subtask.status &amp;gt;= 0; )&lt;/b&gt; { &lt;font color=&quot;#007fff&quot;&gt;// 从(j.hint|1)开始遍历奇数工作队列&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&lt;font color=&quot;#007fff&quot;&gt;&lt;b&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;//这个循环就是为了遍历工作队列找窃取者&lt;/b&gt;&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; for (int &lt;b&gt;h = j.hint | 1&lt;/b&gt;, k = 0, i; ; k += 2) {&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (k &amp;gt; m)&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&lt;font color=&quot;#007fff&quot;&gt;// 遍历完了都找不到窃取者&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; break descent;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if ((v = &lt;b&gt;ws[i = (h + k) &amp;amp; m]&lt;/b&gt;) != null) {&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (v.currentSteal == subtask) { &lt;font color=&quot;#007fff&quot;&gt;// 找到了窃取者&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&lt;b&gt; j.hint = i;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;font color=&quot;#007fff&quot;&gt;// hint记录窃取者的工作队列的索引&lt;/font&gt;&lt;/b&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; break;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; checkSum += v.base;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div&gt;&lt;b&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;font color=&quot;#007fff&quot;&gt;//走到这里说明找到了窃取者&lt;/font&gt;&lt;br&gt;&lt;/b&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; for (;;) {&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; ForkJoinTask&amp;lt;?&amp;gt;[] a; int b;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; checkSum += (b = v.base);&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; ForkJoinTask&amp;lt;?&amp;gt; &lt;b&gt;next&lt;/b&gt; = v.currentJoin;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (subtask.status &amp;lt; 0 || j.currentJoin != subtask ||&amp;nbsp;&lt;span style=&quot;background-color: initial;&quot;&gt;v.currentSteal != subtask) &lt;font color=&quot;#007fff&quot;&gt;// 当前线程join的任务已经执行完毕 或 当前线程绑定的工作队列join的任务不是subtask(什么情况下会变？) 或 窃取者的当前偷取的任务不是subtask&lt;/font&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; break descent;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (b - v.top &amp;gt;= 0 || (a = v.array) == null) { &lt;font color=&quot;#007fff&quot;&gt;// 窃取者没有待执行的任务&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if ((subtask = next) == null)&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;font color=&quot;#007fff&quot;&gt;//窃取者join的任务为空&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; break descent;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;b&gt;j = v&lt;/b&gt;;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&lt;font color=&quot;#007fff&quot;&gt;// 跳到外层循环&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; break;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div&gt;&lt;b&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&amp;nbsp; &amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;//获取窃取者base指针处的任务并执行&lt;/font&gt;&lt;br&gt;&lt;/b&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; int i = (((a.length - 1) &amp;amp; b) &amp;lt;&amp;lt; ASHIFT) + ABASE;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; ForkJoinTask&amp;lt;?&amp;gt; t = ((ForkJoinTask&amp;lt;?&amp;gt;)&amp;nbsp;&lt;span style=&quot;background-color: initial;&quot;&gt;U.getObjectVolatile(a, i));&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (v.base == b) {&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (t == null)&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; break descent;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (U.compareAndSwapObject(a, i, t, null)) {&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;font color=&quot;#007fff&quot;&gt;//将任务从窃取者的工作队列中删除&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; v.base = b + 1;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; ForkJoinTask&amp;lt;?&amp;gt; ps = w.currentSteal;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; int top = w.top;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; do {&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; U.&lt;b&gt;putOrderedObject&lt;/b&gt;(w, QCURRENTSTEAL, t);&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; t.&lt;b&gt;doExec&lt;/b&gt;();&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;b&gt;&lt;font color=&quot;#007fff&quot;&gt;// 执行从窃取者那里窃取的任务&lt;/font&gt;&lt;/b&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; } while (task.status &amp;gt;= 0 &amp;amp;&amp;amp;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; w.top != top &amp;amp;&amp;amp;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; (t = w.pop()) != null);&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;font color=&quot;#007fff&quot;&gt;//这里循环是顺便将当前线程绑定的工作队列中的任务执行一下，执行从窃取者那窃取的任务也可能会fork子任务提交到当前线程绑定的工作队列，所以要执行一下&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; U.putOrderedObject(w, QCURRENTSTEAL, ps);&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (w.base != w.top)&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; return;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // 不能进一步帮助&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div&gt;&lt;br&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; } while (task.status &amp;gt;= 0 &amp;amp;&amp;amp; oldSum != (oldSum = checkSum)); &lt;font color=&quot;#007fff&quot;&gt;// join的任务未完成且上次循环有找到窃取者工作队列中待处理的任务就继续循环&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div&gt;}&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;&lt;div style=&quot;&quot;&gt;&lt;/div&gt;" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=left;arcSize=1;" parent="1" vertex="1">
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        <mxCell id="froqMD3xnD5BCt7UT14n-72" value="&lt;div&gt;&lt;font color=&quot;#007fff&quot;&gt;//尝试缩减活动线程数量，可能释放或创建一个补偿线程&lt;/font&gt;&lt;/div&gt;&lt;div&gt;private boolean &lt;b&gt;tryCompensate&lt;/b&gt;(WorkQueue w) {&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; boolean canBlock;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; WorkQueue[] ws; long c; int m, pc, sp;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; if (w == null || w.qlock &amp;lt; 0 ||&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// caller terminating&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; (ws = workQueues) == null || (m = ws.length - 1) &amp;lt;= 0 ||&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; (pc = config &amp;amp; SMASK) == 0)&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;// parallelism disabled&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; canBlock = false;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; else if ((sp = (int)(c = ctl)) != 0)&amp;nbsp; &amp;nbsp; &amp;nbsp; &lt;font color=&quot;#007fff&quot;&gt;// 存在空闲的线程，释放空闲的线程&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; canBlock = &lt;b&gt;tryRelease&lt;/b&gt;(c, ws[sp &amp;amp; m], 0L);&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; else {&lt;/div&gt;&lt;div&gt;&lt;font color=&quot;#007fff&quot;&gt;&lt;span style=&quot;&quot;&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;//pc是并行度&lt;br&gt;&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; int &lt;b&gt;ac&lt;/b&gt; = (int)(c &amp;gt;&amp;gt; AC_SHIFT) + pc;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; int &lt;b&gt;tc&lt;/b&gt; = (short)(c &amp;gt;&amp;gt; TC_SHIFT) + pc; &lt;font color=&quot;#007fff&quot;&gt;&lt;b&gt;//TC段是“-并行度”,再+pc即实际已经创建的工作者线程数量&lt;/b&gt;&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; int &lt;b&gt;nbusy&lt;/b&gt; = 0;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // validate saturation&lt;/div&gt;&lt;div&gt;&lt;font color=&quot;#007fff&quot;&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;//遍历奇数索引的工作队列（即与线程绑定的工作队列），统计处于繁忙状态（即正在执行任务）的工作队列的数量&lt;br&gt;&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; for (int i = 0; i &amp;lt;= m; ++i) {&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; // two passes of odd indices&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; WorkQueue v;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if ((v = ws[((i &amp;lt;&amp;lt; 1) | 1) &amp;amp; m]) != null) {&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;font color=&quot;#007fff&quot;&gt;//只统计奇数索引的队列，每个统计两次&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if ((v.scanState &amp;amp; SCANNING) != 0)&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; break;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; ++nbusy;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;font color=&quot;#007fff&quot;&gt;//繁忙状态，统计+1&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;font color=&quot;#007fff&quot;&gt;//&lt;b&gt;如果 nbusy == tc&amp;lt;&amp;lt;1, 说明所有工作者线程都繁忙&lt;/b&gt;&lt;/font&gt;&lt;br&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (nbusy != (tc &amp;lt;&amp;lt; 1) || ctl != c)&lt;/div&gt;&lt;div&gt;&amp;nbsp; 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&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; canBlock = U.compareAndSwapLong(this, CTL, c, nc);&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; }&lt;/div&gt;&lt;div&gt;&lt;font color=&quot;#007fff&quot;&gt;&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;//超出最大线程数量&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; else if (tc &amp;gt;= MAX_CAP ||&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; (this == common &amp;amp;&amp;amp; tc &amp;gt;= pc + commonMaxSpares))&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; throw new RejectedExecutionException(&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &quot;Thread limit exceeded replacing blocked worker&quot;);&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; else {&lt;span style=&quot;white-space: pre;&quot;&gt;&#x9;&lt;/span&gt;&lt;font color=&quot;#007fff&quot;&gt;// similar to tryAddWorker，&lt;b&gt;突破并行度限制继续创建线程&lt;/b&gt;&lt;/font&gt;&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; boolean add = false; int rs;&amp;nbsp; &amp;nbsp; &amp;nbsp; // CAS within lock&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; long nc = ((AC_MASK &amp;amp; c) |&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; (TC_MASK &amp;amp; (c + TC_UNIT)));&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; if (((rs = lockRunState()) &amp;amp; STOP) == 0)&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; add = U.compareAndSwapLong(this, CTL, c, nc);&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; unlockRunState(rs, rs &amp;amp; ~RSLOCK);&lt;/div&gt;&lt;div&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; canBlock = add &amp;amp;&amp;amp; &lt;b&gt;createWorker&lt;/b&gt;(); 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