我想使用it_interval
ofnewValue
来设置超时的间隔。
但在我的示例中,我只能打印timeout
一次。
发生了什么?如何设置间隔?
这是我的代码:
int main()
{
int efd =epoll_create(256);
setnonblock(efd);
struct epoll_event ev,events[256];
int tfd;//timer fd
if((tfd= timerfd_create(CLOCK_MONOTONIC,TFD_NONBLOCK)) < 0)
cout<<"timerfd create error"<<endl;
struct itimerspec newValue;
struct itimerspec oldValue;
bzero(&newValue,sizeof(newValue));
bzero(&oldValue,sizeof(oldValue));
struct timespec ts;
ts.tv_sec = 5;
ts.tv_nsec = 0;
//both interval and value have been set
newValue.it_value = ts;
newValue.it_interval = ts;
if( timerfd_settime(tfd,0,&newValue,&oldValue) <0)
{
cout<<"settime error"<<strerror(errno)<<endl;
}
ev.data.fd = tfd;
ev.events = EPOLLIN | EPOLLET;
if( epoll_ctl(efd,EPOLL_CTL_ADD,tfd,&ev) < 0)
cout<<"epoll_ctl error"<<endl;
int num = 0;
while(1)
{
if((num=epoll_wait(efd,events,256,1000)) > 0)
{//justice
for(int i=0;i<num;i++)
{
if(events[i].data.fd == tfd)
{
cout<<"timeout"<<endl;
}
}
}
}
return 0;
}