64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
#pragma once
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//
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// From: http://roxlu.com/2014/047/high-resolution-timer-function-in-c-c--
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/* ----------------------------------------------------------------------- */
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/*
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Easy embeddable cross-platform high resolution timer function. For each
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platform we select the high resolution timer. You can call the 'ns()'
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function in your file after embedding this.
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*/
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#include <stdint.h>
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#if defined(__linux)
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# define HAVE_POSIX_TIMER
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# include <time.h>
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# ifdef CLOCK_MONOTONIC
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# define CLOCKID CLOCK_MONOTONIC
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# else
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# define CLOCKID CLOCK_REALTIME
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# endif
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#elif defined(__APPLE__)
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# define HAVE_MACH_TIMER
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# include <mach/mach_time.h>
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#elif defined(_WIN32)
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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#endif
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static uint64_t ns_clock()
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{
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static uint64_t is_init = 0;
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#if defined(__APPLE__)
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static mach_timebase_info_data_t info;
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if (0 == is_init)
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{
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mach_timebase_info(&info);
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is_init = 1;
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}
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uint64_t now;
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now = mach_absolute_time();
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now *= info.numer;
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now /= info.denom;
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return now;
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#elif defined(__linux)
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static struct timespec linux_rate;
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if (0 == is_init)
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{
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clock_getres(CLOCKID, &linux_rate);
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is_init = 1;
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}
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uint64_t now;
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struct timespec spec;
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clock_gettime(CLOCKID, &spec);
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now = spec.tv_sec * 1.0e9 + spec.tv_nsec;
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return now;
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#elif defined(_WIN32)
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static LARGE_INTEGER win_frequency;
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if (0 == is_init)
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{
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QueryPerformanceFrequency(&win_frequency);
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is_init = 1;
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}
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LARGE_INTEGER now;
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QueryPerformanceCounter(&now);
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return (uint64_t)((1e9 * now.QuadPart) / win_frequency.QuadPart);
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#endif
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} |