/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   mutex_basics.c                                     :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ruiferna <ruiferna@student.42porto.com>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/10/07 16:09:59 by ruiferna          #+#    #+#             */
/*   Updated: 2025/10/07 20:25:56 by ruiferna         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include <stdio.h>
#include <pthread.h>
#include <stdlib.h>
#include <sys/time.h>

void *increase_amount(void *arg);

pthread_mutex_t mutex;

int main()
{
	pthread_t thread1;
	pthread_t thread2;
	pthread_t thread3;
	pthread_t thread4;

	int value = 0;
	struct timeval start, end;
	long long elapsed_ms;

	pthread_mutex_init(&mutex, NULL);

	gettimeofday(&start, NULL);

	pthread_create(&thread1, NULL, increase_amount, &value);
	pthread_create(&thread2, NULL, increase_amount, &value);
	pthread_create(&thread3, NULL, increase_amount, &value);
	pthread_create(&thread4, NULL, increase_amount, &value);

	pthread_join(thread1, NULL);
    pthread_join(thread2, NULL);
	pthread_join(thread3, NULL);
    pthread_join(thread4, NULL);

	gettimeofday(&end, NULL);
	elapsed_ms = (long long)(end.tv_sec - start.tv_sec) * 1000LL + (end.tv_usec - start.tv_usec) / 1000LL;

	pthread_mutex_destroy(&mutex);
	printf("counter: %d\n", value);
	printf("time: %lld ms\n", elapsed_ms);
	return (0);
}

void *increase_amount(void *arg)
{
	pthread_mutex_lock(&mutex);
	int *amount = (int *)arg;
	int i = 0;
	while (i < 1000)
	{
		*amount +=1;
		i++;
	}
	pthread_mutex_unlock(&mutex);
	return (NULL);
}