#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>

int arr[10];
pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t mutex2 = PTHREAD_MUTEX_INITIALIZER;

void* writeEvensToFile(void* args){

		pthread_mutex_lock(&mutex1);
		int filedesc = open("nums.txt", O_CREAT | O_RDWR | O_APPEND , 0777);

		float bac = *(float*)args;
		printf("bac: %f\n", bac);

		char buff;
		for(int i = 0 ; i < 10 ; i++){
			if(arr[i] % 2 == 0){
					buff = arr[i] + '0';
					write(filedesc, &buff, 1);
					write(filedesc, "\n", sizeof("\n"));

			}
		}
		close(filedesc);

		pthread_mutex_unlock(&mutex2);
}

void* writeOddsToFile(void* args){
		pthread_mutex_lock(&mutex2);
		int filedesc = open("nums.txt", O_CREAT | O_RDWR | O_APPEND , 0777);

		char buff;
		for(int i = 0 ; i < 10 ; i++){
			if(arr[i] % 2 != 0){
					buff = arr[i] + '0';
					write(filedesc, &buff, 1);
					write(filedesc, "\n", sizeof("\n"));

			}
		}
		close(filedesc);

		pthread_mutex_unlock(&mutex1);
}

int main(){
		for(int i = 0 ; i < 10 ; i++){
				arr[i] = i;
		}
		float x = 10.0;
		int which;

		pthread_t id;
		pthread_t id2;

		printf("Which thread do you want to start, 1 for even\n");
		scanf("%d", &which);

		//mutex1 pou even;
		//mutex2 pou odd;
		pthread_mutex_lock(&mutex1);
		pthread_mutex_lock(&mutex2);


		pthread_create(&id, NULL, writeEvensToFile, &x);
		pthread_create(&id2, NULL, writeOddsToFile, NULL);

		if(which == 1){
				pthread_mutex_unlock(&mutex1);
				sleep(1);
		}
		else{
				pthread_mutex_unlock(&mutex2);
				sleep(1);
		}

}