实现线程A和B，C，实现线程的子进程，父进程杀死子进程，子进程杀死父进程，C++代码实现

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

void child_process() {
printf("Child process started\n");
sleep(5);
printf("Child process finished\n");
}

void parent_process(pid_t pid) {
printf("Parent process started\n");
sleep(2);
printf("Killing child process with id %d\n", pid);
kill(pid, SIGTERM);
printf("Parent process finished\n");
}

int main() {
pid_t pid = fork();

if (pid == -1) {
printf("Error: Failed to create child process\n");
exit(1);
} else if (pid == 0) {
child_process();
} else {
parent_process(pid);
}

return 0;
}