Правильное высвобождение разделяемой памяти и мьютексов в многопотоке

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <sys/mman.h>
#include <pthread.h>
 
#define SHARED_MEM_SIZE 64
#define MAX_CLIENTS 4
 
#define ERROR_EXIT(message)\
do\
{\
    perror(message);\
    exit(EXIT_FAILURE);\
} while(0);\
 
 
char *shared_mem[MAX_CLIENTS];
 
pthread_mutex_t mutex[MAX_CLIENTS];
 
void *process_client(void *arg) {
    int client_id = *(int *)arg;
    char *mem = shared_mem[client_id];
    while (1) {
    if (pthread_mutex_lock(&mutex[client_id]) != 0)
        ERROR_EXIT("pthread_mutex_lock");
 
        if (strlen(mem) > 0) {
            printf("Server received message from client %d: %s\n", client_id, mem);
        memset(mem, 0, SHARED_MEM_SIZE);
        }
 
    pthread_mutex_unlock(&mutex[client_id]);    
 
        sleep(1);
    }
    return NULL;
}
 
 
int main(int argc, char *argv[]) {
    if (argc < 2)
    ERROR_EXIT("Usage : ./server name\n");
 
    char *pid_str = argv[1];
    pthread_t threads[MAX_CLIENTS];
    int client_ids[MAX_CLIENTS];
    
    
    for (int i = 0; i < MAX_CLIENTS; i++) {
        char id_str[10];
        sprintf(id_str, "%d", i);
        char *mem_name = strcat(pid_str, id_str);
        int fd = shm_open(mem_name, O_CREAT | O_RDWR, 0666);
        ftruncate(fd, SHARED_MEM_SIZE);
        shared_mem[i] = mmap(NULL, SHARED_MEM_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
        client_ids[i] = i;
    if (pthread_mutex_init(&mutex[i], NULL) != 0)
        ERROR_EXIT("initialize mutex");
        pthread_create(&threads[i], NULL, process_client, &client_ids[i]);
    }
    
for (int i = 0; i < MAX_CLIENTS; i++) {
    pthread_join(threads[i], NULL);
}
 
 
for (int i = 0; i < MAX_CLIENTS; i++) {
    pthread_mutex_destroy(&mutex[i]);
    munmap(shared_mem[i], SHARED_MEM_SIZE);
    char id_str[10];
    sprintf(id_str, "%d", i);
    char *mem_name = strcat(pid_str, id_str);
    shm_unlink(mem_name);
}
 
    exit(EXIT_SUCCESS);
}