OS_Threads_PYQ

The maximum number of processes that can be in Ready state for a computer system with n CPUs is

• n2

• n

• 2n

• Independent of n

Which of the following is TRUE regarding the time taken to switch between user and kernel modes of execution?

• t1 > t2

• nothing can be said about the relation between t1 and t2

• t1 = t2

• t1 < t2

Which of the following is/are shared by all the threads in a process?

• Registers

• Address space

• Stack

• Program Counter

A process executes the code fork(); fork(); fork(); The total number of child processes created is

• 3

• 8

• 4

• 7

A scheduling algorithm assigns priority proportional to the waiting time of a process. Which one of the following is TRUE?

• This algorithm is equivalent to the first-come-first-serve algorithm

• This algorithm is equivalent to the shortest-remaining-time-first algorithm

• This algorithm is equivalent to the round-robin algorithm

• This algorithm is equivalent to the shortest-job-first algorithm

Consider the following statements about process state transitions for a system using preemptive scheduling. Which of the above statements are TRUE?

• II and III only

• I, II and III only

• I, II, III and IV

• I, II and IV only

Which of the following standard C library functions will always invoke a system call when executed from a single-threaded process in a UNIX/Linux operating system?

• malloc

• exit

• strlen

• sleep

A thread is usually defined as a 'light weight process' because an operating system (OS) maintains smaller data structures for a thread than for a process. Which of the following is TRUE?

• On per-thread basis, the OS does not maintain virtual memory state

• The OS does not maintain a separate stack for each thread

• On per-thread basis, the OS maintains only CPU register state

• On per-thread basis, the OS maintains only scheduling and accounting information

The following C program is executed on a Unix/Linux system. The total number of child processes created is _________.

• 0

• 5

• 10

• 15

Threads of a process share

• Both heap and global variables

• Heap but not global variables

• Neither global variables nor heap

• Global variables but not heap