1. Q:(a)Describe the action for a kernel to context switching for threads (b)why it is faster than processes?

2. Q:what’s the Benefits of multithread?
Responsiveness
Resource Sharing
Economy
Scalability

3. Q:what’s the difference of User Threads & kernel thread?
Thread management done by user-level threads library
Three primary thread libraries:
POSIX Pthreads
Win32 threads
Java threads

4. Kernel Threads Supported by the Kernel Examples Windows XP/2000
Solaris
Linux
Tru64 UNIX
Mac OS X

5. Many-to-One One-to-One Many-to-Many
Q:How is the mapping between user thread and kernel thread? Advantage & disadvantage ?
Many-to-One
One-to-One
Many-to-Many

6. Many-to-One Model

7. One-to-one Model

8. Many-to-Many Model
Allows many user level threads to be mapped to many kernel threads
Allows the operating system to create a sufficient number of kernel threads
Solaris prior to version 9
Windows NT/2000 with the ThreadFiber package

9. Many-to-Many Model