.NET程序默认启动线程数
问:一个.NET程序在运行时到底启动了多少个线程?
答:至少3个。
- 启动CLR并运行Main方法的主线程
- 调试器帮助线程
- Finalizer线程
class Program { static void Main(string[] args) { Console.WriteLine("Main thread: {0}", Thread.CurrentThread.ManagedThreadId); Console.ReadKey(); } }
ProcessExplorer
http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx)
通常,CLR会根据情况启动更多的特殊线程。
- Finalizer线程:该线程负责运行GC进行垃圾对象回收。
- 并发的GC线程:GC会根据情况启动更多的线程并发进行垃圾回收。
- 服务器GC线程:在服务器GC模式下,CLR可能会为多核机器的每个核创建GC托管堆和回收线程。
- 调试器帮助线程:该线程负责为类似WinDbg等调试器提供帮助。
- AppDomain卸载线程:CLR可能会启动一个工作线程来卸载应用程序域。
- ThreadPool线程:ThreadPool会根据情况创建线程。
Short answer, there are other threads with the main thread that are required to support the application.
This can be tested in Visual Studio.
Create a simple Console application. Put a debug point, and start debugging. Once the application gets to that debug point, open "Threads" windows by
Debug -> Windows -> Threads
You will see something like:
Some of the above threads are for debugger, but mostly an app would have main thread, GC (Garbage Collection) and Finalizer thread etc.
参考:
http://www.cnblogs.com/gaochundong/archive/2013/04/18/dotnet_app_default_thread_count.html
http://stackoverflow.com/questions/38854906/default-threading-model-for-a-net-application