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/**
* il padre crea 2 figli ma attende la terminazione solo di uno specifico di essi
*/
#include
#include
#include
#include
int main() {
pid_t pid1, pid2;
int i;
pid1 = fork(); // creo un primo figlio
if (pid1 == 0) { // processo figlio (lento)
for (i = 0; i < 15; i++) {
sleep(rand() % 4);
printf("Sono il FIGLIO LENTO [%d].\n", getpid());
}
printf("Sono il FIGLIO LENTO [%d] e ho finito.\n", getpid());
exit(0);
}
sleep(2); // gli diamo un po' di vantaggio
pid2 = fork(); // creo un secondo figlio
if (pid2 == 0) { // processo figlio (veloce)
for (i = 0; i < 20; i++) {
sleep(rand() % 2);
printf("Sono il FIGLIO VELOCE [%d].\n", getpid());
}
printf("Sono il FIGLIO VELOCE [%d] e ho finito.\n", getpid());
exit(0);
}
// processo padre
sleep(rand() % 2);
printf("Sono il processo PADRE e mi metto in attesa del figlio veloce [%d]...\n", pid2);
waitpid(pid2, NULL, 0);
printf("Sono il processo PADRE e ho terminato il mio lavoro.\n");
exit(0);
}