Computer Science 330
Operating Systems

Spring 2012, Siena College

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Agenda

• Announcements
• We will meet for lab tomorrow at 9:20 to refresh and enhance your Unix and C expertise.
• Lecture assignment 1 recap
• Historical development of operating systems
  • Very early systems
  • Multiprogramming batch systems
  • Time sharing systems
  • PCs
  • Today's multiuser workstation/PCs
  • Parallel and distributed systems
  • Real-time systems
  • Handheld systems
• Processes
  • What is a process?
  • Process states
  • Process Control Block, context switching

No New Lecture Assignment

The problems assigned here originally have been moved to the next lecture assignment.

Examples

• FreeBSD Process Control Block: see /usr/src/sys/sys/proc.h (line 463) and /usr/src/sys/sys/user.h (line 223) for architecture-independent parts of the structure, /usr/src/sys/i386/pcb.h for the i386-specific parts.