This book covers the following topics: OS History, computer System Structures, Operating System Structures, Processes, Interprocess Communication, Threads, Nachos, Mutual Exclusion, Semaphores, Implementing Semaphores, Locks and CVs, Readers/Writers Problem, Non-preemptive Scheduling, Preemptive Scheduling, Complex CPU Scheduling, Deadlock, Deadlock Detection, Deadlock Avoidance, Static Memory Allocation, Dynamic Alloc., Relocation, Dynamic Reloc., Segmentation, Paging, Demand Paging, Page Replacement, File System Operations, File System Data Structures, File System Implementation, File System Improvement, Disk Management, Distributed Operating Systems and Networking.