linux下时间的转换 timeval /time_t time_t/tm
2014-04-26 23:46
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#include <stdio.h>
#include <stdlib.h>
//#include <sys/types.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
int main (int argc, char *argv[])
{
struct timeval t_startrun, t_endrun;
int flag = 0;
char timef[100];
time_t t;
struct tm *today;
for( int i = 0 ; i < 1000 ; i++ )
{
gettimeofday(&t_startrun, 0 );
usleep(1000000);
gettimeofday(&t_endrun, 0);
//printf("The program's running time is %ld ms! ",100);
//printf("The program's running time is ms!");
//(( t_endrun.tv_sec - t_startrun.tv_sec)*100000 + t_endrun.tv_usec - t_startrun.tv_usec) / 1000 );
long ltime = (( t_endrun.tv_sec - t_startrun.tv_sec)*1000000 + t_endrun.tv_usec - t_startrun.tv_usec) / 1000 ;
if( ltime < 0 )
{
printf("t_endrun.tv_sec = %d - t_startrun.tv_sec = %d,"
"t_endrun.tv_usec = %d - t_startrun.tv_usec = %d/r/n",
t_endrun.tv_sec , t_startrun.tv_sec,
t_endrun.tv_usec , t_startrun.tv_usec);
}
t = t_endrun.tv_sec;
today = localtime(&t);
strftime(timef,100, "%Y-%m-%d %H:%M:%S ",today);
printf( "%d-%d,%d,%s/r/n ",t_endrun.tv_sec,t_endrun.tv_usec,t,timef);
printf("The program's running time is %ld ms!/r/n ",ltime);
fflush(stdout);
}
return 0;
}
#include <stdlib.h>
//#include <sys/types.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
int main (int argc, char *argv[])
{
struct timeval t_startrun, t_endrun;
int flag = 0;
char timef[100];
time_t t;
struct tm *today;
for( int i = 0 ; i < 1000 ; i++ )
{
gettimeofday(&t_startrun, 0 );
usleep(1000000);
gettimeofday(&t_endrun, 0);
//printf("The program's running time is %ld ms! ",100);
//printf("The program's running time is ms!");
//(( t_endrun.tv_sec - t_startrun.tv_sec)*100000 + t_endrun.tv_usec - t_startrun.tv_usec) / 1000 );
long ltime = (( t_endrun.tv_sec - t_startrun.tv_sec)*1000000 + t_endrun.tv_usec - t_startrun.tv_usec) / 1000 ;
if( ltime < 0 )
{
printf("t_endrun.tv_sec = %d - t_startrun.tv_sec = %d,"
"t_endrun.tv_usec = %d - t_startrun.tv_usec = %d/r/n",
t_endrun.tv_sec , t_startrun.tv_sec,
t_endrun.tv_usec , t_startrun.tv_usec);
}
t = t_endrun.tv_sec;
today = localtime(&t);
strftime(timef,100, "%Y-%m-%d %H:%M:%S ",today);
printf( "%d-%d,%d,%s/r/n ",t_endrun.tv_sec,t_endrun.tv_usec,t,timef);
printf("The program's running time is %ld ms!/r/n ",ltime);
fflush(stdout);
}
return 0;
}
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