#include int main() { int i; for (i=0; i

Q: What is GATE-CS?

GATE-CS is a competitive examination conducted in India. This question is from the 2019 GATE-CS Operating Systems paper.

Q: How can I prepare for GATE-CS Operating Systems?

To prepare for GATE-CS Operating Systems, practice previous year questions (PYQs), understand concepts thoroughly, and solve mock tests regularly. This 2019 question covers System Calls topic.

Q: What is the difficulty level of this question?

This GATE-CS 2019 Operating Systems question has a medium difficulty level and is marked as an important question.

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You can find more GATE-CS previous year questions on AspirantMitraa. Browse by subject, topic, year, and difficulty level to practice effectively.

Question

#include <unistd.h>
int main() {
    int i;
    for (i=0; i<10; i++)
        if (i%2 == 0) fork();
    return 0;
}The total number of child processes created is ________

Accepted Answer

Answer: 31Concept: fork() System Call and Process DoublingThe fork() call is invoked when i is even: i = 0, 2, 4, 6, 8 — five times. Each fork() call doubles the number of currently running processes (the original process plus the new child both continue). Starting with 1 process:After i=0 (1st fork): 2 processes.After i=2 (2nd fork): 4 processes.After i=4 (3rd fork): 8 processes.After i=6 (4th fork): 16 processes.After i=8 (5th fork): 32 processes.Total processes at end = 2⁵ = 32. Total child processes created = 32 - 1 = 31 (excluding the original parent). Each fork() call creates exactly as many new children as there are processes running at that point, so: 1 + 2 + 4 + 8 + 16 = 31 child processes.Definition: fork() creates a new child process that is an exact copy of the parent. Both continue execution from the next instruction. The number of processes doubles with each successful fork.

#include <unistd.h> int main() { int i; for (i=0; i<10; i++) if (i%2 == 0) fork(); return 0; }The total number of child processes created is ________

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#include <unistd.h> int main() { int i; for (i=0; i<10; i++) if (i%2 == 0) fork(); return 0; }The total number of child processes created is ________

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#include &lt;unistd.h&gt; int main() { int i; for (i=0; i&lt;10; i++) if (i%2 == 0) fork(); return 0; }The total number of child processes created is ________

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#include &lt;unistd.h&gt; int main() { int i; for (i=0; i&lt;10; i++) if (i%2 == 0) fork(); return 0; }The total number of child processes created is ________

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More Questions from System Calls

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#include <unistd.h> int main() { int i; for (i=0; i<10; i++) if (i%2 == 0) fork(); return 0; }The total number of child processes created is ________

#include <unistd.h> int main() { int i; for (i=0; i<10; i++) if (i%2 == 0) fork(); return 0; }The total number of child processes created is ________