Consider the following code which uses Python to call the ‘fork’ system call. Line numbers are given just for your reference.
1 x = -1
2 pid = os.fork()
3 time.sleep(1)
4 if pid == 0:
5 x = 0
6 print “The value of x is ” + str(x)

Select all of the following statements that are true (incorrect selections will reduce your overall marks for this question).

Question

Consider the following code which uses Python to call the ‘fork’ system call. Line numbers are given just for your reference. 
 1	x = -1
2	pid = os.fork()
3	time.sleep(1)
4	if pid == 0:
5	     x = 0
6	print “The value of x is ” + str(x) 
 
 Select all of the following statements that are true (incorrect selections will reduce your overall marks for this question).

Accepted Answer

Assuming that the scheduler runs the parent process to completion first, the output of the program will be:

The value of x is -1 
 The value of x is 0

Accepted Answer

At line 3 the sleep function is called. This line is executed by both the parent and child processes.

Answer

Line 5 is executed by the parent process and its child processes.

Answer

Assuming that the scheduler runs the parent process to completion first, the output of the program will be:

The value of x is 0

Answer

The fork call executes a new program.

Crowdly

Consider the following code which uses Python to call the ‘fork’ system call. Li...

Want instant access to all verified answers on qmplus.qmul.ac.uk?