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Higher Study | Operating Systems | Process and Thread

System calls are usually invoked by using
Consider the following code. int count = 0; void *thfun () { int ctr=0; for (ctr=0; ctr<100; ctr++)      count++; } If thfun is executed by two threads concurrently in a uniprocessor system, what will be the MINIMUM value of count when both threads complete their execution? Assume that count++ is performed using three instructions: (i) read value of count from memory to a CPU register R, (ii) increment R, and (iii) store the value of R in memory. 
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Which of the following process of an operating system is shown in this figure? 
What name is given to a program in execution?
What is the output of the following program? main( ) {                 int a = 10;                 if ((fork ( ) == 0))                 a++;                 printf (“%d\n”, a ); }
On a System with N CPU, what is maximum number of processes that can be in ready state?
Which of the following states of process in operating system is defined incorrectly?
Consider the following statements regarding life time of any normally terminating process in an operating system. (I) The process must be in RUNNING state at least once during its execution. (II) The process must be in RUNNING state at least twice during its execution. (III) The process must be in WAITING state at least once during its execution. (IV) The process must be in READY state at least once during its execution. Which of the above statements are correct?
Which of the following is not a valid process state?
In which of the following cases, a process executing in user mode requires an entry into the OS mode?
Which of the following is an application of utility software?
With respect to operating systems, which of the following is NOT a valid process state?
Which of the following statements about an operating system is FALSE ?
Which of the following types of operating systems is non- interactive?
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