struct timeval, 시간 측정
gcc 3.4.5 (mingw), Windows XP
invalid-file#include <sys/time.h> // may be different according to Platform
struct timeval calcConsumedTime(struct timeval z_stStartTime, struct timeval z_stEndTime)
{
struct timeval z_stConsumedTime;
z_stConsumedTime.tv_sec = z_stEndTime.tv_sec - z_stStartTime.tv_sec;
z_stConsumedTime.tv_usec = z_stEndTime.tv_usec - z_stStartTime.tv_usec;
if ( z_stConsumedTime.tv_usec < 0 )
{
z_stConsumedTime.tv_sec -= 1;
z_stConsumedTime.tv_usec = (z_stEndTime.tv_usec - z_stStartTime.tv_usec + 1000000);
}
return z_stConsumedTime;
} // end of function calcConsumedTime()
int main()
{
int i;
struct timeval z_stStartTime, z_stEndTime, z_stConsumedTime;
// write start time
if ( gettimeofday(&z_stStartTime, (void*)NULL) == -1 )
{
printf("time variable initialization error\n");
return -1;
}
for ( i = 0; i < 10000000; ++i )
;
// write end time
if ( gettimeofday(&z_stEndTime, (void*)NULL) == -1 )
{
printf("time variable initialization error\n");
return -1;
}
printf("function timeCheck() took %ld.%03ld seconds\n", z_stStartTime.tv_sec,
z_stStartTime.tv_usec / 1000); // pay attention to divide 'tv_usec' by 1000
printf("function timeCheck() took %ld.%03ld seconds\n", z_stEndTime.tv_sec,
z_stEndTime.tv_usec / 1000); // pay attention to divide 'tv_usec' by 1000
z_stConsumedTime = calcConsumedTime(z_stStartTime, z_stEndTime);
printf("function timeCheck() took %ld.%03ld seconds\n", z_stConsumedTime.tv_sec,
z_stConsumedTime.tv_usec / 1000); // pay attention to divide 'tv_usec' by 1000
return 0;
} // end of function main()