在编写程序时,我们经常会用到定时器。首先看看select函数原型如下: int select(int nfds, fd_set *readfds, fd_set *writefds,
int select(int nfds, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds, struct timeval *timeout);
struct timeval{
long tv_sec;
}
void seconds_sleep(unsigned seconds){
struct timeval tv;
tv.tv_sec=seconds;
tv.tv_usec=0;
int err;
do{
err=select(0,NULL,NULL,NULL,&tv);
}while(err<0 && errno==EINTR);
}
void milliseconds_sleep(unsigned long mSec){
struct timeval tv;
tv.tv_sec=mSec/1000;
tv.tv_usec=(mSec%1000)*1000;
int err;
do{
err=select(0,NULL,NULL,NULL,&tv);
}while(err<0 && errno==EINTR);
}
void microseconds_sleep(unsigned long uSec){
struct timeval tv;
tv.tv_sec=uSec/1000000;
tv.tv_usec=uSec%1000000;
int err;
do{
err=select(0,NULL,NULL,NULL,&tv);
}while(err<0 && errno==EINTR);
}
#include <stdio.h>
#include <sys/time.h>
#include <errno.h>
int main()
{
int i;
for(i=0;i<5;++i){
printf("%dn",i);
//seconds_sleep(1);
//milliseconds_sleep(1500);
microseconds_sleep(1900000);
}
}
--结束END--
本文标题: linux使用select实现精确定时器详解
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