Process & Threads

1. process states

1.1. trace

1.1.1. the behavior of an individual process by listing the sequence of instructions that execute for that process

1.2. dispatcher

1.2.1. small program that switches the processor from 1 process to program

2. process creation

2.1. occurs when a new process is to be added to those currently being managed processes

3. parent process

3.1. the original created process

4. child process

4.1. the new process

5. process termination

5.1. a hatch job should include a HALT instruction / an explicit OS service call for termination

6. OS control structures

6.1. 4 types of tables maintained by the OS

6.1.1. Memory tables

6.1.2. I/O tables

6.1.3. File tables

6.1.4. Process tables

7. suspended processes

7.1. involving moving part of all of a process from main memory to disk

8. Program Elements

8.1. Program code & a set of data associated with that code

8.2. Process of control block

8.2.1. Identifier

8.2.2. State

8.2.3. Priority

8.2.4. Program Counter

8.2.5. Memory pointers

8.2.6. Context data

8.2.7. I/O status information

8.2.8. Accounting information

9. process spawning

9.1. when the OS create a process at the explicit request of another process

10. benefits of threads

10.1. takes less time to create a new thread than a process

10.2. less time to terminate a thread than a process