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Many early operating systems regarded processes as different timesharing users. The process abstraction is a popular way to organize concurrent programs, but it is not the only choice. In order to build an editing system for multiple users, a traditional organization would be that each user runs as a separate process, all those processes executing the same code, which is shared among them. An alternative organization would be for each user to send a request to a single editing server process. This corresponds to a process abstraction with a single server process that maintains queues of work to do: this process never blocks as long as there is work to do, but completes (natural break), each work item it starts then switches to working on another pending work item. In particular, the application does not block awaiting input but instead polls to find if input from another client is available: processing requests are typically divided into several work items that may be immediately queued for work to be done, Requests may be delayed pending completion of other work requests. The server process opens, modifies, and saves files on behalf of any of its clients. Discuss this alternative vis-à-vis implementing the program as per user processes coordinated by a general-purpose operating system.
Virtual addresses are made up of two parts: the ?rst part is the page number, and the second part is an offset inside that page. Suppose our pages are 4kb (4096 = 212 bytes) long,
what are operating system services
why we say " OS is a resource allocator" and “OS is a control program"?
Briefly discuss on Bankers algorithm? The resource-allocation graph algorithm is not applicable to a resource-allocation system with multiple examples for each resource type.
how do semaphores help us in eliminating deadlock conditions?
Q. Several CPU-scheduling algorithms are parameterized for instance the RR algorithm requires a parameter to indicate the time slice. Multilevel response queues require parameters
Explain Components of conflict phase of dispatch latency The conflict phase of dispatch latency has two components 1. Preemption of any process running in the kernel. 2.
LRU page replacement In least lately used page replacement algorithm we will replace that page that hasn't been used for the longest period of time. This is similar as an opti
Define an assembly language Assembly language stands for a Low level programming language
What is the purpose of system programs? System programs can be thought of as bundles of useful system calls. They give basic functionality to users and so users do not require
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