Processes : Basic Concepts

1. Processes: Basic Concepts CPE 261403 - Operating Systems

2. OS Functions (2.1) Resource Allocation Accounting Protection & Security

3. What happens when a program executes? Example.c void main() { int i=0; i = add (2,3); printf(“%d”,i); } int add(int p1, int p2) { return (p1 + p2); }

4. Process States Figure 3.2

5. Components of a Process Figure 3.1

6. RAM instruction CPU Example.exe Example.exe Hard Drive

7. What goes where in RAM? void main() { int i=0; i = add (2,3); printf(“%d”,i); } int add(int p1, int p2) { return (p1 + p2); }

8. Process Control Blocks Figure 3.3

10. OS RAM Prog1.exe Prog1.exe Prog2.exe Prog2.exe Hard Drive

11. Context Switching Figure 3.4

12. Process 1 Process 2 Execution

13. Process vs Thread

14. Process Queues Figure 3.5

15. Process Scheduling Figure 3.6

16. Process Creation Figure 3.8