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LINUX System : Lecture 7. Bong-Soo Sohn. Lecture notes acknowledgement : The design of UNIX Operating System. process control subsystem. inter-process communication. scheduler. memory management. character. block. device drivers. kernel Level hardware Level.
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LINUX System : Lecture 7
Bong-Soo Sohn
Lecture notes acknowledgement : The design of UNIX Operating System
control
subsystem
inter-process
communication
scheduler
memory
management
character
block
device drivers
kernel Level
hardware Level
Architecture of the UNIXuser programs
libraries
trap
user Level
kernel Level
system call interface
file subsystem
buffer cache
hardware control
hardware
control
subsystem
inter-process
communication
scheduler
memory
management
character
block
device drivers
kernel Level
hardware Level
System calls & Librariesuser programs
libraries
trap
user Level
kernel Level
system call interface
system call interface
file subsystem
buffer cache
hardware control
hardware
System calls & Libraries
- System call library
- OS service in the form of C function call
- Standard library, User library
- Linked with the programs at compile time and are part of the user program
control
subsystem
inter-process
communication
scheduler
memory
management
character
block
device drivers
kernel Level
hardware Level
File Subsystem (1)user programs
libraries
trap
user Level
kernel Level
system call interface
file subsystem
buffer cache
hardware control
hardware
File Subsystem (2)
- Managing files and structures of file system
- Allocating file space
- Administering free space
- Controlling access to files
- Retrieving data for users
- Interact with set of system calls
- open, close, read, write, state, chown, chmod …
control
subsystem
inter-process
communication
scheduler
memory
management
character
block
device drivers
kernel Level
hardware Level
Buffering Mechanism (1)user programs
libraries
trap
user Level
kernel Level
system call interface
file subsystem
buffer cache
hardware control
hardware
Buffering Mechanism (2)
- Interact with block I/O device drivers to initiate data transfer to and from kernel.
control
subsystem
inter-process
communication
scheduler
memory
management
character
block
device drivers
kernel Level
hardware Level
Process Control Subsystem (1)user programs
libraries
trap
user Level
kernel Level
system call interface
file subsystem
buffer cache
hardware control
hardware
Process Control Subsystem (2)
- Managing process structures (proc table, u table,…)
- Process scheduling
- Interprocess communication (IPC)
- Memory management
- Responsible for process synchronization.
- Communicate with file subsystem
- Loading a file into memory for execution
- Interact with set of system calls
- fork, exec, exit, wait, brk, signal …
Process Control Subsystem (3)
- Memory management module
- Control the allocation of memory to a process
- Scheduler module
- Allocate the CPU to processes
- Interprocess communication
- There are several forms.
control
subsystem
inter-process
communication
scheduler
memory
management
character
block
device drivers
kernel Level
hardware Level
Hardware Control (1)user programs
libraries
trap
user Level
kernel Level
system call interface
file subsystem
buffer cache
hardware control
hardware
Hardware Control (2)
- Responsible for handling interrupts and for communicating with the machine.
- Devices such as disks or terminals may interrupt the CPU while a process is executing
Topics to be covered
- File subsystem
- Process control subsystem
- (Memory Management)
- Signal
- IPC (Inter-Process Communication), Synchronization
- UNIX System Programming (System Calls)
Reference Books
- The design of the UNIX Operating System, M. J. Bach
- UNIX Internals : The New Frontiers, U. Vahalia
- Advanced Programming in the Unix Environment, 2nd Edition, W. R. Stevens, S. A. Rago
