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From: Michael Glassford (glassfordm_at_[hidden])
Date: 2004-07-28 09:53:58

Tonko Juricic wrote:

> Stefan Seefeld wrote:
>>That's often impossible: objects and threads are
>>orthogonal by nature: you don't always control what
>>thread executes your code. But as it is your code
>>that needs TLS you may have to inject TLS variables
>>in *any* thread that comes your way, and so it has >
> to be cleaned up in a uniform way.
> Let me try to understand it better. We start with the
> fact that some parts of your code can be executed by
> both boost and non-boost threads.
> A stumbling block in my case is understanding how can
> your code be executed by a non-boost thread unless, at
> some level, you explicitly make it possible.
> So, if I didn't completely miss the point, TLS cleanup
> for non-boost threads is there to spare the programmer
> from having to analyze complex scenarious and calling
> sequences which may lead to a non-boost thread
> visiting the 'unsuspecting' method on your object.

Not necessarily complex scenarios. To take an instance: the main thread
is one that will never be created by Boost.Threads. If your object that
uses TLS is ever called from the main thread, that would be a problem.


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