actube/src/cw/cw_clock_lap.c

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#include "timer.h"
/**
* Get lap time. (stop watch)
* @param tv pointer to a clock variable defined with #CW_CLOCK_DEFINE
* @return lap time in seconds.
*/
double cw_clock_lap(struct timeval *tv)
{
struct timeval lap;
gettimeofday(&lap, NULL);
return (cw_timevaltodouble(&lap) - cw_timevaltodouble(tv)) / 1000000.0;
}