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  • A thread is a basic unit of CPU utilization, consisting of a program counter, a stack, and a set of registers, ( and a thread ID. )

Multithreading Models

  • There are two types of threads to be managed in a modern system: User threads and kernel threads.

Many-To-One Model

  • In the many-to-one model, many user-level threads are all mapped onto a single kernel thread.


One-To-One Model

  • The one-to-one model creates a separate kernel thread to handle each user thread.


Many-To-Many Model

  • The many-to-many model multiplexes any number of user threads onto an equal or smaller number of kernel threads, combining the best features of the one-to-one and many-to-one models.


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