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

int mkresult(){
	sleep(random() % 5);
	return random() + 1;
}

int global_count = 0;
int results[2];
pthread_mutex_t our_mutex = PTHREAD_MUTEX_INITIALIZER;

void* thread_function(void* input){
	int result = mkresult();
	pthread_mutex_lock(&our_mutex);
	results[global_count++] = -result;
	pthread_mutex_unlock(&our_mutex);
}

void main(){
	results[0] = 0;
	results[1] = 0;
	srandom(time(0));
	pthread_t t;
	pthread_mutex_lock(&our_mutex);
	pthread_create(&t, 0, thread_function, 0);
	int result = mkresult();
	results[global_count++] = result;
	pthread_mutex_unlock(&our_mutex);
	pthread_join(t, 0);
	printf("results[0] = %d\nresults[1] = %d\n", results[0], results[1]);
}