#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <assert.h>

void *thread_func_2(void* args)
{
    puts("thread_func_2"); /* hang up here */
}

void *thread_func_1(void* args)
{
    int ret;
    pid_t pid;

    puts("thread_func_1");

    pid = fork();

    assert(pid != (pid_t)-1);

    if (pid != 0) /* parent process */
    {
        int status;

        printf("parent process (child pid = %d)\n", pid);

        waitpid(pid, &status, 0);

        puts("parent process end");
    }
    else /* child process */
    {
        pthread_t thread;

        puts("child process");

        ret = pthread_create(&thread, NULL, thread_func_2, NULL);
        assert(ret == 0);

        ret = pthread_join(thread, NULL);
        assert(ret == 0);

        puts("child process end");
    }

    return args;
}

int main()
{
    int ret;
    pthread_t thread;

    ret = pthread_create(&thread, NULL, thread_func_1, NULL);
    assert(ret == 0);

    ret = pthread_join(thread, NULL);
    assert(ret == 0);
}