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

static void wait_thread(void)
{
    time_t start_time = time(NULL);

    while (time(NULL) == start_time)
    {
        /* do nothing except chew CPU slices for up to one second. */

        usleep(10000);

	//~ struct timespec ts;
	//~ ts.tv_sec = 0;
	//~ ts.tv_nsec = 1000;
	//~ nanosleep((const struct timespec *)&ts, NULL);
    }
}

static void *thread_func(void *vptr_args)
{
    int i;

    for (i = 0; i < 10; i++)
    {
        fputs("  b\n", stderr);
        wait_thread();
    }

    return NULL;
}

int main(void)
{
    int i;
    pthread_t thread;

    if (pthread_create(&thread, NULL, thread_func, NULL) != 0)
    {
        return EXIT_FAILURE;
    }

    for (i = 0; i < 10; i++)
    {
        puts("a");
        wait_thread();
    }

    if (pthread_join(thread, NULL) != 0)
    {
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}