Chap5

Question 1

Thread specific data

Answer 1

Program counter
Status of the thread
Processor registers
Stack space

Question 2

Thread shares

Answer 2

Program code
Data
Resources

Question 3

UNIX Processes’s address space

Answer 3

Subdivided into text, data, & stack segment
 Program file describes the address space

Question 4

Benefits of multithreaded
programming

Answer 4

Responsiveness
Resource sharing
Ease of memory and resource allocation
Utilization of multiprocessor architectures

Question 5

Process Manager implementations

Answer 5

 Calls like fork() in UNIX and CreateProcess() in windows to create processes.
 Calls like pthread_create() in Linux and CreateThread() in Windows to support threading.
 Calls like close() in Unix and CloseHandle() in Windows to close processes/threads to release resources.

Question 6

Process Descriptors

Answer 6

OS creates/manages process abstraction
Also known as Process Control Block (PCB)

Question 7

Process Descriptors’s data structure for each process

Answer 7

 Process ID
 Program counter
 Register values
 Process state
 Type & location of resources it holds
 List of resources it needs
 Security keys

Question 8

Process States (draw the diagram)

Answer 8

 Running: Instructions are being executed
 Blocked: The process is waiting for some event to
occur (eg, I/O completion)
 Ready: The process is waiting to be assigned to a
processor.
 Done: The process has finished execution

Question 9

Linux State Transition Diagram (draw diagram)