linux 内核/用户空间获取时间

来源：互联网发布：酷狗铃声制作专家 mac 编辑：程序博客网时间：2024/05/01 01:56

1、内核空间

　#include<time.h>

    struct timeval stime,etime;
   do_gettimeofday(&stime);
　...　...　...　...　...
   lsmfts_set_targe_focal(priv->lsMfts,focalLength);   //设置targe focla值 focalvalue[0,100]
   do_gettimeofday(&etime);
   printk("----do_gettimeofday----of setFoccalLength_od time %d us----\n",(etime.tv_sec - stime.tv_sec)*1000000 + (etime.tv_usec - stime.tv_usec)); //即为时间差
   return 0;

2、用户空间

　#include <time.h>
　#include <sys/time.h>

　typedef unsigned long long guint64;

　guint64 system_current_time_millis()
　 {
   　 struct timeval tve;
    　gettimeofday(&tve,NULL);
    　guint64 sec=tve.tv_sec;
    　guint64 microseconds=tve.tv_usec;
    　guint64 total=sec*G_GINT64_CONSTANT(1000)+microseconds/G_GINT64_CONSTANT(1000);
    　return total;
　 }

　guint64 system_current_time_nano()
　{
    　struct timeval tve;
    　gettimeofday(&tve,NULL);
   　 guint64 sec=tve.tv_sec;
    　guint64 microseconds=tve.tv_usec;
    　guint64 total=sec*G_GINT64_CONSTANT(1000*1000*1000)+microseconds*G_GINT64_CONSTANT(1000);
    　return total;
　}

　guint64 system_current_time_micro()
　{
    　struct timeval tve;
   　 gettimeofday(&tve,NULL);
    　guint64 sec=tve.tv_sec;
    　guint64 microseconds=tve.tv_usec;
    　guint64 total=sec*G_GINT64_CONSTANT(1000*1000)+microseconds;
    　return total;
　}

　guint64 time1= system_current_time_millis();
   ...　...　...　...　...
   guint64 time2= system_current_time_millis();
   printf("----system_current_time_micro:%llums-%llums = %llu ms----\n", time2,time1,time2-time1);

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