linux 内核/用户空间获取时间

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);