#include<unistd.h>
#include<pthread.h>
#include<stdio.h>


int shared_variable = 0;

void *thread_a(void *param){
	for(int i = 0; i < 10; i++){
		sleep(1);
		int old_value = shared_variable;
		sleep(1);
		shared_variable = old_value + 10;;
		printf("thread_a:  Changing shared_variable to %d\n", shared_variable);
	}
	return 0;
}

int main(){

	pthread_t thread_object;
	pthread_create(&thread_object, 0, thread_a, 0);
	for(int i = 0; i < 10; i++){
		sleep(1);
		int old_value = shared_variable;
		sleep(2);
		shared_variable = old_value + 10;;
		printf("Main:  Changing shared_variable to %d\n", shared_variable);
	}
	
	sleep(2);
	return 0;
}