# Why is there no one to many Multithreading Model?

I am studying various multi-threading models. Here the user threads are mapped to Kernel Threads. They are -

Many to one model.
Many to many model.
one to one model.
`

What kept me wondering was why there is no one to many model ?

• Think about what that would mean and how you would implement it. – D.W. May 19 '18 at 17:16