What are level in the thread?

[Richi Dubey]

Hi,

Can someone please help me understand what is meant by level? What is meant
by the dispatch level and the pin level and other such definitions? I just
want a high-level idea of what we achieve by having levels and why we need
them.

Why do we have:

 _Assert( cpu_self->thread_dispatch_disable_level == 1 );

in some codes?
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