OPERATING SYSTEM

1. HARDWARES

1.1. cpu

1.2. main memory

1.3. input devices

1.4. output devices

2. USER

3. COMPONENTS OF OS

3.1. KERNEL

3.2. SYSTEM PROGRAMS

3.3. USER INTERFACE

4. CHARACTERISTICS

4.1. SYSTEM CALLS

4.2. CONTEXT SWITCHING

4.3. PERFORMANCE

4.4. CONCURRENCY

5. SOFTWARES

6. PROCESS MODES OF OS

6.1. USER MODE

6.2. KERNEL MODE

6.2.1. INTERRUPTS

6.2.2. TRAPS

6.2.3. SYSTEM CALLS

7. EXECUTES

7.1. PROCESSES

7.2. INTERRUPT

8. FUNCTIONS OF OS

8.1. PROCESS MANAGEMENT

8.2. PROCESS SCHEDULING

8.3. INTER PROCESS COMMUNICATION AND SYNCHRONIZATION

8.4. MEMORY MANAGEMENT

8.5. I/O MANAGEMENT