c++ - 带定时器和信号的多线程程序

Question

我是多线程编程的新手，所以这个问题可能看起来有点傻，下面是我的代码，我正在尝试拥有 2 个线程:

struct sigaction    S1,S2;
struct itimerval    T1,T2;

void Function1(){
    cout<<"Function1 "<<endl;
}   
void Function2(){
    cout<<"Function2 "<<endl;
} 

void Thread_Function(){
    int t=70000;
    memset (&s2, 0, sizeof (s2));
    s2.sa_handler = &Function2;

    sigaction (SIGALRM, &s2, NULL);

    sigemptyset(&s2.sa_mask);
    s2.sa_flags = 0;

    T2.it_value.tv_sec = 0;
    T2.it_value.tv_usec =t;
    T2.it_interval.tv_sec =0;
    T2.it_interval.tv_usec =t;
    setitimer (ITIMER_REAL, &T2, NULL);
} 

int main(){

    int t=50000;
    memset (&s1, 0, sizeof (s1));
    s1.sa_handler = &Function1;

    sigaction (SIGALRM, &s1, NULL);

    sigemptyset(&s1.sa_mask);
    s1.sa_flags = 0;

    T1.it_value.tv_sec = 0;
    T1.it_value.tv_usec =t;
    T1.it_interval.tv_sec =0;
    T1.it_interval.tv_usec =t;
    setitimer (ITIMER_REAL, &T1, NULL);

    thread t1(Thread_Function);        
}

问题是 Function1 没有执行，换句话说，我在输出中看不到 Function1

Answer 1

来自 the setitimer manual page

A process has only one of each of the three types of timers.

您正试图拥有两个相同类型的计时器，这是不可能的。

如果您想拥有多个计时器，则需要另一种解决方案。