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So in the book "Operating System Concepts"

"Operating systems aren't aware of user thread" are mentioned in the book.

Then who is going to do the mapping of user thread to kernel thread?

For one-to-one model, if Operating systems cannot see user level thread, how could he spawn one kernel thread when one user thread is created?

I have search and following post doesnt answer the questions.

Luk Aron
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  • If you have read [that answer](https://stackoverflow.com/a/15984127/3440745) for the referenced question, then you should get that it is a **language** (the underlying **library**) which does all work for mapping user threads into the kernel ones. This languate(library) also replaces all requests from user threads into the system calls, which operates on the kernel threads basis. – Tsyvarev Oct 11 '21 at 13:22

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