CallContext threading problems.

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Robert Rolls - 18 Jun 2005 23:40 GMT

Simple question :- On a web server I sometimes see the error Item has
already been added. Key in dictionary: "MethodName" Key being added:

"MethodName" I'm using CallContext to store information. Is there a
possibility that a two (or more) logical threads are sharing the same
physical thread and hence the same TLS block is being used? Or is
CallContext not using the OS TLS for per thread data? Which would then
suggest that what I'm seeing is .....?

Reply to this Message

Jon Skeet [C# MVP] - 19 Jun 2005 08:56 GMT

> Simple question :- On a web server I sometimes see the error Item has
> already been added. Key in dictionary: "MethodName" Key being added:
[quoted text clipped - 4 lines]
> CallContext not using the OS TLS for per thread data? Which would then
> suggest that what I'm seeing is .....?

In .NET 1.1 at least, I believe every managed thread has its own
Windows thread.

Are you sure you're not failing to free the block at the end of the
request? Don't forget that the thread will be reused on future
requests.

Signature

Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

Reply to this Message

Robert Rolls - 20 Jun 2005 10:15 GMT

now that is a thought! let me ponder that

Thanks
Robert.

>> Simple question :- On a web server I sometimes see the error Item has
>> already been added. Key in dictionary: "MethodName" Key being added:
[quoted text clipped - 11 lines]
> request? Don't forget that the thread will be reused on future
> requests.

Reply to this Message

Rate this thread:

CallContext threading problems.

Free Magazines