AM4379: posix定时器不同平台运行问题

timer1.c

#include <stdio.h> 
#include <signal.h> 
#include <time.h> 
#include <string.h> 
#include <stdlib.h> 
#include <unistd.h>
void timer_thread(union sigval v) 
{printf("timer[CLOCK_MONOTONIC] function! %d\n", v.sival_int); 
}
int main() 
{timer_t timerid;struct sigevent evp;memset(&evp, 0, sizeof(struct sigevent));//清零初始化evp.sigev_value.sival_int = 111;//也是标识定时器的，回调函数可以获得evp.sigev_notify = SIGEV_THREAD;//线程通知的方式，派驻新线程evp.sigev_notify_function = timer_thread;//线程函数地址if (timer_create(CLOCK_MONOTONIC, &evp, &timerid) == -1){perror("fail to timer_create");exit(-1);}/* 第一次间隔it.it_value这么长,以后每次都是it.it_interval这么长,就是说it.it_value变0的时候会>装载it.it_interval的值 */struct itimerspec it;it.it_interval.tv_sec = 1;  // 回调函数执行频率为1s运行1次it.it_interval.tv_nsec = 0;it.it_value.tv_sec = 1;// 倒计时3秒开始调用回调函数it.it_value.tv_nsec = 0;if (timer_settime(timerid, 0, &it, NULL) == -1){perror("fail to timer_settime");exit(-1);}//pause();while (1);return 0; 
}