Yes, you're correct -
I was assuming that 1) threads.xs and 2) fork - they both use same underlying engine - ithreads.
I even not bothered to look into implementation details, as it was just enough granulation of details for my particular purposes

Now you're stating that 1) my misunderstanding is manifest and 2) devil in details.

Now this boils down to one of things:

• either, when looking into deep into implementation details I will see that 'fork' and 'threads.xs' are really different beasties, due to devils in details
• or, looking into API that is followed by your link I will eventually understand deep differences between 'threads.xs' and 'fork'

what should break my wrong assumption?
I still fail to see a point of my misunderstanding.

Actually I am inclined to think that my phrases were not clear , they were too vague, due to my English language imperfection, and - so - I do not have deep misunderstanding.

I.e. I do not know about exact implementation details, but I do know that both are using 'ithreads'.

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