/*
 * build command: gcc -pthread -o test test.c; ./test
 */

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

#define COUNT                       (10)
#define ASCII_LOW_EN                (0x61)

static bool _Global_Func1_Done =    false;
static void _Func1_Print_Num(void)
{
    int Idx = 0;

    /* Print number 1. */
    for (Idx = 0; Idx < COUNT; Idx++)
    {
        printf("%d\n", Idx + 1);
    }

    /* Set done flag. (or send event to func2) */
    _Global_Func1_Done = true;
}

static bool _Global_Func2_Done =    false;
static void _Func2_Print_Char(void)
{
    int Idx = 0;

    /* Wait func1 done. (or recv event from func1) */
    while (_Global_Func1_Done == false)
    {
        sleep(1);
    }

    /* Print char 'a'. */
    for (Idx = 0; Idx < COUNT; Idx++)
    {
        printf("%c\n", ASCII_LOW_EN + Idx);
    }

    _Global_Func2_Done = true;
}

static void _Create_Task(void * pFunc)
{
    int Ret = 0;
    pthread_t stThread = 0;

    Ret = pthread_create(&stThread, NULL, pFunc, NULL);

    if (Ret != 0)
    {
        printf("pthread_create() fail: return = %d\n", Ret);
    }
}

int main(void)
{
    _Create_Task(_Func2_Print_Char);
    _Create_Task(_Func1_Print_Num);

    /* Wait task done. */
    while ((_Global_Func1_Done == false) ||
           (_Global_Func2_Done == false))
    {
        sleep(1);
    }

    return 0;
}