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52 lines
1.5 KiB
52 lines
1.5 KiB
#ifndef _NSEC_TIMER_H
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#define _NSEC_TIMER_H
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#include <time.h> // clock_gettime, CLOCK_MONOTONIC
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#include <stdint.h>
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#include <string>
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#include <sstream>
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namespace glim {
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//! Safe nanoseconds timer.
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struct NsecTimer {
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timespec start;
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NsecTimer () {restart();}
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//! Nanoseconds since the creation or restart of the timer.
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int64_t operator()() const {
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timespec nsecStop; clock_gettime (CLOCK_MONOTONIC, &nsecStop);
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return (int64_t) (nsecStop.tv_sec - start.tv_sec) * 1000000000LL + (int64_t) (nsecStop.tv_nsec - start.tv_nsec);
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}
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/** Seconds since the creation or restart of the timer. */
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double sec() const {
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timespec nsecStop; clock_gettime (CLOCK_MONOTONIC, &nsecStop);
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double seconds = nsecStop.tv_sec - start.tv_sec;
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seconds += (double)(nsecStop.tv_nsec - start.tv_nsec) / 1000000000.0;
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return seconds;
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}
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//! Seconds since the creation or restart of the timer.
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std::string seconds (int precision = 9) const {
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// The trick is to avoid the scientific notation by printing integers.
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double sec = this->sec();
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std::ostringstream buf;
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int isec = (int) sec;
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buf << isec;
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sec -= isec;
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for (int pc = precision; pc; --pc) sec *= 10.0;
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int ifrac = (int) sec;
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if (ifrac > 0) {
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buf << '.';
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buf.fill ('0'); buf.width (precision);
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buf << ifrac;
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}
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return buf.str();
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}
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void restart() {clock_gettime (CLOCK_MONOTONIC, &start);}
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int64_t getAndRestart() {int64_t tmp = operator()(); restart(); return tmp;}
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};
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}
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#endif // _NSEC_TIMER_H
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