#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>

#define MAX_LOOP_THREAD 1000
#define EXIT_CHAR 'c'

uint32_t sharedVar1 = 0;

pthread_mutex_t mtxForShV1 = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t mtxForShV2 = PTHREAD_MUTEX_INITIALIZER;

void *thread1_main(void *arg)
{
    int32_t loop = 0;
    int32_t tmp = 0;

    while (loop<MAX_LOOP_THREAD)
    {
        sharedVar1 = 11;
        tmp = sharedVar1;

        usleep(50000); //50ms - Assume some operations here

        if (tmp != sharedVar1) {
          printf("thread:%d, sharedVar1= %u and tmp = %d differ\n",
          *(int*)arg, sharedVar1, tmp);
        }
        else {
          printf("thread:%d, sharedVar1= %u, tmp = %d\n",
          *(int*)arg, sharedVar1, tmp);
        }
        
        loop++;
    }

    pthread_exit((void *) 0);

    return NULL;
}

void *thread2_main(void *arg)
{
    int32_t loop = 0;
    int32_t tmp = 0;

    while (loop<MAX_LOOP_THREAD)
    {
        
        sharedVar1 = 21;
        tmp = sharedVar1;

        usleep(50000); //50ms - Assuming some operations here
        
        if (tmp != sharedVar1) {
          printf("thread:%d, sharedVar1= %u and tmp = %d differ\n",
          *(int*)arg, sharedVar1, tmp);
        }
        else {
          printf("thread:%d, sharedVar1= %u, tmp = %d\n",
          *(int*)arg, sharedVar1, tmp);
        }

        loop++;
    }

    pthread_exit((void *) 0);

    return NULL;
}


int main(void)
{
    int32_t status, errorStatus;
    static int32_t data1 = 1, data2 = 2, data3 = 3;
    pthread_t thread1, thread2, thread3;
	
    errorStatus = pthread_create(&thread1, NULL, &thread1_main, &data1);
    if (0 != errorStatus) {
        printf("thread1: pthread_create return errno : %d\n", errorStatus);
        exit(0);
    }

    errorStatus = pthread_create(&thread2, NULL, &thread2_main, &data2);
    if (0 != errorStatus) {
        printf("thread2: pthread_create return errno : %d\n", errorStatus);
        exit(0);
    }

    else {
        
        errorStatus = pthread_join(thread2, (void**)&status);
        if (0 != errorStatus) {
            printf("thread2: pthread_join return errno : %d\n", errorStatus);
            exit(0);
        }

        errorStatus = pthread_join(thread1, (void**)&status);
        if (0 != errorStatus) {
            printf("thread1: pthread_join return errno : %d\n", errorStatus);
            exit(0);
        }
    }

	return 0;
}