130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
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#ifndef STOPWATCH_H
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#define STOPWATCH_H
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#include <sys/time.h>
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#include <cstdlib>
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#include <cmath>
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/**
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\brief timing utility
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This class can take times, up to microseconds exact
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*/
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class stopwatch {
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/**
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time at last start call
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*/
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timeval starttime;
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/**
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time at last stop call
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*/
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timeval stoptime;
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/**
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to accumulate time intervals, previous interval seconds are saved
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*/
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long int offset_sec;
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/**
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to accumulate time intervals, previous interval microseconds are saved
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*/
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long int offset_usec;
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/**
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shift elapsed time to offset register and save new start time
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*/
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void elapsed_save() const {
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/* if timer is already stoped, do nothing */
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if (timerisset(&starttime)) {
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stopwatch* noconst_this=(stopwatch*)this;
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gettimeofday(&(noconst_this->stoptime),NULL);
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/* elapsed time added to internal pointer */
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noconst_this->offset_sec+=(stoptime.tv_sec-starttime.tv_sec);
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noconst_this->offset_usec+=(stoptime.tv_usec-starttime.tv_usec);
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noconst_this->starttime.tv_sec=stoptime.tv_sec;
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noconst_this->starttime.tv_usec=stoptime.tv_usec;
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while (offset_usec<0) {
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noconst_this->offset_usec+=1000000;
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noconst_this->offset_sec-=1;
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}
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while (offset_usec>=1000000) {
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noconst_this->offset_usec-=1000000;
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noconst_this->offset_sec+=1;
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}
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}
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}
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public:
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/**
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creates stopwatch, stopped state, 0 time offset
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*/
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stopwatch() {
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timerclear(&starttime);
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offset_sec=offset_usec=0;
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}
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/**
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creates stopwatch, stopped state, with time offset from double argument
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*/
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stopwatch(const double& offset) {
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timerclear(&starttime);
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offset_sec=(long int)floor(offset);
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offset_usec=(long int)(1.0e6*(offset-offset_sec));
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}
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/**
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creates stopwatch, stopped state, with time offset in seconds and microseconds
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*/
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stopwatch(const long int& _offset_sec, const long int& _offset_usec) {
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timerclear(&starttime);
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offset_sec=_offset_sec;
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offset_usec=_offset_usec;
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}
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stopwatch(const stopwatch& orig) {
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starttime.tv_sec=orig.starttime.tv_sec;
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starttime.tv_usec=orig.starttime.tv_usec;
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offset_sec=orig.offset_sec;
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offset_usec=orig.offset_usec;
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}
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/**
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set timer to zero and start measurement
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*/
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inline void start() {
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gettimeofday(&starttime,NULL);
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offset_sec=offset_usec=0;
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}
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/**
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stop or pause time measurement
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*/
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inline void stop() {
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elapsed_save();
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/* and clear this pointer */
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timerclear(&starttime);
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}
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/**
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continue time measurement
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*/
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inline void cont() {
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if (!timerisset(&starttime)) gettimeofday(&starttime,NULL);
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}
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inline double elapsed() const {
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elapsed_save();
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return (1.0e-6*(double)offset_usec)+(double)offset_sec;
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}
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inline void elapsed(long int& sec, long int& usec) const {
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elapsed_save();
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sec=offset_sec;
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usec=offset_usec;
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}
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};
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#endif /* STOPWATCH_H */
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