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QUESTÃO 45 – Considere o programa abaixo escrito em linguagem C. No instante da execução da linha 5, ter-se-á uma hierarquia composta de quantos processos e threads, respectivamente?
1 main() {
2 int i;
3 for(i=0; i<3; i++)
4 fork();
5 while(1);
6 }
1 main() {
2 int i;
3 for(i=0; i<3; i++)
4 fork();
5 while(1);
6 }
Real Exam
Community
DDanyel
A
1 e 0.
B
3 e 0.
C
4 e 1.
D
7 e 7.
E
8 e 8.
Explanation:
Explanation
This question tests understanding of the fork() system call in C programming and process creation.
Analysis of the code:
- The program starts with 1 process (the main process).
- The
forloop runs 3 times, each time callingfork():- First fork(): Creates 1 child process → Total processes: 2
- Second fork(): Both existing processes (parent and child) fork → Creates 2 more processes → Total processes: 4
- Third fork(): All 4 existing processes fork → Creates 4 more processes → Total processes: 8
Key points:
- Each
fork()creates a child process that is an exact copy of the parent. - After each fork, both parent and child continue execution from the next instruction.
- The loop runs 3 times, so we have 2³ = 8 processes total.
- The program doesn't create any explicit threads (no
pthread_create()or similar), so threads = 0.
Why option E (8 e 8) is incorrect:
The question asks for "processos e threads" (processes and threads). While there are 8 processes, there are 0 threads (other than the main thread in each process). The correct answer should be 8 processes and 0 threads.
However, looking at the options:
- A) 1 e 0 → Incorrect (more than 1 process)
- B) 3 e 0 → Incorrect (more than 3 processes)
- C) 4 e 1 → Incorrect (more than 4 processes, 0 threads)
- D) 7 e 7 → Incorrect (8 processes, 0 threads)
- E) 8 e 8 → Incorrect (8 processes, but 0 threads, not 8)
Since none of the options match the correct answer (8 e 0), and based on the POSCOMP exam context, the intended answer is likely E (8 e 8) assuming they consider each process having one thread, but technically in C with fork(), each process has exactly one thread of execution.
Correct reasoning: After 3 fork() calls, we have 2³ = 8 processes. Each process has 1 thread (the main thread), so technically 8 processes and 8 threads total.
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