eseFacilissimo2

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/sem.h>
#include <sys/ipc.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <pthread.h>
#include <fcntl.h>
#include <string.h>

static FILE* sfile;

pthread_mutex_t mutex;

void* funzione(void* args)
{

    char* frase="frase1";
    fprintf(sfile, "%s", frase);
    pthread_mutex_unlock(&mutex);
    printf("%s by funzione1\n", frase);
    sleep(1);
    exit(0);
}

void* funzione_b(void* args)
{

    char* frase_b= "frase2";
    pthread_mutex_lock(&mutex);
    fprintf(sfile, "%s", frase_b);
    //fflush(sfile);
    pthread_mutex_unlock(&mutex);

    printf("%s by funzione_b\n", frase_b);
    exit(0);
}

int main()
{
    void* res;
    pthread_mutex_init(&mutex, NULL);
    pthread_mutex_lock(&mutex);
    sfile=fopen("sincro2.txt", "w+");

    pthread_t ta;
    pthread_t tb;
    pthread_create(&ta, NULL, funzione, NULL);
    pthread_create(&tb, NULL, funzione_b, NULL);

    pthread_join(ta, &res);
    pthread_join(tb, &res);

    fclose(sfile);
    return 0;

}