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A operating system act as an interface between an user and the computer hardware and It is a set of programs that controls the execution of application programs. An operating system is software that manages the computer hardware as well as providing an environment for application programs to run.
*Every computer depends on an operating system to:
-Keep hardware running efficiently
-Maintains file system
-Manages virtual memory
*Operating system runs continuously when computer is on
Role 1: The Operating System is an Abstract Machine:
Extends the basic hardware with added functionality Provides high-level abstractions
• More programmer friendly
• Common core for all applications
– E.g. Filesystem instead of just registers on a disk controller
It hides the details of the hardware
• Makes application code portable
Role 2: The Operating System is a Resource Manager :
Responsible for allocating resources to users and processes Must ensure
• No Starvation
• Allocation is according to some desired policy
– First-come, first-served; Fair share; Weighted fair share; limits
• Overall, that the system is efficiently used
Some of the homework help topics include :
- Swapping, Page Replacement Algorithms, Files, Directories, File System Management & Optimization, I/O Hardware & Software, Software Layers Disk Hardware, Disk Arm Scheduling; Clocks, Detection, Recovery, Deadlocks Avoidance, Prevention, Multiprocessors, Multi-computers, Virtualization,
- User Authentication, Protection Mechanisms. Insider Attacks, Software Bug Exploits, Malware, Antivirus Techniques, Storage management, Concurrency control, Multi-programming , Processing, Device drivers, Modeling and performance measurement, Scheduling policies for CPU,
- Resource management, auxiliary storage management, resource allocation, OS design ,construction techniques, OS kernels, transaction processing, virtual memory management, device management,
- Concurrency include processes and threads, context switching, synchronization, scheduling, and deadlock ,Memory management include linking, dynamic memory allocation, dynamic address translation, virtual memory, and demand paging ,file systems include storage devices, disk management and scheduling, directories, protection, and crash recovery ,virtual machines,problem set ,Pintos kernel
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Operating Systems homework help for:
- Process types, process states, daemon processes, Inter process data exchange, pipes, FIFO, shared memory, user mode, kernel mode, permit modes, file names, path, file descriptor, typical directory structure, System functions open, close, read and write, UID, GID, SUID, SGID, sticky bit, file owning,
- System volume, structure of volume, block 0, block 1, block 2, i node list, I/O mechanisms, data exchange at character, block devices, Special file, process access to I/O devices, I /O device terminal, input and output fronts, Windows XP, Memory organization and management, distributed systems, Issues in communication, Remote procedure call, Remote method invocation,
- Performance, queuing theory, synchronization of parallel programs , algorithms for mutual exclusion, Boot process, Process states, context switching, programming processes, Threads Process, synchronization messages, mailboxes rendezvous, real-time scheduling, MMU architecture, Recitation canceled, Devices, block , character I/O, disks, Log-structured , special file systems , Network protocols, Sockets architecture,
- Remote file systems Protection, Cryptography, Virtual machines, Graphics , windowing systems , Power management, Anatomy of an OS, UNIX, Windows, Threads, processes, Process creation, death, Process Control Blocks, Process scheduling, Concurrency control, Bootstrapping an OS, Compiling , debugging, Implementation of modules, Performance analysis modules, user interface, Shell, Shell programming, tools for shell scripting, shell cycles, shell trees and shell functions, process running, level of system running,
Operating Systems includes:
- Message and stream-oriented communication, Code migration and distributed scheduling, Clock synchronization, Distributed mutual exclusion and distributed deadlocks, Distributed transaction, Consistency models, Replication, Fault tolerance, Distributed commit and failure recovery,
- Distributed file systems, Security in distributed systems, MINIX, Processes, MINIX Processes, IPC Scheduling, MINIX clock, clock task, clock handler, MINIX system task,
- MINIX I/O,MINIX terminals, MINIX terminal driver ,MINIX memory management, MINIX file system, block cache, i-node, super-block, file descriptor management, MINIX Block Devices, MINIX RAM Disk, MINIX Hard Disk, Dispatch, Real Time and Embedded Systems, System Performance Evaluation, MPI Programming
- Overview of operating systems, functionalities and charateristics of OS ,Hardware concepts related to OS, CPU states, I/O channels, memory hierarchy, microprogramming , concept of a process, operations on processes, process states, concurrent processes, process control block, process context.
- UNIX process control and management, PCB, signals, forks and pipes ,Interrupt processing, operating system organisation, OS kernel FLIH, dispatcher ,Job and processor scheduling, scheduling algorithms, process hierarchies ,Problems of concurrent processes, critical sections, mutual exclusion, synchronisation, deadlock.
- Mutual exclusion, process co-operation, producer and consumer processes ,Semaphores: definition, init, wait, signal operations ,Use of semaphores to implement mutex, process synchronisation etc., implementation of semaphores.
Critical regions, Conditional Critical Regions, Monitors, Ada Tasks ,Interprocess Communication (IPC), Message Passing, Direct and Indirect
- Deadlock: prevention, detection, avoidance, banker's algorithm ,Memory organisation and management, storage allocation.
Virtual memory concepts, paging and segmentation, address mapping.
- Virtual storage management, page replacemant strategies ,File organisation: blocking and buffering, file descriptor, directory structure
File and Directory structures, blocks and fragments, directory tree, inodes, file descriptors, UNIX file structure.
- Secondary Storage Management, disk components, disk scheduling, swap-space management ,Distributed systems, structures, file systems, distributed coordination ,Protection and Security, access rights, access matrix ,Networks, Routing, Connection strategies, remote file systems.