关于 c:POSIX 计时器在运行几次后挂断

#define CLOCKID CLOCK_REALTIME
#define SIG SIGUSR1
int ret;
timer_t timerid;
struct sigevent sev;
struct itimerspec its;
long long freq_nanosecs;
sigset_t mask;
struct sigaction sa;

sem_t sem[NUM_THREADS];
sem_t mute;

pthread_t tid[NUM_THREADS];
int state = 0;

static void handler(int sig, siginfo_t *si, void *uc)
{
    ret = sem_post(&sem[(state+1)%NUM_THREADS]);
        if (ret)
        {
            printf("Error in Sem Post/
");
        }
        state++;
}

void *threadA(void *data_)
{  
    int i = 0, s,n,value;

    long int loopNum;
    int turn = (intptr_t)data_;
    struct timespec tval_result,tval_result2;

    int sid = syscall(SYS_gettid);
    FILE *fp;
    fp=fopen("ipc.out","a");    
    fprintf(fp,"thread_%d %d/
",turn,sid);  
    fclose(fp);

    int counter=0;

    while(1)
    {
        ret = sem_wait(&sem[turn]);
        if (ret)
        {
            printf("Error in Sem Post/
");
        }
        //printf("Thread # -> %d/
",turn);

        its.it_value.tv_sec = 0;
        its.it_value.tv_nsec = 14000;
        its.it_interval.tv_sec = 0;
        its.it_interval.tv_nsec = 0;

        ret = timer_settime(timerid, 0, &its, NULL);
        if ( ret < 0 )
            perror("timer_settime");

        // Some heavy work

    counter++;

    if(counter==100)
    break;
    }
    printf("finished %d/
",turn);

}

int main(int argc, char *argv[])
{
    int data = 0;
    int err,i;

    sa.sa_flags = SA_RESTART;
    sa.sa_sigaction = handler;
    sigemptyset(&sa.sa_mask);
    sigaction(SIG, &sa, NULL);

    sev.sigev_notify = SIGEV_SIGNAL;
    sev.sigev_signo = SIG;
    sev.sigev_value.sival_ptr = &timerid;
    ret = timer_create(CLOCKID, &sev, &timerid);
    if ( ret < 0 )
        perror("timer_create");

    sem_init(&sem[0], 0, 1);
    for ( i = 1; i < NUM_THREADS; ++i)
        {
            sem_init(&sem[i], 0, 0);
        }

    while(data < NUM_THREADS)
    {
        //create our threads
        err = pthread_create(&tid[data], NULL, threadA, (void *)(intptr_t)data);
        if(err != 0)
            printf("/
can’t create thread :[%s]", strerror(err));

        data++;
    }

    pthread_exit(NULL);
}