ISRO2015-37

Question

Consider the following program.

main()
{
    fork();
    fork();
    fork();
}

How many new processes will be created?

• A. 8
• B. 6
• C. 7
• D. 5

Answer 1

No of child process created by $n$ fork calls in series =$2^{n}-1$

With 3 three fork process =7

Option C is correct.

Comments

new processes are 7 but total processes are 8 ryt?

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yes.

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@ManojK,

 Please draw the tree for fork() call, iam getting 8 child process when iam drawing tree of all fork() calls.

Thank You.

Answer 2

If a program has N series of fork call then total number of processes(including parent process) will be created = 2^N.

total number of child processes(New processes) = 2^N - 1

According to our Question, N=3

New processes = 2 ^3 - 1

                       = 7 processes