Computer Science 330
Operating Systems

Fall 2022, Siena College

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Agenda

• Announcements
  • The next readings/activities from OS zyBook: Chapter 3, due Friday, September 23
• Looking at the exercises for OS zyBook Chapter 2
• PCBs and process creation in FreeBSD
• Developing a design for the fast-food restaurant DES model

Examples

• In https://github.com/SienaCSISOperatingSystems/procsthreads-examples: forking, forkbomb

Terminology

• process
• process control block (PCB)
• process states: new, terminated, suspended, running, ready, blocked
• context switch
• CPU state
• physical CPU
• time sharign
• virtual CPU
• process creation hierarchy
• create process function
• destroy process function
• resource control block (RCB)
• allocated resource/free resource
• request resource function
• release resource function
• scheduler function