线程，应用程序域和工作进程之间的关系

Question

In IIS7 and ASP.NET, what is the exact relationship among:

• IIS Worker Processes
• Threads
• AppDomains
• Applications, and
• incoming requests.

I'm hoping for an answer in a format similar to :

"Each IIS worker process hosts many appdomains which each spawn a single thread in response to each request...." etc. , and any nuances mentioned.

Answer 1

Each worker process hosts several AppDomains (at least one per ASP.NET app, ie a Website or Virtual Directory). An incoming request is assigned a thread from thread pool when it comes.

OP: Q. So each appdomain owns and manages its own thread pool?

Each managed Thread is always assigned to a single AppDomain at a time. The worker process maintains a shared thread pool and it's assigned to a specific AppDomain for the duration of a request.

Answer 2

Fritz Onion的书Essential ASP.NET有一章关于HTTP Pipeline ，他在http请求中讨论了上述所有关系。