[Linux]Timer-定时器

最新推荐文章于 2025-06-09 14:27:50 发布

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最新推荐文章于 2025-06-09 14:27:50 发布 · 281 阅读

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一、timer_create() + timer_settime()定时器

精确到nsec级.

1.1 main.cpp

#include <stdio.h>
#include <signal.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include<sys/time.h>

#define TIMER_SIVAL 9006

#define TIMER_START_TIME 3
#define TIMER_LOOP_TIME 1

struct timeval g_tv;
struct timezone g_tz;

void timer_thread(union sigval v)
{
    struct timeval tv;
    struct timezone tz;
    gettimeofday (&tv , &tz);
    printf("[sival:%d]sec:%ld,usec:%ld\n",v.sival_int,(tv.tv_sec - g_tv.tv_sec),(tv.tv_usec - g_tv.tv_usec));

}

int main()
{

    timer_t timerid;
    struct sigevent evp;
    memset(&evp, 0, sizeof(struct sigevent));       //清零初始化 

    evp.sigev_value.sival_int = TIMER_SIVAL;        //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(CL