MultiThreadingStudy/Docs/Jupyter笔记.2.4.线程本地存储.ipynb

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    "线程本地存储\n",
    "============================== "
   ]
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   "source": [
    "线程本地存储(Thread Local Storge,简称TLS)机制用于实现按线程隔离的线程本地变量，对于同一个线程本地变量，各个线程分别有独立的值，修改的值只能修改的线程可见。  <br/>\n",
    "\n",
    "线程要地存储可以分为原生实现与托管实现，原生实现指的是调用操作系统提供的接口访问原生线程对应的线程本地存储，而托管实现指的是调用.net提供的接口访问托管线程对应的线程本地存储。  <br/>\n",
    "\n",
    "原生实现，在Windows和linux上的实现不同，但同样都是调用系统提供的接口。  <br/>"
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   "source": [
    "## 全局设置，语言设置、Nuget包引用、空间引用等"
   ]
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    "//全局设置\n",
    "#!csharp\n",
    "using System.Threading;\n",
    "using System.Threading.Channels;\n",
    "using System.Threading.Tasks;\n",
    "\n",
    "//全局变量\n",
    "var noteBookThreadDesc = \"NoteBook线程\";\n",
    "\n",
    "//全局方法\n",
    "//显示线程信息\n",
    "public void ShowThreadInfo(Thread showThread=null, string describe = null)\n",
    "{\n",
    "    if(showThread == null)\n",
    "    {\n",
    "        showThread = Thread.CurrentThread;\n",
    "    }\n",
    "\n",
    "    if(string.IsNullOrWhiteSpace(describe))\n",
    "    {\n",
    "        describe = showThread.Name == null ? \"无名\" : showThread.Name;\n",
    "    }\n",
    "\n",
    "    Console.WriteLine($\"{describe}线程ID：{showThread.ManagedThreadId} \");\n",
    "    Console.WriteLine($\"{describe}线程名：{showThread.Name} \");\n",
    "    Console.WriteLine($\"{describe}线程状态：{showThread.ThreadState} \");\n",
    "    Console.WriteLine($\"{describe}线程模式：{showThread.GetApartmentState()} \");\n",
    "    Console.WriteLine($\"{describe}激活：{(showThread.IsAlive ? \"活动\" : \"非活动\")} \");\n",
    "    Console.WriteLine($\"{describe}线程池线程：{(showThread.IsThreadPoolThread ? \"是的\" : \"否\")} \");\n",
    "    Console.WriteLine($\"{describe}后台线：{(showThread.IsBackground ? \"是的\" : \"不是\")} \");\n",
    "    Console.WriteLine($\"{describe}区域：{showThread.CurrentCulture}\");\n",
    "    Console.WriteLine($\"{describe}UI区域：{showThread.CurrentUICulture}\");\n",
    "    Console.WriteLine($\"{describe}优先级：{showThread.Priority}\");\n",
    "}\n",
    "\n",
    "//显示线程状态\n",
    "public void ShowThreadState(Thread showThread=null, string describe = null)\n",
    "{\n",
    "    if(showThread == null)\n",
    "    {\n",
    "        showThread = Thread.CurrentThread;\n",
    "    }\n",
    "\n",
    "    if(string.IsNullOrWhiteSpace(describe))\n",
    "    {\n",
    "        describe = showThread.Name == null ? \"无名\" : showThread.Name;\n",
    "    }\n",
    "    Console.WriteLine($\"{describe}线程状态：{showThread.ThreadState} \");\n",
    "}"
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   "source": [
    "## ThreadStatic Attribute 属性的实现"
   ]
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   "source": [
    "在 .NET 中标记了[ThreadStatic]特性的全局变量就是托管线程本地变量。  <br/>\n",
    "\n",
    "在 .NET 中，每个托管对象都关联一个TLB(Thread Local Block)表，TLB表以 AppDomain ID 为索引保存 TLM(Thread Local Module)表，TLM表以模块ID为索引保存托管线程本地存储空间的开始地址。当 .NET 运行时加载一个程序集时，会枚举程序集中的模块与模块中的全局变量，然后按是否线程本地变量分成两部分，非线程本地变量会保存在 AppDomain 对应的高频堆中；而线程本地变量只计算偏移值，存储空间会在首次访问时分配。 "
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    "{ //隔离代码\n",
    "\n",
    "    Console.WriteLine(\"花括号隔离代码,避免上下段互相影响！\");\n",
    "}"
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    "public class Demo\n",
    "{\n",
    "\n",
    "    \n",
    "}\n",
    "{\n",
    "\n",
    "\n",
    "}"
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