我是一个Linux新手。我正在尝试使用clock_nanosleep来执行一个简单的任务。问题是,当被信号中断时,clock_nanosleep不会将errno设置为EINTR。我已经尝试重置SA_RESTART标志,但是没有成功。这是我的代码。谢谢。
void signalHandler( int signum )
{
printf("Interrupt signal received.\n");
}
void *periodic_thread (void *param)
{
struct itimerspec its;
struct sigevent sig;
struct timespec next, period;
sigset_t blocked;
siginfo_t si;
timer_t mytimer;
int i, j;
/* create a timer that will be used to periodically send a signal */
sig.sigev_notify = SIGEV_SIGNAL;
sig.sigev_signo = SIGUSR1;
sig.sigev_value.sival_ptr = &sig;
timer_create(CLOCK_REALTIME, &sig, &mytimer);
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = &signalHandler;
sigaction(SIGUSR1, &sa, NULL);
/* set the periodic timer */
its.it_value.tv_sec = 8;
its.it_value.tv_nsec = 00000000;
its.it_interval.tv_sec = 0;
its.it_interval.tv_nsec = 0; ;
period.tv_sec = 5;
period.tv_nsec = 00000000;
timer_settime(mytimer, 0, &its, NULL);
printf("periodic thread started...\n");
j=1;
i = clock_gettime(CLOCK_MONOTONIC, &next);
while(1)
{
next.tv_sec = next.tv_sec + period.tv_sec;
next.tv_nsec = next.tv_nsec + period.tv_nsec;
i = clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, &next, 0);
printf("I am done \n");
if((i == -1) && (errno == EINTR))
break;
}
printf("...periodic thread end!\n");
timer_delete(mytimer);
return NULL;
}
int main()
{
pthread_t mythread;
pthread_attr_t myattr;
//struct sched_param myparam;
void *returnvalue;
sigset_t blocked;
/* initializes the thread attribute */
pthread_attr_init(&myattr);
printf("starting a periodic thread...\n");
pthread_create(&mythread, &myattr, periodic_thread, NULL);
pthread_attr_destroy(&myattr);
/* wait the end of the thread we just created */
pthread_join(mythread, &returnvalue);
printf("ending main...\n");
return 0;
}
输出>>
starting a periodic thread...
periodic thread started...
I am done
Interrupt signal received.
I am done
I am done
continues.. (Does not break the while(1))
pthread_create()
传递空指针),因为您未设置任何非默认属性。 - Jonathan Leffler