Skip to content
Related Articles

Related Articles

Improve Article

GATE | GATE CS 2012 | Question 8

  • Difficulty Level : Medium
  • Last Updated : 28 Jun, 2021
Geek Week

A process executes the code

fork();
fork();
fork(); 

The total number of child processes created is
(A) 3
(B) 4
(C) 7
(D) 8


Answer: (C)

Explanation: Let us put some label names for the three lines

  fork ();    // Line 1
  fork ();   // Line 2
  fork ();   // Line 3

       L1       // There will be 1 child process created by line 1
    /     \
  L2      L2    // There will be 2 child processes created by line 2
 /  \    /  \
L3  L3  L3  L3  // There will be 4 child processes created by line 3

We can also use direct formula to get the number of child processes. With n fork statements, there are always 2^n – 1 child processes. Also see this post for more details.

Quiz of this Question

Attention reader! Don’t stop learning now.  Practice GATE exam well before the actual exam with the subject-wise and overall quizzes available in GATE Test Series Course.

Learn all GATE CS concepts with Free Live Classes on our youtube channel.

My Personal Notes arrow_drop_up
Recommended Articles
Page :