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LINUX 几种常用的延时方式会被信号以及中断打断，如果不对打断进行处理会导致延时时间不精确。

select

void ms_sleep(long lTime){    struct timeval sTime;    sTime.tv_sec    = lTime/1000;    sTime.tv_usec   = (lTime%1000)*1000;    while (select(0, NULL, NULL, NULL, &sTime)<0)     {        if(EINTR != errno)       {          perror("my_mSleep nanosleep");          break;       }    }}

关于select被打断返回剩余时间网上没有太多的介绍，在man里面有这样一句话

(ii) select() may update the timeout argument to indicate how much time was left. pselect() does not change this argument.

nanosleep

void ms_sleep(long lTime){    struct timespec sTime;    sTime.tv_sec = lTime / 1000;    sTime.tv_nsec = (lTime % 1000) * 1000000;    while (nanosleep(&sTime, &sTime)<0)    {         if(EINTR != errno)         {            perror("my_mSleep nanosleep");            break;         }    }}void us_sleep(long lTime){    struct timespec sTime;    sTime.tv_sec = lTime / 1000;    sTime.tv_nsec = (lTime % 1000000) * 1000;    while (nanosleep(&sTime, &sTime)<0)    {         if(EINTR != errno)         {            perror("my_mSleep nanosleep");            break;         }    }}

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