#include<stdio.h>
#define HAVE_STRUCT_TIMESPEC
#include<pthread.h>

pthread_t tid[2];
unsigned int shared_data = 0;

pthread_mutex_t mutex;
unsigned int rc;
//prototypes for callback functions

void* PrintEvenNumbers(void*);
void* PrintOddNumbers(void*);

void main(void)
{
    pthread_create(&tid[0], 0, &PrintEvenNumbers, 0);
    pthread_create(&tid[1], 0, &PrintOddNumbers, 0);
    sleep(3);

    pthread_join(tid[0], NULL);
    pthread_join(tid[1], NULL);
}

void* PrintEvenNumbers(void* ptr)
{
    rc = pthread_mutex_lock(&mutex);

    do
    {
        if (shared_data % 2 == 0)
        {
            printf("Even:%d\n", shared_data);
            shared_data++;
        }
        else
        {
            rc = pthread_mutex_unlock(&mutex); //if number is odd, do not print, release mutex
        }
    }
    while (shared_data <= 10);
}

void* PrintOddNumbers(void* ptr1)
{
    rc = pthread_mutex_lock(&mutex);

    do
    {
        if (shared_data % 2 != 0)
        {
            printf("Odd:%d\n", shared_data);
            shared_data++;
        }
        else
        {
            rc = pthread_mutex_unlock(&mutex); //if number is even, do not print, release mutex
        }
    }
    while (shared_data <= 10);
}