Async Methods, Callback (What Thread)

[scott ocamb]

hello

I have implemented a solution using async methods. There is one async
method that can be invoked multiple times, ie there are multiple async
"threads" running at a time.

When these threads are complete, the call the Callback method. Each "thread"
calls the same callback method.

What thread does this callback method exist on? My testing indicates the
callback method is not blocked when executed from a given thread when it
completes.

For example thread 1 can execure it's callback , while thread 2 executes
it's callback. No blocking seems to occur.

Any help getting me to understand this would be appreciated.

 

[Peter Huang [MSFT]]

Hi Scott,

I think the CallBack function is reentrant, i.e. each thread that calls the
callback function will have its own function call back stack. Therefore the
this callback method exist on every thread that call the function. If you
want to program multithread application, you may need to synchronize the
data that will be access by the callback function.

Here is a link about Synchronizing Data for Multithreading.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/htm
l/cpconmanagedthreadingsupport.asp


Regards,
Peter Huang
Microsoft Online Partner Support
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