counter 中断 用互斥锁可以实现几个线程定时执行

#include
#include
#include
#include
#include
int count = 0;
void set_timer()
{
        struct itimerval itv, oldtv;
        itv.it_interval.tv_sec = 0;
        itv.it_interval.tv_usec = 1000;
        itv.it_value.tv_sec = 0;
        itv.it_value.tv_usec = 1000;
        setitimer(ITIMER_REAL, &itv, &oldtv);
}
void sigalrm_handler(int sig)
{
        count++;
}
int main( )
{
        signal(SIGALRM, sigalrm_handler);
        set_timer();
        while(count < 10000){
        }
        printf("count  = %d\n", count);
        exit(0);
}

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/johnping/archive/2008/02/28/2129757.aspx