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

pthread_t tid[10000];
pthread_mutex_t mtx;
int count=0;

double r()
{
    return (double)rand() / (double)RAND_MAX ;
}

float distanta(float x,float y,float z,float t)
{

        return sqrt((x-y)*(x-y)+(z-t)*(z-t));
}

void* function(void* arg)
{
        int nr=*(int*)arg;
        int i;
        pthread_mutex_lock(&mtx);
        //printf("Threadul %d : \n",nr);
        for(i=0;i<10000;i++)
                {
                        float random1=r();
                        float random2=r();
                        float random3=r();
                        float random4=r();
                        if(distanta(random1,random2,random3,random4)<0.50)
                                count++;
                }
        //printf("\n");
        //printf("Count este momentan: %d \n",count);
        pthread_mutex_unlock(&mtx);

}

int main()
{
        srand(time(0));

        pthread_mutex_init(&mtx,NULL);
        int nr[10000];
        int i;
        for(i=0;i<10000;i++)
                nr[i]=i;
        for(i=0;i<10000;i++)
                pthread_create(&tid[i],NULL,function,&nr[i]);
        for(i=0;i<10000;i++)
                pthread_join(tid[i],NULL);

        printf("procentul  este: %f \n", (float)100*count/100000000);
        return 0;
}