I’m into the Philosophers project, it is about handling threads and mutexes. For the project I need to create several threads, each thread runs a routine function and accesses shared resources. I discovered that when I test pthread_create() != 0 it causes a broad set of errors, from data race to segfault. When there is a thread error, I want to exit the loop, clean all resources and join created threads, but as they use mutexes I can not free locked values. I was thinking about using pthread_detach but not sure how to do it right.

#include "philo.h"

int create_threads(t_philo *data, t_program *set)
{
    int i;

    i = 0;
    while (i < data->num_of_philos)
    {
        if (pthread_create(&set->philos[i].thread,
                NULL, routine, &set->philos[i]))
        {
            ft_putstr_fd("Error thread create", 2);
            cleanup_all(set);
            return (0);
        }
        i++;
    }
    return (1);
}

int join_threads(t_philo *data, t_program *set)
{
    int i;

    i = 0;
    while (i < data->num_of_philos)
    {
        if (pthread_join(set->philos[i].thread, NULL))
        {
            ft_putstr_fd("Error thread join", 2);
            cleanup_all(set);
            return (0);
        }
        i++;
    }
    return (1);
}

void    cleanup_all(t_program *set)
{
    int i;

    i = 0;
    while (i < set->philos[0].num_of_philos)
    {
        pthread_mutex_destroy(&set->forks[i]);
        i++;
    }
    pthread_mutex_destroy(&set->meal_lock);
    pthread_mutex_destroy(&set->dead_lock);
    pthread_mutex_destroy(&set->write_lock);
    free(set->forks);
    free(set->philos);
}

I tried to modify cleanup function but it is not working as expected. And limits of my project I cant use exit()