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12d9e1e128
It now works most excellently across all supported operating sytsems (earlier it didn't work on NT and XNU). Demo code is available in examples/clock.c and this change also adds some of the newer ANSI C time functions like timespec_get(), plus timespec_getres() which hasn't even come out yet as it's C23
41 lines
1.6 KiB
C
41 lines
1.6 KiB
C
#if 0
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/*─────────────────────────────────────────────────────────────────╗
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│ To the extent possible under law, Justine Tunney has waived │
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│ all copyright and related or neighboring rights to this file, │
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│ as it is written in the following disclaimers: │
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│ • http://unlicense.org/ │
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│ • http://creativecommons.org/publicdomain/zero/1.0/ │
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╚─────────────────────────────────────────────────────────────────*/
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#endif
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#include "libc/calls/struct/timespec.h"
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#include "libc/stdio/stdio.h"
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#include "libc/time/time.h"
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/**
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* @fileoverview clock() function demo
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*/
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int main(int argc, char *argv[]) {
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unsigned long i;
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volatile unsigned long x;
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struct timespec now, start, next, interval;
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printf("hammering the cpu...\n");
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next = start = _timespec_mono();
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interval = _timespec_frommillis(500);
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next = _timespec_add(next, interval);
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for (;;) {
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for (i = 0;; ++i) {
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x *= 7;
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if (!(i % 256)) {
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now = _timespec_mono();
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if (_timespec_gte(now, next)) {
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break;
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}
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}
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}
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next = _timespec_add(next, interval);
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printf("consumed %10g seconds monotonic time and %10g seconds cpu time\n",
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_timespec_tonanos(_timespec_sub(now, start)) / 1000000000.,
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(double)clock() / CLOCKS_PER_SEC);
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}
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}
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