Robert Rolls <implatform@netspace.net.au> wrote:
> 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 .....?

"Jon Skeet [C# MVP]" <skeet@pobox.com> wrote in message
news:MPG.1d1f3597666c7a3f98c34c@msnews.microsoft.com...
> Robert Rolls <implatform@netspace.net.au> wrote:
>> 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 .....?
>
> 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.
>
> --
> Jon Skeet - <skeet@pobox.com>
> http://www.pobox.com/~skeet
> If replying to the group, please do not mail me too