GATE | GATE CS 2012 | Question 8
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.
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Last Updated :
28 Jun, 2021
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