Operating System 3

What is an OS? (remember this slide?) Memory Management Hardware CPU Scheduling User Application Protection Boundary Hardware/ Software interface User Application Device Drivers User Application Kernel File System Disk I/O Process Mang. Networking Multitasking

Process management ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The process ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What’s in a process? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A process’s address space 0x00000000 0xFFFFFFFF address space code (text segment) static data (data segment) heap (dynamic allocated mem) stack (dynamic allocated mem) PC SP

Process states ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

States of a process running ready Waiting exception (I/O, page fault, etc.) interrupt (unscheduled) dispatch / schedule interrupt (I/O complete) You can create and destroy processes! New Terminated Exit Admitted

Listing of all processes in *nix ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The process control block

The PCB revisited ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Process Control Block

PCBs and hardware state ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How do we multiplex processes?

How do we multiplex processes? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Process Control Block

Scheduling queues ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scheduling queues ,[object Object],head ptr tail ptr firefox pcb emacs pcb ls pcb cat pcb firefox pcb head ptr tail ptr Device queue header Ready queue header These are PCBs!

Representation of Process Scheduling ,[object Object],[object Object]

Schedulers ,[object Object],[object Object],[object Object],[object Object]

Schedulers (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]

CPU Switch From Process to Process ,[object Object],[object Object],[object Object]

Process Creation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Process creation (cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A tree of processes on a typical Solaris

*NIX process creation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Exec vs. fork ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Process Termination ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Interprocess communication Mechanism for processes to communicate and to synchronize their actions

Types of Processes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Producer-Consumer Problem ,[object Object],[object Object],[object Object]

Message-Passing System ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Methods of Message-Passing ,[object Object],[object Object],[object Object]

Direct Communication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Indirect Communication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Indirect Communication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Synchronization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Buffering ,[object Object],[object Object],[object Object],[object Object]

In Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conclusion ,[object Object],[object Object],[object Object],[object Object]

References ,[object Object],[object Object],[object Object]

Operating System 3

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Operating System 3

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