66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
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#include <stdint.h>
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#if defined(__APPLE__)
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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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#else // __linux
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# include <time.h>
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# ifndef CLOCK_MONOTONIC //_RAW
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# define CLOCK_MONOTONIC CLOCK_REALTIME
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# endif
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#endif
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static
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uint64_t nanotimer() {
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static int ever = 0;
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#if defined(__APPLE__)
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static mach_timebase_info_data_t frequency;
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if (!ever) {
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if (mach_timebase_info(&frequency) != KERN_SUCCESS) {
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return 0;
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}
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ever = 1;
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}
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return;
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#elif defined(_WIN32)
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static LARGE_INTEGER frequency;
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if (!ever) {
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QueryPerformanceFrequency(&frequency);
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ever = 1;
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}
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LARGE_INTEGER t;
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QueryPerformanceCounter(&t);
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return (t.QuadPart * (uint64_t) 1e9) / frequency.QuadPart;
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#else // __linux
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struct timespec t;
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if (!ever) {
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if (clock_gettime(CLOCK_MONOTONIC, &t) != 0) {
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return 0;
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}
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ever = 1;
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}
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clock_gettime(CLOCK_MONOTONIC, &t);
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return (t.tv_sec * (uint64_t) 1e9) + t.tv_nsec;
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#endif
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}
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static double now() {
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static uint64_t epoch = 0;
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if (!epoch) {
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epoch = nanotimer();
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}
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return (nanotimer() - epoch) / 1e9;
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}
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double calcElapsed(double start, double end) {
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double took = -start;
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return took + end;
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} |