Chapter 4: threads and concurrency

Question 1

many to one

Answer 1

Many user-level threads mapped to single kernel thread
One thread blocking causes all to block

Question 2

One-to-one

Answer 2

Each user-level thread maps to kernel thread
Creating a user-level thread creates a kernel thread

Question 3

many-to-many

Answer 3

• Allows many user level threads to be mapped to many
  kernel threads
• Allows the operating system to create a sufficient
  number of kernel threads

Question 4

two-level model

Answer 4

• Similar to M:M, except that it allows a user thread to be
  bound to kernel thread

Question 5

What is a thread

Answer 5

A unit of execution
* Execution within a process
* Faster to create and destroy than a process