ansaurus

Question

Does WCF execute the operations in a Singleton WCF service in the same thread?

Answer 1

+3 A:

No,

Each request is answered in a different thread. the InstanceContextMode.Single attribute specifies that the service uses the same object (and its members) for each request.

Gilad 2010-09-06 12:47:14

For clarity, each request/thread is queued to use that same object

Henk Holterman 2010-09-06 12:55:52

Answer 2

+1 A:

Be aware that threads in WCF are handled by ThreadPool => Thread is not disposed after request processing but returned to pool so it can be reused for other request processing. I'm not sure how this works with ThreadLocal<T> but with ThreadStaticAttribute this can easily pass the value from one request processing to next random request processing which will use the same Thread.

Ladislav Mrnka 2010-09-06 13:27:17

Okay, but a thread can't be used to execute more than one operation at the same time. So I'm safe if I delete the ThreadStatic/ThreadLocal<> variable after each operation?

Sandeep 2010-09-06 15:13:49

I don't know about any thread switching in WCF so I say yes you should be safe. But if you find some strange non deterministic behavior in your application this should be first area you check.

Ladislav Mrnka 2010-09-06 19:42:40

Actually there can be perhaps thread switching in asyncronous service operations but I think you don't use them: http://msdn.microsoft.com/en-us/library/ms734701.aspx

Ladislav Mrnka 2010-09-06 19:52:06

ansaurus

tags:

views:

answers:

Does WCF execute the operations in a Singleton WCF service in the same thread?

related questions