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- Question
Explain the meaning of mutex.
- Correct Answer
- Mutex is the short form for ?Mutual Exclusion object? A mutex allows multiple threads for sharing the same resource The resource can be file A mutex with a unique name is created at the time of starting a program A mutex must be locked from other threads, when any thread that needs the resource When the data is no longer used / needed, the mutex is set to unlock
- 1. Explain the concept of the Distributed systems? Discuss
- 2. Differentiate between Complier and Interpreter? Discuss
- 3. What are necessary conditions for dead lock? Discuss
- 4. What is Dispatcher? Discuss
- 5. What is hard disk and what is its purpose? Discuss
- 6. What is a daemon? Discuss
- 7. What is pre-emptive and non-preemptive scheduling? Discuss
- 8. Which among the following are not the children of Swapper or Scheduler?
Options- A. Process Dispatcher
- B. Vhand
- C. Dbflush
- D. All the above Discuss
- 9. main() { fork(); printf(?Hello World!?); } Output for the above unix program is
Options- A. Hello World!
- B. Hello World!Hello World!
- C. Hello World
- D. None Discuss
- 10. Which among the following is a system call used for process management
Options- A. fork()
- B. exec()
- C. getppid()
- D. All the above Discuss
Operating Systems problems
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Correct Answer: Distributed systems work in a network They can share the network resources, communicate with each other
Correct Answer: An interpreter reads one instruction at a time and carries out the actions implied by that instruction It does not perform any translation But a compiler translates the entire instructions
Correct Answer: 1 Mutual exclusion (where at least one resource is non-sharable) 2 Hold and wait (where a process holds one resource and waits for other resource) 3 No preemption (where the resources can?t be preempted) 4 Circular wait (where p[i] is waiting for p[j] to release a resource i= 1,2,?n j=if (i!=n) then i+1 else 1 )
Correct Answer: Dispatcher module gives control of the CPU to the process selected by the short-term scheduler; this involves: Switching context, Switching to user mode, Jumping to the proper location in the user program to restart that program, dispatch latency ââ?¬â?? time it takes for the dispatcher to stop one process and start another running
Correct Answer: Hard disk is the secondary storage device, which holds the data in bulk, and it holds the data on the magnetic medium of the diskHard disks have a hard platter that holds the magnetic medium, the magnetic medium can be easily erased and rewritten, and a typical desktop machine will have a hard disk with a capacity of between 10 and 40 gigabytes Data is stored onto the disk in the form of files
Correct Answer: Daemon is a program that runs in the background without user?s interaction A daemon runs in a multitasking operating system like UNIX A daemon is initiated and controlled by special programs known as ?processes?
Correct Answer: Preemptive scheduling: The preemptive scheduling is prioritized The highest priority process should always be the process that is currently utilized Non-Preemptive scheduling: When a process enters the state of running, the state of that process is not deleted from the scheduler until it finishes its service time
Correct Answer: All the above
Explanation:
Process Dispatcher,Vhand,Dbflush are the children of Scheduler
Correct Answer: Hello World!Hello World!
Explanation:
The fork creates a child that is a duplicate of the parent process. The child begins from the fork().All the statements after the call to fork() will be executed twice.(once by the parent process and other by child). The statement before fork() is executed only by the parent process
Correct Answer: All the above
Explanation:
All the above listed are the System calls for process management
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