{"id":8758,"date":"2019-02-22T12:14:00","date_gmt":"2019-02-22T12:14:00","guid":{"rendered":"https:\/\/www.monsterindia.com\/career-advice\/commonly-asked-operating-system-interview-questions-8758\/"},"modified":"2021-12-30T12:38:34","modified_gmt":"2021-12-30T12:38:34","slug":"commonly-asked-operating-system-interview-questions","status":"publish","type":"post","link":"https:\/\/www.foundit.com.ph\/career-advice\/commonly-asked-operating-system-interview-questions\/","title":{"rendered":"Commonly asked Operating System Interview Questions"},"content":{"rendered":"\n

What is an Operating System?<\/strong> <\/span><\/p>\n\n\n\n

An operating system is system software that directs computer hardware and software resources. It also offers common services for computer programs. Time-sharing operating systems program tasks for proficient use of the system. It might also include accounting software for cost provision of processor time, printing, mass storage and other resources.<\/span><\/p>\n\n\n\n

Explain the Concept of Reentrancy.<\/strong><\/span><\/p>\n\n\n\n

A Reentrant procedure is one in which numerous users can share one copy of a program at the same time.<\/span><\/p>\n\n\n\n

Reentrancy has 2 key aspects. The program code cannot fix itself and the local data for each user method must be stored independently. The constant part is the code and the transitory part is the pointer back to the calling program and local variables used by the program.<\/span><\/p>\n\n\n\n

Each implementation instance is called activation. It executes the code in the stable part but has its own copy of local parameters\/variables. The temporary part related to each instigation is the activation record. Usually the activation record is kept on the stack.<\/span><\/p>\n\n\n\n

A Reentrant process can be interrupted and called by an interrupting program. It still executes correctly on returning to the procedure.<\/span><\/p>\n\n\n\n

What is a Binary Semaphore? What is its Use?<\/strong> <\/span><\/p>\n\n\n\n

A binary semaphore is one which takes 0&1 as values. They are used to synchronise concurrent processes and apply mutual exclusion.<\/span><\/p>\n\n\n\n

What is Thrashing?<\/strong> <\/span><\/p>\n\n\n\n

It is an experience in virtual memory schemes when the central processing unit changes pages rather than fulfilling instructions. This is due to an excessive number of page faults. <\/span><\/p>\n\n\n\n

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